Choerorrhinodes constricticeps, Zimmerman, 1942Choerorrhinodes marshalli, Zimmerman, Elwood C., 1942Choerorrhinodes flavisetosus, Zimmerman, Elwood C., 1942

Zimmerman, Elwood C., 1942, Curculionidae of Guam, Insects of Guam-I, Honolulu, Hawaii: Bernice P. Bishop Museum, pp. 73-146 : 121-125

Genus CHOERORRHINODES Champion, 1914

This genus was erected by Champion (Linn. Soc. London, Trans., Zool. II, 16:458, 1914) to receive a new species (genotype C. tenuiculus ) from the Seychelles. It has remained monotypic until now. Three Guam species are described here as new and assigned to the genus. It is with some diffidence, however, that I place all three species in the genus because of their structural differences, some of which may necessitate their removal from the genus when our knowledge of the Cossoninae is more complete and the genera more adequately studied and defined. This extreme discontinuous distribution will, I believe, surely be reduced when collections from intervening areas are studied. I have, unfortunately, not seen a specimen of the genotype which was described from a unique, but Sir Guy Marshall has kindly compared my specimens with it.

KEY 'l'O THE SPECIES OF' CHOERORRHINODES OF' GUAM

1. Dorsal setae very conspicuous, coarse, golden yellow; head not constricted behind eyes..........................................................................32. C. flavisetosus Zimmerman.

Dorsal setae inconspicuous, fine, usually rather minute; head constricted at least at the sides behind eyes............................................................................................ 2

2. Post-ocular constriction deeply and prominently continued across top of head TODO TODO TODO TODO

Post-ocular constriction feebly impressed on the sides only and not at all continued across dorsum............................................................31. C. marshalli Zimmerman.

30. Choerorrhinodes constricticeps , new species (pl. 4, A).

Female. Derm rather dull to moderately shiny, reddish brown, piceous to black; setae minute and pale.

Head strongly constricted at less than length of an eye behind eyes, the constriction continued prominently across dorsum, area behind constriction reticulate but impunctate, the lobed area between constriction and eyes coarsely and densely punctate as interocular area; interocular area twice as broad as breadth of an eye when viewed from above, coarsely, densely, subconfluently, continuously punctate with base of rostrum; eyes separated from prothorax by one and one half to two times their length. Rostrum almost continuous in longitudinal dorsal outline with interocular area, about three fifths or two" 'thirds as long as pronotum, slightly more than twice as long as broad, slightly and evenly narrowed laterally from base to antennae, thence evenly and slightly expanded to apex, apex about one fourth broader than narrowest post antenna! breadth, antennae inserted slightly but distinctly behind middle, apex of scrobe marked by a raised line below hind margin of eye; longitudinal dorsal outline gently arcuate; densely punctate behind antennae, punctures tending to be longitudinally confluent, more finely punctate beyond antennae, coarsely reticulate; setae sparse, minute. Antennae with scape reaching hind margin of eye; funicular segment 1 about one fourth broader and twice as long as 2, 2 about as broad as long and longer than 3, 3-5 successively slightly more transverse; club stout, ovate, slightly longer than three preceding segments. Prothorax one fifth to almost one third longer than broad; base subtruncate, arcuate on sides from base to near subapical constriction, broadest at or behind middle, subapical constriction prominent, slightly impressed across dorsum which is otherwise almost straight and flat longitudinally; disk flattened, densely and coarsely punctate, punctures subhexagonal, their interstices irregular and much narrower than their diameters; setae minute. Elytra two and one half times as long as broad, twice as long as prothorax, base subtruncate, subparallel-sided in basal two thirds, thence narrowed to the bluntly rounded apex; striae deep and coarse; their punctures coarse and close, as broad or broader than intervals, lateral stria terminating at metacoxa, setae minute and inconspicuous; intervals convex, their sides crenulated by strial punctures, each bearing a row of small, fine, decumbent setae, punctate, coarsely reticulate, the ninth costiform above last three ventrites. Legs with tibial unci and teeth at inner apical angles well developed; third tarsal segment deeply bilobed. Sternum coarsely, densely punctate throughout; intercoxal process of prosternum about as broad as a coxa, distance between coxal cavity and fore margin of prosternum twice that of distance behind coxal cavity; mesocoxae separated by more than breadth of a coxa; metasternum between mid and hind coxae three times as long as breadth of a mesocoxa, metacoxae separated by slightly less than the transverse diameter of a metacoxa. Venter with first two segments coarsely and densely punctate as metasternum; ventrites 3 and 4 punctate along base; ventrite 5 shallowly concave, distinctly punctate along basal margin, indistinctly so elsewhere; finely, sparsely setose. Length, 2-2.25 mm.; breadth, 0.5-0.6 mm.

