318 TERTIARY INSECTS OF NORTH AMERICA. 



1. CERCOPIS SELWYNI. 



PI. 2, Figs. 14, 15. 

 Cercopis selwyni Scndd., Rep. Progr. Geol. Surv. Cau., 18/7-1878, 184B-185B (1879). 



A pair of nearly perfect tegmina, reverses of each other, represent a 

 species allied, but rather distantly, to the gigantic species of Cercopida 

 described by Heer from Radoboj. It differs from them all in neuration, in 

 the form of the costal border and of the apex. The portion of the wing 

 below the straight sutura clavi is broken away. The basal half of the 

 costal margin is strongly and rather uniformly arcuate, but more strongly 

 close to the base ; the apical half of the same is nearly straight ; the apical 

 margin is a little obliquely and roundly excised, gently convex, the tip 

 roundly angulated. The costal vein parts from the common trunk close to 

 the base and follows close to the margin, terminating at about one-third 

 way to the tip ; the radial vein is directed toward the middle of the outer 

 half of the costal border, until it forks, a little before the middle of the 

 wing, when both straight branches run subparallel toward the tip ; the 

 ulnar vein also forks once, half-way between the base and the fork of the 

 radial vein, and its straight branches, with those of the radial vein, subdi- 

 vide the outer half of the wing subequally, all being evanescent toward the 

 apical margin ; the sutura clavi reaches as far as these veins are visible. 



Length of wing, 16.5 mm ; breadth of wing at tip of sutura clavi, 5 mm ; 

 length of sutura clavi, 14 mm . 



Nine Mile Creek, British Columbia. One specimen, Nos. 64 and 65, 

 Dr. G. M. Dawson, Geological Survey of Canada. 



2. CERCOPIS ASTRICTA. 



PL 7, Fig. 15. 



Reverse and obverse of the greater part of one of the tegmina of a 

 much smaller insect than the preceding represent this species; no part of 

 the clavus is preserved nor even quite up to the sutura clavi. The costal 

 margin is very strongly convex, the curve being strong-est in the middle so 

 as to appear bent ; the apical area is equally full above and below, or only 

 a trifle the fuller above, the margin strongly convex. The costal vein 

 can not be made out, and the radial is almost equidistant from the margin, 

 and relatively only about half as far as in the preceding species, before it 



