542 INSECT A. 



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

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

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

 compose the genus Rhagium of Fabricius or Stenocorus of Olivier, 

 including also some of the Lepturetse of the former. Later ento- 

 mologists 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 antennce, always sim- 

 ple, 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 

 spiniform tubercle(l). 



Rhamnusium, Meg. 



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

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

 The eyes are evidently emarginated(2). 



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(3). 



Stenoderus(4), Dej. — Cerambyx, Fab. — Leptura, Kirb. — Stenoco- 

 rus, Oliv. 



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



(1) The Rhag. bifasciatum,indagator, inquisitor, mordax,T&h. 



(2) Rhagium salicis, Fab. 



(3) See the Catal., of Dejean and Dahl. In the Leptura virginea and coUaris 

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

 the antennx are rather shorter than the fifth. 



(4) Near the subgenus Stenoderus come Distenia 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 antennae simply furnished with a dense 

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

 niae 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 subgenera are from Brazil. 