Holotype female collected at Tarague, May 17, 1936 and one female paratype swept from grass at same time and place, Swezey; two paratypes from National Museum material taken from Ochrosia by Oakley, Feb. 9, 1938, no. 741; and four taken by Oakley from dead wood, June 29, 1939, no. 2349. Since the description was written, I have seen another specimen taken from "Chopag nuts" ( Ochrocarpus obovalis ), Feb. 2, 1938, Oakley .

The conspicuously constricted head will serve to distinguish this species from the other Guam members of the genus. It is most closely allied to Choerorrhinodes rnarshalli but it has, in addition to its different cephalic characters, a flattened instead of dorsally convex pronotum upon which the punctures are more angular, irregular, and individually less distinct than on C. marshalli , and the setae on the elytral intervals and in the striae are less dense and less conspicuously developed.

31. Choerorrhinodes marshalli , new species (pl. 4, E).

Derm predominantly dull, coal black, with antennae, apices of tibiae and tarsi reddish; setae white.

Head coarsely reticulate throughout; slightly constricted on sides at a diameter of an eye behind eyes, the constriction not continued across dorsum, area behind constriction, at least in part, punctate; densely, coarsely, reticulately, subconfluently punctate from constriction to rostrum; interocular area slightly depressed, two to almost three times as broad as an eye when viewed from above; eyes quite prominent, separated from prothorax for a distance about equal to twice length of an eye. Rostrum subcontinuous in dorsal profile with the interocular area; outline shallowly concavely continued to crown, about three fifths as long as pronotum, twice as long as broad, subparallel-sided from base to antennae, slightly enlarged there, thence subparallel-sided to apex, apical breadth onlj very slightly greater than narrowest postantennal breadth; coarsely reticulate, coarsely, densely, confluently punctate, finely, longitudinally strigate; antennae inserted at middle in female, slightly behind middle in male, scrobes evanescent behind and without a delimiting carina below base of eye. Antennae with scape not reaching much past middle of eye and not extending to hind margin of eye; funicular segment 1 broader than, and about twice as long as 2, 2 triangular in outline, narrow at base, almost as long as 3 plus 4, 3-5 each successively slightly more transverse; club about as long as or longer than the four preceding segments. Prothora.r only slightly longer than broad, base and apex subtruncate, basolateral angles obtusely rounded in basal fourth, thence almost straight, but slightly arcuately narrowed, to about apical fourth, thence more strongly rounded to feeble subapical constriction, constriction only slightly interrupting dorsal contour which is otherwise distinctly and evenly arcuate longitudinally; coarsely, densely, evenly, re\iculately punctate, discal punctures individually distinct, their interstices less than half as broad as their diameters, individually distinctly and coarsely reticulate; setae minute and inconspicuous. Elytra more than twice as long as broad (6: 2.5), and more than twice as long as prothorax in same proportion, base subtruncate, subparallel-sided in basal two thirds, thence rounded to apex and with a slight subapical constriction; striae deep and coarse, their punctures large and coarse, much broader than intervals, their setae normally quite distinct, the lateral stria terminating at metacoxa; intervals narrow and convex, each bearing a row of fine slanting, conspicuous, closely placed setae, ninth interval rather abruptly costiform beyond apex of second ventrite and joined to third at a distance from elytral apex. Legs with tibial unci very strongly developed, tooth at inner apical angle minute; third tarsal segment deeply bilobed. Sternum coarsely and densely punctate throughout, punctures broader than their interstices; prosternum broadly depressed in middle beyond coxae, intercoxal process slightly narrower than a coxa; metasternum with interstices of punctures shiny, intercoxal process of mesocoxae as broad as a mesocoxa, as long between mid and hind coxae as three times breadth of a mesocoxa; metacoxae separated by two thirds the length of the metasternum between tl1e mid and hind coxae. Venter with the first two ventrites tumid in the female, depressed down middle in male, coarsely and densely punctate as the metasternum, interstices shiny; ventrites 3 and 4 coarsely punctate in their basal half; ventrite 5 coarsely and densely punctate throughout, coarsely reticulate, sparsely setose. Length, 1.6-2.0 mm.; breadth, 0.5-0.6 mm.

