HEMIPTERA. 177 



o 



Membbacis, Fah. 



Where the prothorax is elevated, compressed and foliaceous along 

 the middle of the back *. 



*^RAGOPA, Lat. 



Where that part of the body presents, on each side, a horn or 

 pointed projection without any intermediate elevation, and is pro- 

 longed posteriorly into an arched point of the length of the abdomen, 

 and replacing the scutellum f . 



There, the tibiae are of the ordinary form, or non-foliaceous. 



•-•'^Darnis, Fab. 



Where the posterior prolongation of the prothorax covers the top 

 of the abdomen almost wholly or for the greater part, and the elytra 

 form an elongated and arched triangle \. 



'BocYDiuM, 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 §. 



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 transvere suture, which distinguishes it from the 

 scutellum. -^ 



Centrotuh, Fab. 

 Such are the q 



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 long as the 

 abdomen. — In the woods on Filices and other plants. 

 '■^C. genistce, Fab. ; Panz., lb., 20. But half the size of the 

 cornutus, with its thorax simply prolonged posteriorly. — On the 

 Genistae ||. 



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 dilitations ; and Avhere the mesothorax has the form 

 of an ordinary sized and triangular scutellum. The elytra are al- 

 ways entirely exposed, and the posterior tibiae at least, always spinous. 



In several, such as the" following, the thorax has the figure of an ir- 

 regular hexagon ; it is prolonged and narrowed posteriorly, and ter- 



* The Membracisfoliaceus, Fab. 



t Membraces from the Brazil^ which appear to me to be analogous to the fol- 

 lowing species of GevmnTf^labrayalbimacula a.ni-\canthocephakt. 

 X See^Fab., Syst. Ryngot^ a O. O 



§ Th&'Centrotus hori-idusi-ri-ijidus, ^i^obuIariSyTlavatus, daviger, Fab. 

 il The C. cornuiuSf^culellaris, &c., Fab. 



