nandlirach] ^ - ^ 



CANADIAN FOSSIL INSECTS 121 



Penihetria platypiera, sp. nov. Fig. 29. 



Locality: Horsefly mine — (July 20, 1906. L.M.L.). 



A large very heavily b^uilt insect, with broad wings of Bubellip- 

 tical form, slightly curved lanterior margin, and strongly arched 

 posterior border, and with broadly rounded off apex. The radius 

 extends seven-tenths the length of the wing and is only very gently 

 curved. Its sector issues at the termination of the first third of the 

 length of the wing, is very gently arcuate, and bifureateis in haU its 

 own length. The anterior branch is iiot widely divergent, (although 

 it is strongly curved and relatively long, and fuses in the margin 

 equidistant from the radius and the posterior branch. The radio- 

 medial cross-vein is sitHiated some distance below the ceiitre of the 

 wing and three times fes far from the base as from the fork of the 

 sector. The media forms a relatively short but widely divergent 

 bifurcation. The cubitus is very strongly curved, but fuses in the 

 posterior margin just below the middle. The anal vein dichotomizes 

 in half its own length. The mediocubital cross-vein is somewhat 

 more than twice as far removed from the radiomedial cross-vein as 

 is the latter from the furcation of the media. The entire wing is 

 strongly pigmented, and is especially opaque tjjward the anterior 



margin. 



I — < 



Fig. 29.— Penthetria platyptera, Ilandlirsch. 



In addition to the foregoing speci«s, which comprise 24 examples 

 in all, there are 12 other specimens in the collection that undoubt- 

 edly belong in the genus Penthetria, yet are too imperfectly pre- 

 served to render the species sufficiently characteristic for identifica- 

 tion. Eighteen other examples are certainly bibionids, and it is 

 highly probable that all belong to the genus Penthetria, so that of 

 the whole number of Y3 insects, 54 may pertain to this bibionid 

 genus Only one form belonging to this family was hitherto known 

 from thite region, namely, Penthetria simUhameena, Scudder, from 