Holotype male, Orote Point, Aug. 2, 1936, Swezey (bearing label "on red spider on Ipomoea," in error?); TODO allotype female, same place, May 24, Swezey; one paratype with similar data; one paratype, Piti (on hedge), Oct. 22, Swezey; and one paratype, Agana, May 2, Usinger.

In addition to the characters given under Choerorrhinodes constricticeps for the separation of this species from that, it should be noted that the antenna! scape does not reach to the hind margin of the eye, the scrobes are not delimited behind by a carina below the basal edge of the eye, the crown of the head is at least in-part punctate and the rostrum is longitudinally strigate.

It gives me much pleasure to dedicate this species to Sir Guy MarshaII as an expression of my gratitude and appreciation for his unfailing kindness and cooperation in aiding me in my studies of difficult groups of Curculionidae .

32. Choerorrhinodes flavisetosus , new species (pl. 4, F).

Male: derm dull reddish brown, to black, appendages paler, dorsum piceous; setae conspicuously golden yellow.

Head without a constriction behind eyes, sides evenly arcuate from base to eyes, dorsum strongly convex, coarsely reticulate, almost entirely impunctate and bare from base to a line just back of eyes, thence densely, rather coarsely punctate, the stout golden setae somewhat more condensed along inner margins of eyes and across top of punctate front; interocular area twice as broad as an eye as viewed from above, dorsal outline straightly continuous with that of rostrum; eyes separated from prothorax by only about longitudinal diameter of an eye. Rostrum slightly arcuate below, almost straight, straight above almost to antennae, thence gently arcuate, about three fifths as long as pronotum, hardly narrowed on sides from base to antennae, appearing slightly, rather evenly expanded from base to apex, greatest apical breadth only about one eighth broader than narrowest post-antenna! breadth; coarsely reticulate, puncturation mostly similar to that on interocular area, but becoming shallower and less definite distally, with a few scattered golden setae; antennae inserted at middle but appearing more apically inserted because of scrobe being continued past insertion; scrobes deep and well defined to near fore margin of eyes, evanescent behind and without a posterior delimiting carina. Antennae with scape stout, reaching to hind margin of eye; first funicular segment about one third broader than 2, about as long as 2 plus 3, 2 longer than 3, 3 less bulky than 4 or 5, 3 to 5 successively larger and more transverse; club stoutly oval, as long as four preceding segments. Prothorax as broad as long, broadest at about basal third, strongly rounded on sides, most strongly so in basal third from truncate base to strongly marked subapical constriction, constriction only slightly impressed across otherwise slightly arcuate, somewhat flattened longitudinal dorsal contour; apex slightly, broadly emarginate; coarsely reticulate; disk densely punctate, punctures moderately large, but shallow, their interstices narrower than their diameters; most of punctures bearing coarse, decumbent, medially directed, golden setae. Elytra coarsely reticulate, twice as long as broad, somewhat more than twice as long as prothorax; base subtruncate, subparallel-sided to apical third, thence broadly rounded to apex; striae mostly rather shallow and not sharply margined, narrower than intervals, their punctures comparatively shallow and broader than grooves, bearing minute, hardly discernible setae; outer stria terminating at metacoxa; intervals flat or almost so, punctate, punctures bearing coarse, blunt golden setae, setae very conspicuous, slanting, close set in single rows, about as long as breadth of intervals, with ninth interval becoming more costiform above fourth ventrite and joining third. Legs with femora and tibiae with scattered, decumbent, golden, fine hairlike setae; tibial unci well developed, so formed that their inner margins arise from a point near inner apical angles of tibiae, their inner margins, at least on fore pair, making a continuous concave curve that ends in tooth at inner apical angle, teeth at inner apical angles minute; third tarsal segment deeply bilobed, fourth segment beginning at basal third of third segment. Sternum with prosternum coarsely and densely punctate, interstices narrower than punctures, subapical constriction deeply impressed across apical fourth, distance between fore margin of coxae and apex more than twice that behind coxae, intercoxal process only one third as broad as a coxa; intercoxal process of mesosternum flat, about two thirds as broad as a coxa; metasternum broadly concavely flattened down middle in male, densely, rather coarsely punctured, interstices narrower to almost as broad as punctures, each puncture bearing a decumbent golden seta, median line striaform, impunctate, distance between mid and hind coxae three times length of a metacoxa at trochanter or slightly more than twice as broad as a mesocoxa, metacoxae separated by a distance equal to twice length of a metacoxa at trochanter. Venter with first two ventrites punctate and setose as the metasternum, the first rather deeply and broadly concave in the male; ventrites 3 and 4 finely punctate near fore and hind margins; ventrite 5 densely set with setiferous punctures, convex, but with about apical half semi-circularly impressed and less coarsely punctate. Length, 2.3 mm.; breadth, 0.8 mm.

