Jordanthribus conspersus, Zimmerman, 1942

Zimmerman, Elwood C., 1942, Anthribidae Of Guam, Insects of Guam I, Honolulu, Hawaii: Bernice P. Bishop Museum, pp. 65-72 : 67-68

2. Jordanthribus conspersus , new species ( fig. 1 , c; pl. 1, A).

Female: derm yellowish, infuscate, with dorsum confusedly infumated with yellowish and fuscous patches; pubescence grayish white.

Head with vertex convex and making a rounded angle with front which is flattened continuously with rostrum; crown finely punctate, front set with rather large, comparatively coarse, shallow subconfluent punctures; pubescence hairlike, that on front finer and longer than that on crown; cheeks concave; eyes reniform, the distance between their dorsal apices slightly less than the length of an eye (12: 15). Rostrum slightly shorter, from ventral angulation with head to apex of mandibles, than head; conspicuously and continuously flattened above with front of head, sides making an angle with dorsum, sculpture and pubescence as that on front of the head, greatest distal breadth twice as broad as distance between tops of eyes. Antennae with first segment sinuous, as long as 2 plus 3, 2, 3, and 4 subequal in length, 4 as long as 5 plus half of 6, 5 to 8 each successively very slightly smaller, almost subequal in length, segments 9 and 10 subequal in length, elongate-triangular, 11 elongate-oval, almost as long as 10 plus half of 9. Prothorax strongly transverse (2.7: 1.7), disk slightly, transversally depressed just beyond middle, shallowly and densely punctate, each puncture bearing a sharp, cons,picuous seta; lateral carina forming a continuous curve with dorsal carina, not quite reaching middle of side. Elytra slightly less than three fourths as broad as long, two and three fourths as long as prothorax, subparallel-sided in basal two thirds, with a shallow depression at basal third of each elytron; striae well impressed, punctures distinct; intervals broader than striae, not punctate; pubescence prostrate, similar to but somewhat shorter than that on prothorax. Legs with fore tibiae as long as fore femora, first fore tarsal segment one third as long as a fore tibia. Sternum with fore coxae separated by half the diameter of a fore coxa, mid and hind coxae equally separated by a distance half again as broad as separation of fore coxae; metasternum between mid and hind coxae slightly broader than a metacoxa at trochanter, shallowly punctate; pubescence broader and condensed on pleurae. Ve11ter shallowly and densely punctate throughout, pubescence abundant, but not dense; fifth ventrite as long as four plus half of three. Pygidium as broad as long, as long as ventrite four plus five, shallowly punctate, rather densely pubescent, apex broadly rounded. Length, 3.0 mm.; breadth, 1.5 mm.

Male: differs from female principally in structure of the rostrum and antennae; rostrum about one fourth longer than ventral angulation of head to apex of mandibles than head, about one fourth as thick at base as long, continuously flattened with head from tops of eyes to apex, sides suddenly explanate beginning at half the distance between lower edge of eye and base of mandibles, margin raised and flangelike and making sides conspicuously angulate (see fig. 1 , C), broadest part of angulation more than one fourth broader than base, but slightly narrower than greatest apical breadth of rostrum; front of head with conspicuous, long, dense hair from antenna! tubercle to base of rostrum, without a series of long, coarse, conspicuous, erect setae between antennae; antenna with first segment strongly arcuate, not quite as long as 2 plus 3, 2 about as long as 3, 3 somewhat longer than 4, with its lower edge produced into a strong hook at apex fully twice as long as breadth of base at 4, lengths of following segments as follows: (4, 1.4) (5, 1.4) (6, 1.3) (7, 1.1) (8, 1.0) (9, 0.9, 0.4 broad at apex) (10, 0.7, 0.4 broad at apex) (11, 0.9, 0.4 broad at middle).

Holotype female and one female paratype collected from Citrus at Inarajan, by Swezey , May 7, 1936, in Bishop Museum ; allotype male collected by Fullaway and labeled "Island Guam" no. "1133" to be deposited in the National Museum.

This species may be separated from its congener, Jordanthribus planifacietus , by its larger size and darker coloration as well as by the characters given in the key.

Figures

FIGURE 1.-a, side view of prothorax, head, and rostrum, and b, front view of head and rostrum of Jordanthribus planifacietus Zimmerman; c, front view of head and rostrum of J. conspersus Zimmerman; d, antenna! club of Araecerns fasciculatus (De Geer); e, antenna! club of A. vieillardi (Montrouzier).