Himatinum bisetosum, Zimmerman, 1942

Zimmerman, Elwood C., 1942, Curculionidae of Guam, Insects of Guam I, Honolulu, Hawaii: Bernice P. Bishop Museum, pp. 73-146 : 131-132

36. Himatinum bisetosum , new species (pl. 4, C).

Derm coarsely reticulate, dull reddish brown to piceous black; setae conspicuous, white or yellowish white.

Head without a postocular constriction, only one third as long on sides from prothorax to fore margins of eyes as basal breadth; eyes oval, about four sevenths as broad as high, obliquely placed, their hind margins touching prothorax, separated by not quite their heights below (6: 7), their dorsal edges reaching to about half way between upper margin of scrobe and top of rostrum; top of head meeting rostrum above top of eye, separation well marked and angulate; crown coarsely reticulate, but shallowly and indistinctly punctate; sparsely clothed with fine, prostrate, anteriorly directed setae. Rostrmn almost straight, but slightly arcuate in apical fourth, subcylindrical, four fifths as long as prothorax in female, two thirds as long in male, about as high as broad at antennae, subparallel-sided, slightly expanded at antennae, hardly expanded toward apex; conspicuously, closely, longitudinally strigulated; setae arising from striae, erect, clavate, coarser than those on crown; antennae inserted at slightly beyond basal fourth, dorsal margin of scrobe straight and touching dorsal fourth of eye, lower margin directed toward lower hind edge of eye, but not reaching eye. Antennae with scape shorter than funicle exclusive of club, touching front edge of eye; first funicular segment about one third longer than broad, triangular, as long as 2 plus 3 plus 4, 2 broader than long, 2 to 7 successively slightly broader; club not much broader than 7, as long as 3 to 7. Prothorax longer than broad (3: 2.5), base and apex slightly convex, broadest between the basal third and middle, arcuately narrowing from base to feeble subapical constriction, constriction not or hardly marked across dorsum which is almost straight and flat in longitudinal dorsal contour; disk flattened, densely, shallowly punctate, punctures subconfluent and individually indistinct, interstices much narrower than their diameters; setae of two types, one type slender, more or less hairlike, decumbent and directed medially, the other subclavate, erect or suberect, middle of the apex not setose. Elytra slightly more than twice as long as broad and slightly more than twice as long as protl1orax, base subtruncate, but broadly and shallowly emarginate to scutellum, subparallel-sided to behind middle, thence broadly rounded to apex, without any irregularities; striae about as broad as intervals on disk, their punctures close, subquadrate, without evident setae, outer stria terminating above metacoxa or vaguely continued somewhat farther caudad; intervals flat or slightly convex, none conspicuously elevated, 9 evidently reaching 1 behind, 10 obliterated or obscure behind metacoxa, each interval bearing a row of two types of setae, one type erect and subspatulate, the other type decumbent, narrow and sharp, 2, 4, 5, and 7 sometimes with fewer erect setae than the others. Legs with numerous setae of two types, one finer and prostrate, the other coarser and erect; tibiae compressed, unci large and stout, evidently not mucronate; third tarsal segment as long as and about one third broader than 2, subtruncate at apex. Sternum densely, rather coarsely but shallowly punctate, punctures bearing decumbent or prostrate, mostly fine setae; prosternum three times as long before as behind coxae, intercoxal process slightly broader than a coxa; mesosternum on a continuous plane with metasternum, densely punctate, intercoxal process slightly broader than a coxa; metasternum twice as long between mid and hind coxae as breadili of intercoxal process of mesosternum, metacoxae separated by slightly more than mesocoxae. Venter with first two ventrites broadly depressed down middle in male, more tumid in female, puncturation and vestiture similar to that of the metasternum; ventrites 3 atid 4 each with a row of coarse punctures at their bases and a row of fine punctures at their apices; ventrite 5 densely set with setiferous punctures. Length, 2.1-2.5 mm.; breadth, 0.70-0.75 mm.

Holotype male, allotype female, and one male paratype collected at Tarague, May 17, 1936, Usinger .

The peculiarly placed eyes together with the vestiture will readily separate this species from all of the other Guam Cossoninae . It greatly resembles the North American Hiniatinum errans (LeConte) but the rostrum is longer and the cephalic, leg and rostral vestiture is shorter and less dense.