Holotype male collected at Machanao, June 6, 1936, Usinger.

This species is most distinct from the other species described here because of its conspicuous, golden-yellow setae, less coarsely striated and punctate elytra, non-constricted head, more approximate coxae, different structure of the tibial unci, stouter form and other characters.

When a proper revision of the genera of the Cossoninae is written, or when other revisionary work is done, it might be shown that Choerorrhinodes cannot include this aberrant species, and perhaps a new genus may be erected for it. The non-constricted head, and more particularly the more approximate coxae and the structure of the tibial unci are divergent characters. On the other species of Choerorrhinodes described here, the tibial uncus arises distinctly from the outer apical angle and its inner margin is far removed from the inner apical angle of the tibia and the tibia is more or less straight from the base of the uncus to the tooth at inner apical angle. On this species, however, the uncus, although originating as an extension of the outer tibial margin, is so broad at the base and so curved that it appears to arise from the entire apex itself, rather than from the outer edge, and its inner margin continues on to the base of the tooth at the inner apical angle of the tibia.

30. Choerorrhinodes constricticeps , new species (pl. 4, A).

Female. Derm rather dull to moderately shiny, reddish brown, piceous to black; setae minute and pale.

Head strongly constricted at less than length of an eye behind eyes, the constriction continued prominently across dorsum, area behind constriction reticulate but impunctate, the lobed area between constriction and eyes coarsely and densely punctate as interocular area; interocular area twice as broad as breadth of an eye when viewed from above, coarsely, densely, subconfluently, continuously punctate with base of rostrum; eyes separated from prothorax by one and one half to two times their length. Rostrum almost continuous in longitudinal dorsal outline with interocular area, about three fifths or two" 'thirds as long as pronotum, slightly more than twice as long as broad, slightly and evenly narrowed laterally from base to antennae, thence evenly and slightly expanded to apex, apex about one fourth broader than narrowest post antenna! breadth, antennae inserted slightly but distinctly behind middle, apex of scrobe marked by a raised line below hind margin of eye; longitudinal dorsal outline gently arcuate; densely punctate behind antennae, punctures tending to be longitudinally confluent, more finely punctate beyond antennae, coarsely reticulate; setae sparse, minute. Antennae with scape reaching hind margin of eye; funicular segment 1 about one fourth broader and twice as long as 2, 2 about as broad as long and longer than 3, 3-5 successively slightly more transverse; club stout, ovate, slightly