t04 INSECTA, 



an abrupt contraction of its diameter, forming a kind of neck ; in 

 several it is vertical. 



In some, the last joint of the palpi is sometimes almost in the form 

 of a cone or reversed triangle, and sometimes nearly cylindrical and 

 truncated at the extremity. The lobe terminating the maxillae is 

 straight, and not curved on the inner one at its end. The head 

 usually projects, or is simply inclined, and in those, where, by a very 

 rare exception — the Dorcaceri — it is vertical, its width is nearly 

 equal to that of the body, and the antennae are very remote at base, 

 and spinous. The thorax, frequently unequal or square, is rarely 

 cylindrical. 



These Longicornes are subdivided into two principal sections or 

 small tribes. 



1. The Prionii, characterized as follows : the labrum null, or very 

 small and indistinct ; the mandibles stout, or even very large, particu- 

 larly in most of the males; the internal lobe of the maxillae null, or very 

 small ; the antennae inserted near the base of the mandibles or the 

 emargination of the eyes, but not surrgundod by the latter at base ; 

 the thoias most frequently trapezoidal or square, crenated or dentated 

 laterally. 



The first genus, or 



Parandra, Lat. — Attelabus, De Geer, — Tenebrio, Fab., 

 Where, as in the following, the antennae are simple, almost granose, 

 compressed, of equal thickness throughout, and as long as the thorax 

 at most, and the terminal lobe of the maxillae is very small, scarcely 

 reaching to the extremity of the first joint of the palpi, is distin- 

 guished from that genus ''', as Avell as from all others of the same 

 family, by its corneous ligula, which is in the form of the segment 

 of a very short transversal circle, without emargination or lobes, 

 and by its tarsi, the penultimate joint of which is slightly bilobate, 

 and the last, much longer than the preceding ones taken together, 

 presents between its hooks a little appendage with two terminal 

 setae. The body is a parallelopiped, and depressed, and the thorax 

 square, rounded at the posterior angles, and without spines or teeth. 

 These Insects arc peculiar to America f. 



Spondylis, Fab. — Attelabus, Lin. — Cerambyx, De Geer. 

 The Spondyles, which approximate to the Parandrae in their antennae 

 and the exiguity of their maxillary lobes, arc removed from them by 

 their ligula ; the latter, as in all the following Longicornes, is mem- 

 branous and cordiform. They also differ in the tarsi ; the penul- 

 timate joint is deeply bilobate, and the last is not longer than the 



* Tlie mandibles of the Spondyles and Parandrae are, at most, as long as the 

 head, triangular or conical and arcuated at the end. 



t See Lat., Gener. Crust, et Insect., Ill, 28, and I, ix, 7 ; Schccnh., Synon. 

 sect., I, iii, p. 334, and App., p. 145, and Encyc. Method., article Parandre. 



