Choerorrhinodes constricticeps, Zimmerman, 1942

Zimmerman, Elwood C., 1942, Curculionidae of Guam, Insects of Guam I, Honolulu, Hawaii: Bernice P. Bishop Museum, pp. 73-146 : 122-123

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.