longer than three preceding segments. Prothorax one fifth to almost one third longer than broad; base subtruncate, arcuate on sides from base to near subapical constriction, broadest at or behind middle, subapical constriction prominent, slightly impressed across dorsum which is otherwise almost straight and flat longitudinally; disk flattened, densely and coarsely punctate, punctures subhexagonal, their interstices irregular and much narrower than their diameters; setae minute. Elytra two and one half times as long as broad, twice as long as prothorax, base subtruncate, subparallel-sided in basal two thirds, thence narrowed to the bluntly rounded apex; striae deep and coarse; their punctures coarse and close, as broad or broader than intervals, lateral stria terminating at metacoxa, setae minute and inconspicuous; intervals convex, their sides crenulated by strial punctures, each bearing a row of small, fine, decumbent setae, punctate, coarsely reticulate, the ninth costiform above last three ventrites. Legs with tibial unci and teeth at inner apical angles well developed; third tarsal segment deeply bilobed. Sternum coarsely, densely punctate throughout; intercoxal process of prosternum about as broad as a coxa, distance between coxal cavity and fore margin of prosternum twice that of distance behind coxal cavity; mesocoxae separated by more than breadth of a coxa; metasternum between mid and hind coxae three times as long as breadth of a mesocoxa, metacoxae separated by slightly less than the transverse diameter of a metacoxa. Venter with first two segments coarsely and densely punctate as metasternum; ventrites 3 and 4 punctate along base; ventrite 5 shallowly concave, distinctly punctate along basal margin, indistinctly so elsewhere; finely, sparsely setose. Length, 2-2.25 mm.; breadth, 0.5-0.6 mm.

Holotype female collected at Tarague, May 17, 1936 and one female paratype swept from grass at same time and place, Swezey; two paratypes from National Museum material taken from Ochrosia by Oakley, Feb. 9, 1938, no. 741; and four taken by Oakley from dead wood, June 29, 1939, no. 2349. Since the description was written, I have seen another specimen taken from "Chopag nuts" ( Ochrocarpus obovalis ), Feb. 2, 1938, Oakley .

The conspicuously constricted head will serve to distinguish this species from the other Guam members of the genus. It is most closely allied to Choerorrhinodes rnarshalli but it has, in addition to its different cephalic characters, a flattened instead of dorsally convex pronotum upon which the punctures are more angular, irregular, and individually less distinct than on C. marshalli , and the setae on the elytral intervals and in the striae are less dense and less conspicuously developed.

31. Choerorrhinodes marshalli , new species (pl. 4, E).

Derm predominantly dull, coal black, with antennae, apices of tibiae and tarsi reddish; setae white.

