250 TERTIARY INSECTS OF NORTH AMERICA. 



angle than does the second oblique ; unfortunately the tip of the wing is 

 broken, and more than the apical half of the outer border is also wanting. 



Length of fragment, 4""°; estimated length of wing, 5°"°; width of 

 same, 1.65""". 



Quesnel, British Columbia. Dr. G. M. Dawson. One specimen. No. 19. 



4 SBENAPHIS gen. nov. (a/iavvv/ii, Aphis). 



Head without frontal tubercles, the front transverse. Antennae very 

 slender, at least nearly as long as the body. Fore wings with the stig- 

 matic vein arising from the middle of the stigma. Cubital vein twice forked, 

 the first time at a moderate distance from its origin, which is at or a trifle 

 outside the middle of the space between the first oblique and stigmatic veins, 

 the second time opposite or scarcely beyond the base of the stigmatic vein. 

 Second oblique vein arising nearer the first oblique than the cubital vein 

 but at varying relative distances, always close to the first oblique vein, the 

 first discoidal cell between them being four or five times broader on the 

 hind margin than at base. Legs slender, varying in length but shorter than 

 the fore wings. Abdomen ovate. Some specimens seem to show a short 

 stout Cauda, which others appear to lack, and occasionally short cornicles 

 may be detected which are apparently of uniform diameter. 



Table of the species of Sbenaphis. 



Second oblique vein arising midway, or about midway, between tbe tirst obliqae and cubital veins. 



1. S. qnesneli. 

 Second oblique vein arising much nearer the first oblique than the cubital vein. 



Base of second discoidal cell twice as wide as that of the first; cubital vein running barely nearer 



the stigmatic than tbe second oblique vein 2. S. ithleri. 



Base of second discoidal cell nearly thrice as wide as that of the first; cubital vein running very 

 much closer to the stigmatic than to the second oblique vein 3. S. lassa. 



Sbenaphis quesneli. 



PI. 2, Figs. 4, 5 ; PI. 18, Fig. 12. 

 iacA««« gitesneJi Scudd., Rep. Progr. Geol. Surv. Can., 1876-77, 461-462 (1878). 



The oi'iginal description, with certain omissions and changes to corre- 

 spond with the phraseology here employed, was as follows: 



The remains which are preserved are a pair of overlapping front wings 

 with torn edges, but with all the important parts of the neuration, and some 

 of the veins of the hind wings. The body is completely crushed and all 



