Tytthoxydema, Zimmerman, 1942

Zimmerman, Elwood C., 1942, Curculionidae of Guam, Insects of Guam I, Honolulu, Hawaii: Bernice P. Bishop Museum, pp. 73-146 : 127

Genus TYTTHOXYDEMA , new genus

Body slender, subcy!indrical, nitid, minutely setose. Head subconical, as broad as long, with a distinct postocular constriction situated well behind eyes interrupting both dorsal and lateral surfaces; eyes moderately large, lateral, not strongly protuberant, as widely separated below as above, separated from prothorax by a distance distinctly greater than length of an eye; interocular area slightly narrower than extreme base of rostrum. Rostrum almost as long as head, about half as long as prothorax, slightly arcuate, stout, lat!erally expanded from base to apex; antennae inserted close to base at less than diameter of an eye in front of eyes; scrobes passing downward along the fore edges of the eyes. Antennae with scape reaching to or slightly behind hind margins of eyes, longer than funicle; funicle 5-segmented, first segment longer than any of others, the following successively shorter; club ovate, slightly shorter than funicle, its basal segment setose. Prothora.r sub-pyriform, longer than broad, subapically constricted, subtruncate at base. Scutelfom visible, small. Elytra slightly broader than base of prothorax at humeri, subparallel-sided, regularly punctate-striate, 10-striate, tenth stria complete. Wings folly developed. Legs with clavate femora edentate, hind pair not reaching apex of second ventrite; tibiae not much longer than tarsi, compressed and expanded distally, fore pair angulate beyond middle below, strongly uncinate and mucronate; tarsi with second segment about as long as 3, 3 not bilobed, but slightly broader than 2, 4 slender and projecting beyond apex of 3 for a distance greater than length of 2 plus 3. Stemmn with ant~rior margins of fore coxae near transverse median axis of prosternum, intercoxal process slightly narrower than breadth of a coxa; mesosternum flat in front of intercoxal process which is slightly broader than breadth of a mesocoxa; metasternum between mid and hind coxae about as long as first two ventrites behind a coxa; metacoxae separated by about transverse diameter of a metacoxa; metepisternum distinct. Venter with intercoxal process of first ventrite arcuate; ventrites 1 and 2 fused, 1 about as long as 2 plus 3 at sides, 3 and 4 subequal, together slightly shorter than 2 and about as long as 5.

Genotype: Tyttho.r:ydema e.xilis, new species.

This genus is erected for a puzzling species, which, although havinga TODO 5-segmented funicle, should probably be placed in association with O.xyde111a, Aphanocorynes , and their allies. Sir Guy Marshall has describeda TODO genus ( Pento.r:ydema, 1938) in the same group whichalsohas5 -segmenteclantennae. It was, however, erected for a large, different type of cossonid. This situation is similar to that of Dryotribodes , because Tyttho.xydema would be placed in a different subtribe from Oxyde111a according to the existing classification.