Dryotribodes denticulatus, Zimmerman, 1942

Zimmerman, Elwood C., 1942, Curculionidae of Guam, Insects of Guam I, Honolulu, Hawaii: Bernice P. Bishop Museum, pp. 73-146 : 136-137

Dryotribodes denticulatus , new species (pl. 5, C).

Female: clerm reticulate, dull but somewhat shiny on more elevated areas, dull black, diluted with reel, antennae and legs reddish; setae pale; with a thin, inconspicuous, partial incrustation.

Head conspicuously narrowed on sides from base to eyes, as broad across eyes as length from pronotum to fore edge of an eye; the postocular constriction not impressed on sides, but distinct across dorsum, constriction about the length of an eye behind eyes as measured from above; with only a few scattered punctures on crown behind constriction; coarsely densely, longitudinally confluently punctate beyond constriction, puncturation continuous with that of rostrum; eyes distinctly interrupting lateral contours of head, but not strongly protuberant, twice as widely separated above as breadth of an eye as measured from above, interocular area narrowing posteriorly. Rostrum evenly arcuate from postocular constriction to apex, about twice as long as head and five sevenths as long as prothorax, three times as long as its breadth at extreme base, gradually and slightly expanded from base to antennae, sides slightly concave, thence abruptly expanded, sides thence shallowly concave to apex, apical breadth equal to that at antennae and almost one fourth wider than extreme base; very coarsely and densely, subconfluently and confluently punctate from base to half way between antennae and apex, thence polished and with small, shallow punctures to apex; antennae inserted at middle at about two and one half times longitudinal diameter of an eye from eyes; scrobes passing downward at a distance from eyes; their dorsal margins obsolete behind, scrobe itself evanescent behind. Antennae with scape long, reaching more than half way between hind margin of eyes and prothorax, to behind postocular constriction, rather abruptly clavate, almost as long as funicle plus club; funicle with segments 1 and 2 subequal in length, 2 not quite as long as 3 plus 4, 4 to 7 subquadrate, each successively very slightly broader, each with a whorl of long setae; club ovate, as long as preceding five segments, densely, evenly, finely setose throughout. Prothorax longer than broad (3.5: 3), base subtruncate, without a distinct subbasal constriction, evenly arcuate, on sides from base to subapical constriction, longitudinal dorsal outline almost evenly convex from base to apex; coarsely and densely punctate throughout, punctures large, broader than interstices, reticulately placed, and bearing fine, hairlike, anteriorly inclined setae. Elytra twice as broad as long, somewhat more than twice as long as prothorax (4: 1.7), broadest at apical third, arcuate on sides from base to about caudal fourth, but slightly interrupted at about basal third where ninth interval joins seventh, thence constricted, lateral outline made by seventh interval, outline thence continued and bluntly rounded by outer interval; striae about as broad as intervals, their punctures coarse; first two intervals plain, first with a few granules near apex, interval 3 elevated from base to apex and bearing a row of granules in caudal third and a few near base, 4 plain, not reaching past caudal fourth, 5 elevated from a distance about equal to space between it and third interval and terminating well before apex of 7, and bearing granules on elevated part, 4 and 5 not distinct individually at base, 6 more or less partially obliterated by punctures of adjoining intervals, 7 elevated, most strongly so behind point where it is joined by 9 and bearing a row of well-developed teethlike granules or tubercles that give sides of elytra their distinctive denticulate appearance when viewed from above, joining 4 or 3 well within caudal fourth, 8 slightly elevated, beginning in front of middle and terminating at about caudal fourth, 9 elevated and arising from 7 at about basal fourth, enclosing 8 and continued to apex to join 3, 10 obliterated by punctures of adjoining striae; each interval bearing a series of stiff, hairlike, posteriorly inclined, golden setae, most distinct on elevated intervals from whose tubercles they arise. Legs with femora and tibiae coarsely sculptured, with inclined, hairlike setae arising from punctures; tibial unci and mucrones well developed; tarsi with third segment one third broader than second, as broad as long, entire, very slightly emarginate at apex, not at all bilobed. Sternum with prosternum shallowly concave down middle behind apex, antecoxal area twice as long as postcoxal area, intercoxal process half as broad ai!' a coxa; intercoxal process of mesosternum about as broad as a coxa; metasternum between mid and hind coxae slightly shorter than length of first ventrite behind a coxa, coarsely and densely punctured. Venter with intercoxal process of first ventrite broad and subtruncate, broader than transverse diameter of a coxa; first two ventrites coarsely and densely punctured throughout, with fine setae arising from hind edges of punctures; ventrites 2 and 3 each with a row of small punctures; ventrite 5 coarsely punctate and setose except for a transverse, impunctate basal band. Length, 2.75 mm.; breadth, 1.0 mm.

Marquesas Islands . Holotype female, Uapou Island, from a dead Cyathea frond, Nov. 28, 1931, LeBronnec.

This species is the most divergent of the three described because of its poorly defined cephalic constriction and long, clavate antenna! scape. The denticulation on the seventh interval along the sides and the outer interval near the apex are distinct and give the sides of the elytra a characteristic appearance.