124 Proceedings of the Biological Society of Washington. 



A A. Clavus and frequently more or less of corium covered by pronotum. 



B. Wing with the terminal cc41 truncate at base.. Telamonini p. 126. 

 BB. Wing with the terminal cell angled at base. 



C. First sector of tegmen branching near middle; sub- 

 costal cell short ..Polyglyptini p. 130. 



CC. First sector branching near base; subcostal cell long 



Stniliini p. 128. 



CERESINI. 

 Key to the Genera. 



A. Pronotum with suprahumeral horns Ceresa p. 124. 



AA. Pronotum without suprahumeral horns. 



B. Anteapical cells mostly distinctly longer than apical; species 



chiefly greenish — Stictocephala p. 125. 



BB. Anteapical cells of about same length as apical; species chiefly 

 black, or black at least on top of pronotum. 

 C. Tegmen with five cells at ape.x, veins dark Acutalis p. 125. 

 CC. Tegmen with four cells at apex, veins hyaline 



Micrutalis p. 126. 



CERESA Amyot and Serville. 

 Key to the Species. 



A. Species with transverse color bands, especially noticeable near 

 posterior end of pronotal extension. 

 B. Femora with conspicuous brown to black bands or spots; 



color in general darker diceros. 



BB. Femora without dark markings; color in general paler 



albescens. 

 AA. Species without transverse bands. 



C. Horns projecting almost straight laterally, both as 

 viewed from above and from in front. 

 D. Smaller, front of pronotum distinctly hairy 



borealis. 

 DD. Larger, front of pronotum not hairy. ..biibalus. 

 CC. Horns noticeably curved either upward, backward or 

 both. 



E. Horns distinctly curved backward, 

 but not upward, front of pro- 

 notum convex brevitylus. 



EE. Horns curved both upward and back- 

 ward. 



F. Smaller, with more or less 

 purplish brown coloration, 

 horns more strongly curved, 

 genital segment of female 

 with a broad cleft, rounded 

 at bottom constans. 



