iy8 TERTIARY INSECTS OF NORTH AMERICA: 



broad and only slightly broader apically than basally. The apex is slightly 

 pointed and the outer margin apparently slopes more rapidly below than 

 above the apex. Though not shown in the plate, the subcosta is united 

 near the tip to the costa by a cross- vein, and just below the apical cell thus 

 formed the radius has a well-marked distinct arch. The cross-vein closiiif 



O 



the cell is not shown in the plate, nor the cross-vein just below it, into 

 which, rather than directly into the cubitus, the first nervule below the 

 lowest branch of the sector runs. The lower cross-veins also do not appear 

 on the plate ; they run, as in the modern Phryganea grandis, with a slight 

 jog where they cross the basal branch of the upper cubital, obliquely from 

 the base of the second branch of the upper cubital toward the arculus. 

 Indeed, the venation of the lower half of the wing closely resembles that 

 of the modern European P. grandis, which is slightly larger than the fossil 

 species. This differs from that in only one or two points ; the first apical 

 sector parts from its stem at the middle of the discoidal cell, the lower bor- 

 der of the cell is as full as the upper, and the cell itself is proportionally 

 shorter. 



Two other specimens agreeing in neuration with the preceding, but 

 with the lower nervule of the upper branch of the superior cubitus forked 

 represent females. Like the male they are represented only by upper 

 wings, one of them perfect, the other broken squarely at the tip by the 

 breaking of the stone in quarrying ; one is a little lighter in color than the 

 male, and, as it were, bleached out at the apex, while the other is much 

 darker, almost of a blackish chocolate, many of the minute spots of the 

 mottling, especially in the upper part of the wing, appearing quadrate rather 

 than circular. The fourth (female) fork is nearly as deep as the third, ex- 

 tending slightly more than half-way to the base of the branch. 



Length of wing, $ 20.25 mm , ? 19.5"; of discoidal cell, <? ? 5.5 mm ; 

 breadth of wing, <? 7 mm , ? 7.3 mm . 



Florissant. Three specimens, Nos. 407 (<?), 1016, 3897 (?). 



LIMNOPSYCHE gen. nov. (A//^/, 



This name is proposed for a genus which differs somewhat remarkably 

 from any Phryganidse, but which agrees at the same time in its main fea- 

 tures with the subfamily of Phryganida> proper. In his monograph on the 

 Trichoptera of the European fauna, Mr. McLachlarr lays much stress on 



