116 



CONTEIEUTIONS TO CANADIAN PALEONTOLOGY 



Somewhat distally below the middle of the wing, the m.edia furcates 

 into two slightly 'divergent branches. The posterior branch of the 

 cubitus passes to the lower margin in a steep curve, not reaching the 

 centre. The mediocubital cross-vein is situated two and a half times 

 as far above the radiomedial cross-vein as is the latter above the fork 



Fig. 22. — Penthetria avus, Handlirsch. 



of the media. Directly below the cubitus and parallel with it runs a 

 fold. The first simple anal vein diverges moderately from the cubitus. 



Penthetria lanibei, sp. nov. Fig. 23. 



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

 1906. L.M.L.). 



A subelliptical wing 11™" long, whose breadth is to its length in 

 the ratio of 1:2-5. The radius is nearly straight, and stretches 

 quite beyond seven-tenths the length of the wing. Its sector springs 

 off at one-fourth the length of the wing, is strongly sigmoid, and 

 bifurcates in half its own length. Its anterior branch is distinctly 

 curved, and fuses in the margin midway between the radius and the 

 posterior branch of the sector. The radiomedial crOss-vein is farther 

 removed from the origin than from the fork of the sector, and lies 

 almost precisely in the middle of the wing. Just below half the 

 length of the wing, the media separates into two moderately diver- 

 gent branches. The cvibitus with its posterior branch forms a gentle 



Fig. 23. — Penthetria lambei, Handlirsch. 

 curve, and strikes the posterior margin at half its length. The medio- 

 cubital vein lies three times as far above the radiomedial cross-vein 



