592 TERTIARY INSECTS OP NORTH AMERICA. 



and ruus far past the forking of the fifth vein, fully two-thirds the way to 

 the margin of the wing ; the anal vein curves but gently, and appears to 

 vanish before reaching the margin of the wing. 



Length of wing, 3.5""°; breadth of same, 1.5°"". 



Quesnel, British Columbia. One specimen, No. 4 (Dr. G. M. Dawson, 

 Geological Survey of Canada). 



GNORISTE Meigen. 



Gnoriste dentoni. 



PI. 5, Figs. 6, 7. 



Gnoriste dentoni Scudd., Bull. U. S. Geol. Geogr. Surv. Terr., Ill, 755 (1877). 



A single specimen, a little broken, but otherwise in good preservation. 

 The head and thorax are nearly black, the abdomen dark fusco-castaneous. 

 Legs and base of antennae fuscous. Wings rather narrower at tip than in 

 the European G. apicalis Hoffm., hyaline, covered with microscopic hairs, 

 with a very slight and increasing infuscation toward the apex, the veins 

 testaceous, the co.stal and second and third longitudinal veins much heavier 

 than the others, and the fifth longitudinal vein with its lower fork scarcely 

 heavier than the veins about it. The extreme tip of both wings is broken, 

 so that the extent of the costal vein can not be seen ; but, in the approach 

 of the proximal end of the fork of the fifth longitudinal vein to the root of 

 the wing, the species agrees with the American G. megarhina O. S. more 

 than with the European species mentioned, for it lies scarcely farther from 

 the base than the transverse vein connecting the first and second longitudinal 

 veins, and slightly nearer than the separation of the third and fourth longi- 

 tudinal veins Only the basal four joints of the antennae are preserved ; 

 the basal joint is obconic, broadly rounded at the apex, nearly twice as long 

 as broad, the other three cylindrical, the second nearly half as long again 

 as broad, the third and fourth less than a third longer than broad. The 

 legs are profusely covered with hairs, but the hinder pair appear to be 

 spineless, except at the apex of the tibia and of each tarsal joint, where there 

 are three or four slender and rather short spines ; the claws are very small 

 and delicate, strongly curved and delicately pointed ; the short tibiae of the 

 front legs, however, have at least a single row of fine, distant spines on the 

 upper (?) edge. 



