120 INSECTA. 
alone are furnished with wings. Their thorax is conical and smooth, 
without spines or tubercles. They compose the genus 
Vesperus, Dej.—Srenocorus, Fab. Oliv. 
Their head is large and placed on a kind of rotula. The antennz 
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. The 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 Rhagium 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 fonr. 
Ruagium, Dail., 
Or Rhagium, properly so called, where the antennz, always simple, 
are at most half as long as the body, and where the last joint of the 
palpi forms a triangular club. The beads is large, and almost s square ; 
the eyes are entire. Each side of the thorax offers a conical spini- 
form tubercle f. 
Ruamnvsium, Meq., 
Where the antenne, somewhat shorter than the body, are serrated, 
with the third and fourth joints shorter than the following ones. 
The eyes are evidently emarginated ¢. 
Toxorus, Pacnyra, Meg. Dey., 
Where the antenne 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 ||, Dej.—Cerrampyx, Fab.—Leprvra, Kid. —STENo- 
corus, Oliv., 
Where the antenne are also long, but their first joint is at] least 
* Stenocorus strepens, Oliv., Col., TV, 69, i, b., 1, S. luridus, Ross., Faun. Etruse. ; 
Mant., II, App. p. 96, tom. III, fig. 1. 
t+ The Rhag. bifasciatum, indagator, inquisitor, mordax, Fab. 
+ Rhagium 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 
antenne are rather shorter than the fifth. 
|| Near the subgenus Stenoderus come DirstENTA and ComeETEs, two genera 
established by Messrs. Lepeletier and Serville, Encye. Méthod., X, 485. Their 
thorax is tuberculous or spinous laterally, which removes them from Stenoderus, 
where the palpi are also shorter, and the antenne simply furnished with a dense 
pubescence, and not pilose, as in these two subgenera. The elytra of the Disteniz 
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, 
