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Sabtribe Oncideiut^. 
Group Onciderina. 
Genus Hypselomus, Perty. 
Perty, Delectus Anim. Articul. Brasil, p. 95 (1830-34). 
Syn. Hypsioma, Serv. Ann. Soc. Ent. Fr. p. 38 (1835). 
This genus is distinguished from its allies by its short sub- 
trigonal form of body, with projecting and often acute shoulders 
of the elytra. The claw-joint of the tarsi is not so much elon- 
gated as in OncidereSy or even Clytemnestra. It is very closely 
allied to the latter genus, but is distinguishable at once by the 
abrupt clavate form of the basal joint of the antennse and the 
curved shape of the third. The males of most species have a 
short, slender, curved joint at the tip of the eleventh joint of 
the antennae, which is sometimes visible (but much smaller) in 
the female. 
1. Hypselomus basalisy Thomson. 
Hypsioma basalis, Thomson, Classif. des Cerambyc. p. 117. 
II. modice elongatus, brunneus ; capite, thorace et elytrorum parte 
antica rufesceiiti-ochraceis ; summa fronte acute bituberculata ; 
an tennis nigris, basi rufescenti-ochraceis, articulis cseteris basi 
rufescentibus ; elytris basi utrinque vix elevatis, nigro tuberculatis 
humeris, apice nigris ; abdomine lateribus rufo vittatis ; pedibus 
nigricantibus, tibiis compressis, posticis ( d ) apice dilatatis. Long. 
6-9 lin. c? $ . 
A common insect throughout the Amazons region, being- 
found, like the rest of the species, on dead branches, closely 
adhering to them, and gnawing the bark and wood all round, 
until the bough is sometimes severed. The face and parts 
of the mouth are much elongated and directed a little back- 
wards between the anterior haunches, so that when the legs are 
extended, grasping a branch, the jaws are in a good position to 
gnaw effectually. The supplementary joint of the antennse is 
very conspicuous in the males of this species. 
2. Hypselomus picticornis, n. sp. 
II. suboblongus, brunneus, elytris fascia obliqua indistincta palli- 
diore ; antennis brunneis, articulo toto et cseteris-^basi rufes- 
centibus ; elytris basi baud tuberculatis, humeris oblique conicis 
rnodice productis. Long. 7 lin. 2 • 
Head brown, forehead near base of antennse with two very 
small conical tubercles. Antennse about the length of the body, 
setose beneath ; basal joint strongly and abruptly clavate, third 
much bent, dark brown; second joint, basal half of third, and 
bases of each remaining joint pallid reddish. Thorax scarcely 
s 
