118 CONTRIBUTION'S TO CANADIAN PALEONTOLOGY 



strongly-curved anterior margin, and a still more arched posterior 

 border. Their breadth and length are in the ratio of 1:2-3. The 



Fig. 25. — Penthetria transitoria, Handlirsch. 



radius is nearly straight, and reaches more than seven-tenths the 

 length of the wing. The sector arises immediately below the first 

 fourth of the length of the wing, is gently arcuate, and just distal to 

 half its own length sends off an oblique indistinct anterior branch 

 toward the end of the radiuis. The radiomedial cross-vein lies in the 

 centre of the wing, and nearly twice as far from the origin as from 

 the bifurcation of the sector. Quite a distance below the middle of 

 the wing, the media separates into two strongly divergent branches. 

 The cubitus is relatively gently curved, and with its posterior branch 

 reaches the middle of the posterior margin. Behind it may be seen 

 a distinct divergent fold and an equally divergent anal vein. The 

 mediocubital vein is isituaited twice as far above the radiomedial vein 

 as is the latter above the furcation of the media. In the costal region 

 the wing was very opaque. 



Penthetria canadensis, sp. nov. Kg. 26. 



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

 1906. L.M.L.). 



This form consists of two wings pertaining to one individual. 

 The wings are 10™™ long, with slightly arched anterior border, and 

 strongly curved posterior margin. The breadth 'and the length are 

 in the proportion of 1:2-2. The radius curves gently toward the 

 anterior margin, and extends seven-tenths the length of the wing. 

 Its sector springs forth just below the first fourth of the length of 

 the wing, and separates into two branches directly above half its own 

 length ; the anterior of these is strongly and simply curved, is widely 

 divergent, 'and strikes the margin decidedly nearer to the radius than 

 to the posterior branch. The latter is strongly curved. The radio- 

 medial cross-vein lies somewhat above the centre of the wing, and 

 only half as far from the furcation as from the origin of the sector. 

 Just below the middle of the wing the media divides into two 



