47 



of oiniiiiiontatiou ; but, as lias been remarked, color and. oruaiuea- 

 tation have but little value in separating the species of Tettix. 



Tkttix cucullatus. Scudder. 



Vertex at the front border smaller than across the middle of the 

 prominent e^'es. Testaceous-fuscous, gi-anulose. Pronotum dilated 

 in front, advanced upon the head to the eyes. Length, nearly 

 half an inch. 



It differs from T. granulatus, which it most resembles, in having 

 the vertex very narrow, slightly less than the diameter of the 

 much-inflated eyes, the front cut off square, and slightly hollowed, 

 not projecting outward so far as the eyes. The pronotum is 

 broader and more compact over the thorax, more suddenly sloped 

 off behind, and extending backward nearly twice the length of the 

 abdomen, the wings overreaching slightly. The punctures on the 

 wing covers not so deep. 



Tettix triangularis. Scudder. 

 Allied to 2\ oriiatus, and agreeing with it in ornamentation, in 

 the character of the vertex and prominence of the eyes, but dif- 

 fering in the length of the pronotum and wings. As in both of 

 the preceding species, the pronotum and wings are of equal length, 

 but in this species the pronotum is scarcely longer than the body, 

 and is not produced backward into such a slender point, the sides 

 being straighter. Length, three times the breadth ; length of pro- 

 notum, .17 of an inch. 



Genus Tkttigidea. Scudder *(18(!2). 



More robust and clumsy than Tettix, head larger, more swollen 

 upon the top, and less sloping down the front ; antennae consisting 

 of twehtyrtwo joints, which are cylindrical and not flattened. The 

 hnVer anterior angle of the sides of the pronotum, which is angu- 

 lated and bent inwards in Tettix, is here rounded and straighter ; 

 the lateral carinie are not so prominent as there, or so strongly 

 bent inwards in advance of the broader portion ; the front l)order 

 is thrust forward at an angle p:iiti:illy concealing the head. 

 Wing covers considerably longer and narrower than in Tettix. 

 This genus further differs from Tettix, in having a small circular 

 space, without facets, set off from the upper, inner border of the 

 eye. 



The species may be separated as follows : — 



r Pronotam extending beyond the end of tlie abdomen . . lateralis. 



{ Pronotum not extending beyond tlic end of tlie abdomen . pol>jmnrpkn. 



