554 INSECTA. 



Sometimes the antennae are short, pectinated, or serrated from the 

 fourth or fifth joint. 



Here the exterior margin of the elytra is straight, or is but slightly 

 emarginated; the posterior angles of the thorax are rounded and not 

 arched, and the anterior ones are not bent underneath. The body 

 is always in the form of a short cylinder? the antennae are always 

 free, and the eyes entire or but slightly emarginated. The males 

 frequently have the head broader, the mandibles stronger and more 

 salient, and the anterior legs longer. 



Clythba, Leach, Fab. — Melolontha, Geoff. 



C. guadripunctatd; Chrysomela quadripunctata,L,., Oliv., Col. 

 VI, 96, i, 1. From four to five lines in length; black; elytra 

 red, each marked with two black dots, the anterior of which is 

 the largest. 



The larva inhabits a coriaceous tube that it drags about with 

 it, and which with the animal was sent to me by M. Waudoner, 

 from Nantes(l). 

 There, the elytra, strongly dilated exteriorly at their origin and 

 then suddenly narrowed, present a deep emargination. The poste- 

 rior angles of the thorax are acute, arched and form a roof; the an- 

 terior are strongly curved underneath. The antennae are laid along 

 its inferior sides, or are lodged under its edges. The eyes are evi- 

 dently emarginated in several. The superior surface of the body in 

 those, and they are the greatest number, where it is less short and 

 convex, is usually very uneven. 



These Chrysomelinse are exclusively proper to the western con- 

 tinent. 



Chlamys, Knoch. 



Where the form of the body approaches that of a short cylinder or 

 of a cube, with the thorax abruptly elevated, and as if hump-backed 

 in the middle, and the middle of its posterior margin prolonged or 

 unilobate. The body is in general extremely scabrous. In some 

 the labial palpi are forked(2). 



(1) See Olivier and Fabricius, but abstract from the genus of the latter those 

 species which belong to the following one. 



(2j See Olivier, but more especially the excellent Monograph of M. Kollar, 

 and that of Kliig. See also Knoch, New. Beytr. Insect., p. 122, and Lat, Gener. 

 Crust, et Insect., Ill, p. 53. 



