120 INSECT A. 



alone are furnished with wings. Their thorax is conical and smooth, 

 without spines or tubercles. They compose the genus 



Vesperus, Dej. — Stenocorus, Fah. Oliv. 



Their head is large and placed on a kind of rotula. The antennae 

 are long and slightly serrated, with the first joint shorter than the 

 third. The last joint of the palpi is almost triangular. The eyes are 

 oval and slightly emarginated. Tlie elytra of the females are short, 

 soft, and gaping *. 



In the following Insects, and of the same subdivision, both sexes 

 are furnished with wings, the thorax is tuberculous or spinous later- 

 ally, unequal, and as if turned up at the two extremities. They 

 compose the genus Rhagiam of Fabricius, or Stenocorus of Olivier, 

 including also some of the Leptureta of the former. Later entomo- 

 logists have thought it best to divide these Insects into five genera, 

 which may be reduced to four. 



Rhagium, Dahl., 

 Or Rhagium, properly so called, where the antennae, always simple, 

 are at most half as long as the body, and where the last joint of the 

 palpi forms a triangular club. The head is large, and almost square; 

 the eyes are entire. Each side of the thorax offers a conical spini- 

 form tubercle f . 



Rhamnusium, Meg.^ 

 Where the antennae, someAvhat shorter than the body, are serrated, 

 with the third and fourth joints shorter than the following ones. 

 The eyes are evidently emarginated +. 



ToxoTUs, Pachyta, Meg. Dej., 

 Where the antennae are at least as long as the body, simple, and 

 with the first joint much shorter than the head; the eyes are entire, 

 or but very slightly emarginated. The abdomen is triangular, or 

 forms a long square, narrowed posteriorly §. 



Stenoderus II, Dej. — Cerambyx, Fab. — Leptura, Kirb. — Steno- 

 corus, Oliv., 



Where the antennae arc also long, but their first joint is at | least 



* Stenccoi-Ks sfrepeyjs, Oliv.. Col., IV, 69, i, b., I, S. luiidus, Ross., Faun. Etrusc. ; 

 Mant., II, App. p. 96, torn. Ill, fig. 1. 



-J- The Rhug. bifasciafum, indagafor, inquisitor, mordax, Fab. 



X Rtiagium salicis, Fab. 



§ See the Catal. of Dejean and Dahl. In the Leptura virginea and collaris of 

 Fabricius, which I refer to the subgenus Toxotus, the third and fourth joints of the 

 antennfe are rather shorter than the fifth. 



II Near the subgenus Stenoderus come Distenta and Cometes, two genera 

 established by Messrs. Lepeletier and Serville, Encyc. Method., X, 485. Their 

 thorax is tuberculous or spinous laterally, which removes them from Stenoderus, 

 where the palpi are also shorter, and the antenna; simply furnished with a dense 

 pubescence, and not pilose, as in these two subgenera. The elytra of the Disteniae 

 are gradually narrowed from their humeral angles to their extremity, which is armed 

 •with a spine ; they are linear and unarmed in Cometes. The species of both sub- 

 genera are from Brazil. 