Head coarsely reticulate throughout; slightly constricted on sides at a diameter of an eye behind eyes, the constriction not continued across dorsum, area behind constriction, at least in part, punctate; densely, coarsely, reticulately, subconfluently punctate from constriction to rostrum; interocular area slightly depressed, two to almost three times as broad as an eye when viewed from above; eyes quite prominent, separated from prothorax for a distance about equal to twice length of an eye. Rostrum subcontinuous in dorsal profile with the interocular area; outline shallowly concavely continued to crown, about three fifths as long as pronotum, twice as long as broad, subparallel-sided from base to antennae, slightly enlarged there, thence subparallel-sided to apex, apical breadth onlj very slightly greater than narrowest postantennal breadth; coarsely reticulate, coarsely, densely, confluently punctate, finely, longitudinally strigate; antennae inserted at middle in female, slightly behind middle in male, scrobes evanescent behind and without a delimiting carina below base of eye. Antennae with scape not reaching much past middle of eye and not extending to hind margin of eye; funicular segment 1 broader than, and about twice as long as 2, 2 triangular in outline, narrow at base, almost as long as 3 plus 4, 3-5 each successively slightly more transverse; club about as long as or longer than the four preceding segments. Prothora.r only slightly longer than broad, base and apex subtruncate, basolateral angles obtusely rounded in basal fourth, thence almost straight, but slightly arcuately narrowed, to about apical fourth, thence more strongly rounded to feeble subapical constriction, constriction only slightly interrupting dorsal contour which is otherwise distinctly and evenly arcuate longitudinally; coarsely, densely, evenly, re\iculately punctate, discal punctures individually distinct, their interstices less than half as broad as their diameters, individually distinctly and coarsely reticulate; setae minute and inconspicuous. Elytra more than twice as long as broad (6: 2.5), and more than twice as long as prothorax in same proportion, base subtruncate, subparallel-sided in basal two thirds, thence rounded to apex and with a slight subapical constriction; striae deep and coarse, their punctures large and coarse, much broader than intervals, their setae normally quite distinct, the lateral stria terminating at metacoxa; intervals narrow and convex, each bearing a row of fine slanting, conspicuous, closely placed setae, ninth interval rather abruptly costiform beyond apex of second ventrite and joined to third at a distance from elytral apex. Legs with tibial unci very strongly developed, tooth at inner apical angle minute; third tarsal segment deeply bilobed. Sternum coarsely and densely punctate throughout, punctures broader than their interstices; prosternum broadly depressed in middle beyond coxae, intercoxal process slightly narrower than a coxa; metasternum with interstices of punctures shiny, intercoxal process of mesocoxae as broad as a mesocoxa, as long between mid and hind coxae as three times breadth of a mesocoxa; metacoxae separated by two thirds the length of the metasternum between tl1e mid and hind coxae. Venter with the first two ventrites tumid in the female, depressed down middle in male, coarsely and densely punctate as the metasternum, interstices shiny; ventrites 3 and 4 coarsely punctate in their basal half; ventrite 5 coarsely and densely punctate throughout, coarsely reticulate, sparsely setose. Length, 1.6-2.0 mm.; breadth, 0.5-0.6 mm.

Holotype male, Orote Point, Aug. 2, 1936, Swezey (bearing label "on red spider on Ipomoea," in error?); TODO allotype female, same place, May 24, Swezey; one paratype with similar data; one paratype, Piti (on hedge), Oct. 22, Swezey; and one paratype, Agana, May 2, Usinger.

In addition to the characters given under Choerorrhinodes constricticeps for the separation of this species from that, it should be noted that the antenna! scape does not reach to the hind margin of the eye, the scrobes are not delimited behind by a carina below the basal edge of the eye, the crown of the head is at least in-part punctate and the rostrum is longitudinally strigate.

It gives me much pleasure to dedicate this species to Sir Guy MarshaII as an expression of my gratitude and appreciation for his unfailing kindness and cooperation in aiding me in my studies of difficult groups of Curculionidae .

32. Choerorrhinodes flavisetosus , new species (pl. 4, F).

Male: derm dull reddish brown, to black, appendages paler, dorsum piceous; setae conspicuously golden yellow.

