44 INSECTA. 
of the abdomen almost wholly or for the greater part, and the elytra 
form an elongated and arched triangle(1). 
Bocypium, Lat. 
Where the elytra are wholly or mostly exposed, the posterior and 
scutellar prolongation of the prothorax being narrow and more or 
less lanceolate or spiniform(2). 
In the others, the scutellum is at least partially exposed, although 
the prothorax may be prolonged; the posterior extremity of the pro- 
thorax presents a transverse suture, which distinguishes it from the 
scutellum. 
Crntrotus, Fab. 
Such are the 
C. cornutus; Cicada cornuta, L. ; Panz., Faun. Insect. Germ., | 
L, 19. Length four lines; thorax furnished with a horn on each 
side, and prolonged posteriorly into a point as Jong as the ab- 
domen.—In the woods on Filices and other plants. 
C. geniste, Fab.; Panz., Ib., 20. But half the size of the 
cornutus, with its thorax simply prolonged Belematts te 
the Genistee(3). 
We will now pass to those species in which the head is ‘scarcely 
lower than the prothorax, or is level with it, and horizontal or but 
slightly inclined when seen from above; where the prothorax is nei- 
ther raised in the middle nor prolonged posteriorly, and at most 
only presents lateral dilatations; and where the mesothorax has the 
form of an ordinary sized and triangular scutellum. The elytra 
are always entirely exposed, and the posterior tibiz at least, oraye 
spinous. 
In several, such as the following, the thorax has the figure of an 
irregular hexagon; it is prolonged and narrowed posteriorly, and 
terminates by a truncation, so as to serve as a point d’appui to the 
base of the scutellum, and even frequently receiving it, this trun- 
cated part being concave or emarginated. 
fEration, Lat.—#talia, Germ. 
The Insects of this subgenus are distinguished from those of other 
—- 
(1) See Fab., Syst. Ryngot. g 
(2) The Centrotus horridus, trifidus, globularis, clavatus, claviger, Fab. 
(3) The C. cornutus, scutellaris, &c., Fab. 
