590 TERTIARY INSECTS OF NORTH AMERICA. 



TRICHONTA Wirmertz. 

 TRICHONTA DAWSONI. 



PI. 3, Figs. 12, 13. 



Trichonta dawsoni Scudd., Rep. Progr. Geol. Surv. Can., 1875-1876. 272 (1877). 



A very well preserved though fragmentary specimen must unquestion 

 ably be referred to this genus, and is named for its discoverer. The greater 

 part of one wing, the basal half of the other, including between them all 

 the characteristic parts of the neuration, with crushed fragments of the thorax 

 and abdomen, make up the remains of the creature. The veins of the wing 

 are black, especially the upper ones, which are heavily marked ; the wing 

 is covered with microscopic hairs, and slightly infuscated throughout, but 

 on the apical quarter becomes dark fuliginous. The neuration agrees in 

 every particular, to the minutest degree, with the figure of Trichonta given 

 by Winnertz, excepting that the fifth longitudinal vein forks considerably 

 nearer the base, and the sixth longitudinal vein extends farther into the mid- 

 dle of the wing. 



Estimated length of wing, 4.75 mm ; breadth of same, 1.85 mm . 



Quesnel, British Columbia. One specimen, No. 6 (Dr. G. M. Dawson, 

 Geological Survey of Canada). 



RYMOSIA Winnertz. 



R.YMOSIA STRANGULATA. 

 PL 10, Fig. 2. 



A single specimen in which most of the legs and one wing, of which 

 the apex is lost, is all that remains of this species. Unfortunately the draw- 

 ing is incorrect in two particulars : the transverse median vein which is at 

 about the middle of the fragment, and is very obscurely preserved, is not 

 given ; and the stalk of the upper discoidal vein is scarcely half so long as 

 represented, although the fork of the lower discoidal vein is still nearer the 

 base. The cubital vein, which must terminate rather far above the apex of 

 the wing, is not in the least bent at the transverse median vein. The legs 

 are hairy and tolerably well though delicately spined. 



Probable length of wing, 3 mm . 



Green River, Wyoming. One specimen, No. 11 (Dr. A. S. Packard). 



