OCR Text |
Show 508 INSECTA. CENTORHYNOHUS. Where the scutellum is hardly apparent, and the e•l ytra ' rou nd e d at the extremity, do not entirely cover the abdomen. The eyes remote. The club of the antennre is oval, and the extremity of :~e tibire is without spines(1). e There, the antennre have but eleven joints. HvnATrous(2). Ot.hers have the body ovoid, short, strongly inflated above, with the crrcumference of the abdomen clasped by the elytra. The thighs are canaliculate, and receive the tibire in their sulcus. Their eyes are large. The antennre always consist of twelve joints. OnoBITis( 3 ). Others, with an oblong, convex body, and the anterior legs usually longer, particularly in the males, with antennre consisting of twelve joints, the eyes remote, and elytra covering the abdomen, will form the subgenus CnYPTORHYNOHus( 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? Schamh. M. Chevrolat has discovered one species-Rhyncluenus ptinoidea, Gyll.-in the vicinity of Paris. . The remaining Longirostres have generally nine joints at most in the antennre, and the last, or two last at most, form a club with a coriaceous epidermis and spongy extremity. l"'hey feed, at least while in the state of larvre, on seeds or ligneous substances. (1) His genera Centorltynchus, Mononychus. (2) Add his .llmalus. (3) The Orobitis, Diorymerus, Ocladius, Cleogonus, of Schrenhert·. ( 4) The genera .llrthosternus, Pinarus, Cratosomus, Macromerus, CryptorltynduJJ, of Schrenherr. The Gasterocerus of Messl's Brullc and Lnporte appears to me to ?elon~ to the Cralosomus proper of Schrenberr, or those in which the proboscis 15 scra,ght and flattened. His subgenus Gorgus is composed of large species, all fr~m South America, and in the males of which the proboscis is usually armed w1th two teeth or horns near the insertion of the antennre. 1 could not find any den~tion in the mandibles, one of the characters which distinguish the Crato· somt from the Cryptorhynchi, where these organs are dentated. COLEOI,TERA. They may be united in the single genus CALANDRA, Which may be divided into six subgenera. 509 'fhe two first are apterous, and present, as well as the preceding and following ones, the last excepted, four joints in all the tarsi, and ofwhich the penultimate is bilobate. Th.e antcnnre are geniculate and inserted at but a little distance from the middle of the proboscis. In the first or ANoHoNus, Schrenh. These organs pt•esent nine joints before the club. The tenth, and perhaps two others, but intimately unit:d with the preceding one, and but little distinct, form a short ovo1d club. In the second OnTHOOHlETEs, Germ.(l) It is the eighth which forms the club, the figure and composition of which appear to be the same as in Anchonus. The other four subgenera are furnished with wings. In the three following ones the tarsi consist of but four joints, the penultimate of which is bilobate. RaiNA, Lat.-Lixus, Fab. The antennre are strongly geniculate, and inserted near the middle of the straight, projecting proboscis, their eight? joint .forming a .highly elongated and almost cylindrical club. The anter10r legs, at least in the males, are longer than the others(2). In CALANDRA properly SO called, The antennre are strongly geniculate, but inserted near the ba!:ic of the proboscis; their eighth joint forms an ovo~d or triangular clu~. C. granaria; Curculio granarius, L., Ohv., Col. V, 83, xv1, 196. But too well known; its body is elongated and brown; thorax as long as the elytra and punctured. Its larva, kn~wn by the name of weevil (genre), is the destroyer of our g:a~ar~es. C. oryzre; Curculio oryzre, L.; Oliv., lb., VII, 81. S1mllar to the preceding, but with two fulvous spots on each elytron. It attacks rice. II C. palmarum; Curculio palmarum, L.; Oliv., lb., , 16. Length an inch and a half; club of the antennre truncated; en- .• (1) Insect. Spec. Nov., p. 302. · . (2) China barbirostris,La.t., Oliv.;-R. scrutator, Ohv. |