124 BRITISH CICADA. 



three genera ; but the wings in JgalUa are shorter than 

 in Idiocerus. The male pygofer of the last genus also 

 shows a small genital valve. 



The male parts of Fcdiopsis tihialis are quite as com- 

 plex in structure as we see in Lihurnia : they are curious 

 objects under the microscope. The clavate antennaB 

 of the male Idioccri, it appears, are not peculiar to that 

 genus. 



TETTIGONIDiE. 



Frons gibbous. Clypeus very convex. Femora 

 with a pair of spines at their apices. Tibia3 multi- 

 spinose. 



Genus XXV.— TETTIGONIA, Geoff, 



Frons and clypeus very convex. Ocelli distinct, and 

 placed on the vertex near to the border of the pro- 

 notum. Hind femora with a pair of spines on the 

 upper side at the apex (omitted in the figures). 

 Elytra without a limbus, but with a strong apical 

 edge. 



Tettigonia viridis, Linn. Plate XXXYIL, 

 figs. 1 to 10. 



Cicada viridis, Linn. 



Tettigonia viridis, Germ.; Burm. ; Flor; Marsh.; 



Kirschb. ; Sahl. ; Edw. pt. ii. p. 15. 

 T. arimdinis. Germ. ; Burm. 

 Amhhjcephalus viridis. Curt. 

 Tettigonia fiavicatclla, Herkl. 



The male. Rather smaller than the female. Vertex 

 subgibbous, pale ochreous-brown, with a paler de- 

 pressed stripe down the middle, and two swollen 

 patches, covered with fine brown parallel striations, on 



