Handlirsch] 



CANADIAN FOSSIL ISTSECTS 



115 



neuration of the wings. The latter are 8-5""" long, broadly rounded 

 at the apex, and somewhat narrower in the basal than in the apical 

 portion. The breadth is to the length as 1: 2-6. In the apical haK 

 of the wing, the anterior margin curves strongly downward. The 

 radiua runs out nearly straight, and extends scarcely seven-tenths 

 the length of the wing. The sector arises immediately above the 

 first third of the length of the wing, and at about half its own length 

 divides into two branches, the anterior of which bends upward in a 

 nearly sigmoid curve, while the posterior is broadly arcuate, so that 

 both branches are strongjy divergent, and take quite different direc- 

 tions. 



Fig. 21. — Penthetria avunculus, Handlirsch. 



Penthetria avus, sp. nov. Fig. 22. 



Locality: Tulameen river, opposite Vermilion cliff — (August 6, 

 1906. L.M.L.). 



This wing is 10™" long, the breadth to the length being about as 

 1:2-6. The anterior margin is strongly curved, the apex not broadly 

 rounded. Toward the end the radius is slightly bent, and reaches 

 seven-tenths the length of the wing; its sector issues just below the 

 first quarter of the length of the wing, is distinctly sigmoid, and forks 

 quite a distance above half its own length. Its rather long anterior 

 branch is not widely divergent, and follows a course similar to that 

 of the posterior branch, fusing about midway between the radius and 

 fhe posterior branch of the sector. The radiomedial cross-vein is 

 about twice as far removed from the origin as from the furcation of 

 the sector, and lies somewhat above half the length of the wing. 



