508 INSECTA. 



Centorhynchus. 



Where the scutellum is hardly apparent, and the elytra, rounded 

 at the extremity, do not entirely cover the abdomen. The eyes are 

 remote. 'IMie club of the antennae is oval, and the extremity of the 

 tibix is without spines(l). 



There, the antennae have but eleven joints. 



Hydaticus(2). 



Others have the body ovoid, short, strongly inflated above, with 

 the circumference of the abdomen clasped by the elytra. The thighs _ 

 are canaliculate, and receive the tibiae in their sulcus. Their eyes 

 are large. The antennae always consist of twelve joints. 



Orobitis(3). 



Others, with an oblong, convex body, and the anterior legs usually 

 longer, particularly in the males, with antennae consisting of twelve 

 joints, the eyes remote, and elytra covering the abdomen, will form 

 the subgenus 



CRYPtORHYNCHUS(4). ' 



Those which are apterous, or where the wings are at least very 

 imperfect and the scutellum is wanting, will form another, or 



Tylode. — Ulosomus, Seleropterus? Schocnh. 



M. Chevrolat has discovered one species — Rhynchaenus ptinoides, 

 Gyll. — in the vicinity of Paris. 



The remaining Longirostres have generally nine joints at most in 

 the antennas, and the last, or two last at most, form a club with a 

 coriaceous epidermis and spongy extremity. They feed, at least 

 while in the state of larvae, on seeds or ligneous substances. 



(1) His genera Centorhynchus, Mononychus. 



(2) Add his Amalus. 



(3) The Orobitis, Diorymerus, Odadius, Ckogonus, of Schoenherr. 



(4) The genevsL Arthosternus, Pinarus, Cratosomus, Macromerus, Cryptorhynchus, 

 of Schoenherr. The Gasterocerus of Messrs Brulle and Laporte appears to me to 

 belong to the Cratosomus proper of Schoenherr, or those in which the proboscis 

 is straight and flattened. His subgenus Gorgus is composed of large species, all 

 from South America, and in the males of which the proboscis is usually armed 

 with two teeth or horns near the insertion of the antennae. 1 could not find any 

 dentation in the mandibles, one of the characters which distinguish the Crato- 

 somi from the Cryptorhynchi, where these organs are dentated. 



