536 INSECTA. 



The Cerambyx longimanus of Linnaeus and Fabricius belongs 

 neither to this genus nor to that of Prionus, in which it was first 

 placed, but forms a separate one and such was the opinion of Illi- 

 ger and Thunberg of the tribe of the Lamiariae. It is the 



Acrocinus, Illig. Macropus, Thunb. 



It is distinguished from all the Longicornes by the thorax, each 

 side of which is terminated by a movable tubercle, terminating in a 

 point, or by a spine. The body is flattened, and the thorax trans- 

 versal; the antennas are long and slender, and the anterior legs longer 

 than the others; the elytra are truncated at the end and terminated 

 by two teeth, the exterior of which is the strongest. 



Jl. longimanus; Cerambyx longimanus, L. ; Oliv., Col. IV, 66, 

 iii, iv, 12, known by the vulgar name of the Cayenne Harlequin. 

 The thighs and tibiae of the two anterior legs are very long and 

 slender. The movable tubercles of the thorax are terminated 

 by a strong spine, and the elytra are beautifully variegated with 

 grey, red, and black(l). 

 All the remaining Lamiarise compose but the single genus 



Lamia 7 



Which we will separate into two sections: those in which the sides 

 of the thorax are sometimes tuberculous or rugose and sometimes 

 spinous, and those in which it is smooth and cylindrical. 



The first are divided into those that are furnished with wings, and 

 those which are apterous. 



The genus Acanthocixus, Meg. Dej., is formed of a great number 

 of species, mostly from South America, in which the body is pro- 

 portionally shorter, wider, depressed, or but slightly elevated, and 

 the abdomen almost square and hardly longer than it is wide. The 

 legs are robust, and the tarsi strongly dilated. 



There are several species in Europe, one of which, the 



L. sedilis, Fab., brown, with a greyish down, four yellow dots 

 on the thorax, and two blackish bands on the elytra, is remark- 

 able for the length of the antennae of the male, which is quadru- 

 ple that of the body(2). 

 Next to the Acanthocini should come the genus Tapeina of Messrs 

 Lepeletier and Serville Encyc. Method., X, 545. The antennae of 

 the males are inserted into a posterior extremity of a long appendage 



(1) Add Prionus accentifer, Olivier. 



(2) For the other species see Catalogue, &c, Dej., p. 106. 



