308 MR. J. CURTIS ON A NEW GENUS 
que feré in medio angulos, in foemina minus conspicuos, efformantibus: scutellum semi- 
ovatum. Corpus cylindricum. Elytra ampla, subdepressa: ale ample. Abdomen elytra 
longitudine superans, obtusum, ad apicem in mare rotundatum incurvum, segmento 
ultimo discum magnum, ovatum, convexum efformante ; segmento basali (maris) anticé 
in medio dente valido instructo. Pedes longissimi, robusti (preesertim maris), in utroque 
sexu densé pubescentes : femoribus tibiis brevioribus, que (prasertim anteriores) dila- 
tate, externé 3-denticulate, dente apicali longiore: tibiis quatuor posterioribus ad apicem 
breviter spinosis: tarsis totis pilis setosis vestitis, 5-articulatis, articulis basalibus 
quatuor brevibus, paris anterioris in mare dilatatis, articulo basali in foemina longiore 
et graciliore, reliquis ad apicem spinis validis, articulo terminali longiore, clavato, ad 
basin 6-spinoso, apice appendiculo longo linguiformi ; tarsis posterioribus tibiis longi- 
oribus : unguibus tarsorum articulum terminalem subzequantibus, ad basin processu apice 
bisetoso instructis ; feemine omnibus, maris posticis tantum, validis apice bifidis. 
Ancistrosoma is distinguished from neighbouring genera by the stoutness of its legs 
and the sharp lateral edges of its thorax: the male is further characterized by an acute 
and rather long and slightly curved spine near the base of the abdomen beneath. Its 
natural situation is probably between Diphucephala, Dej., the males of which have a 
bilobed clypeus, and Macrodactylus, Latr., which is very similar to our insect in habit, 
and has very long, but slender, legs; but neither of these has the little tooth at the 
base of the thorax, lapping over the scutellum, and Ceraspis, Lep. and Serv., which has 
that character, is readily separated by its long antenne and club, independently of the 
differences already mentioned. 
Ancistrosoma Kuuveul. 
Ane. ferrugineum supra piceo-nigrum ; thoracis margine elytrorumque strigis sex albidis. 
Long. maris 12 lin. ; foemine plerumque minor. 
Hab. in Peruvia. 
Description. Ferruginous ; base of the head blackish, punctured, and clothed with 
short ochreous hairs, with a waved elevated line across the middle, extending over the 
inner margin of the eyes: ¢horax piceous black, with a punctured channel down the 
middle, the margins punctured, ferruginous and whitish with short hairs ; having two 
large dull ovate spots at the base in the female: scutellum clothed with ochreous 
hairs : elytra piceous black, with three broad punctured furrows on each, white with 
short hairs, the sutural one not reaching the base, but extending round the apew, the 
second neither extending to the base nor ape, and the outer one still shorter: legs 
thickly clothed with long orange or bright ochreous hairs, excepting the anterior tibie : 