Head without a constriction behind eyes, sides evenly arcuate from base to eyes, dorsum strongly convex, coarsely reticulate, almost entirely impunctate and bare from base to a line just back of eyes, thence densely, rather coarsely punctate, the stout golden setae somewhat more condensed along inner margins of eyes and across top of punctate front; interocular area twice as broad as an eye as viewed from above, dorsal outline straightly continuous with that of rostrum; eyes separated from prothorax by only about longitudinal diameter of an eye. Rostrum slightly arcuate below, almost straight, straight above almost to antennae, thence gently arcuate, about three fifths as long as pronotum, hardly narrowed on sides from base to antennae, appearing slightly, rather evenly expanded from base to apex, greatest apical breadth only about one eighth broader than narrowest post-antenna! breadth; coarsely reticulate, puncturation mostly similar to that on interocular area, but becoming shallower and less definite distally, with a few scattered golden setae; antennae inserted at middle but appearing more apically inserted because of scrobe being continued past insertion; scrobes deep and well defined to near fore margin of eyes, evanescent behind and without a posterior delimiting carina. Antennae with scape stout, reaching to hind margin of eye; first funicular segment about one third broader than 2, about as long as 2 plus 3, 2 longer than 3, 3 less bulky than 4 or 5, 3 to 5 successively larger and more transverse; club stoutly oval, as long as four preceding segments. Prothorax as broad as long, broadest at about basal third, strongly rounded on sides, most strongly so in basal third from truncate base to strongly marked subapical constriction, constriction only slightly impressed across otherwise slightly arcuate, somewhat flattened longitudinal dorsal contour; apex slightly, broadly emarginate; coarsely reticulate; disk densely punctate, punctures moderately large, but shallow, their interstices narrower than their diameters; most of punctures bearing coarse, decumbent, medially directed, golden setae. Elytra coarsely reticulate, twice as long as broad, somewhat more than twice as long as prothorax; base subtruncate, subparallel-sided to apical third, thence broadly rounded to apex; striae mostly rather shallow and not sharply margined, narrower than intervals, their punctures comparatively shallow and broader than grooves, bearing minute, hardly discernible setae; outer stria terminating at metacoxa; intervals flat or almost so, punctate, punctures bearing coarse, blunt golden setae, setae very conspicuous, slanting, close set in single rows, about as long as breadth of intervals, with ninth interval becoming more costiform above fourth ventrite and joining third. Legs with femora and tibiae with scattered, decumbent, golden, fine hairlike setae; tibial unci well developed, so formed that their inner margins arise from a point near inner apical angles of tibiae, their inner margins, at least on fore pair, making a continuous concave curve that ends in tooth at inner apical angle, teeth at inner apical angles minute; third tarsal segment deeply bilobed, fourth segment beginning at basal third of third segment. Sternum with prosternum coarsely and densely punctate, interstices narrower than punctures, subapical constriction deeply impressed across apical fourth, distance between fore margin of coxae and apex more than twice that behind coxae, intercoxal process only one third as broad as a coxa; intercoxal process of mesosternum flat, about two thirds as broad as a coxa; metasternum broadly concavely flattened down middle in male, densely, rather coarsely punctured, interstices narrower to almost as broad as punctures, each puncture bearing a decumbent golden seta, median line striaform, impunctate, distance between mid and hind coxae three times length of a metacoxa at trochanter or slightly more than twice as broad as a mesocoxa, metacoxae separated by a distance equal to twice length of a metacoxa at trochanter. Venter with first two ventrites punctate and setose as the metasternum, the first rather deeply and broadly concave in the male; ventrites 3 and 4 finely punctate near fore and hind margins; ventrite 5 densely set with setiferous punctures, convex, but with about apical half semi-circularly impressed and less coarsely punctate. Length, 2.3 mm.; breadth, 0.8 mm.

Holotype male collected at Machanao, June 6, 1936, Usinger.

This species is most distinct from the other species described here because of its conspicuous, golden-yellow setae, less coarsely striated and punctate elytra, non-constricted head, more approximate coxae, different structure of the tibial unci, stouter form and other characters.

When a proper revision of the genera of the Cossoninae is written, or when other revisionary work is done, it might be shown that Choerorrhinodes cannot include this aberrant species, and perhaps a new genus may be erected for it. The non-constricted head, and more particularly the more approximate coxae and the structure of the tibial unci are divergent characters. On the other species of Choerorrhinodes described here, the tibial uncus arises distinctly from the outer apical angle and its inner margin is far removed from the inner apical angle of the tibia and the tibia is more or less straight from the base of the uncus to the tooth at inner apical angle. On this species, however, the uncus, although originating as an extension of the outer tibial margin, is so broad at the base and so curved that it appears to arise from the entire apex itself, rather than from the outer edge, and its inner margin continues on to the base of the tooth at the inner apical angle of the tibia.