318 1 1 1 ill i INI \m -i i \i «»i I OMPAB \ i i\ i IQ&LO n . 



Pi i;l.\ \ linn iUS, sp. DOV. 



Type.— M. C. Z. 10,815. N. H.: Franconia (Mm. A. T. Soma . 



Brown; must of lower face and most of vertex back of ocelli pale yellowish 

 and even between posterior ocelli, only sides of bead back of eyei dark; n 

 median pale Btripe on the pronotum, broader in trout; ventral plate of female 



pale; legB and antennae pale brownish; wingB Dearly hyaline, veins brown: 

 radial sector two-branched, six median and cubital cross-veins; anastomoSM 

 continuous. Posterior ocelli much nearer to the eyes than to each othi 



ocellar triangle broader than lon&; lateral bosses about as near antenna] ridget 



as to the posterior ocelli; pronotum one and one half broader than long, -id<- 

 nearly parallel, front and hind margins both convex; female ventral plate verv 

 large and long. 

 Expanse 30 mm. 



Near to P. modesta of Colorado, but it is smaller and the ventral 

 plate much longer. 



Perla INCESTA, sp. DOV. 



Type.— M. C. Z. 10,838. Oregon (Hagen coll.). 



Brown; in general similar to P. varians, P. similis etc. in having a narrow 

 median stripe of pale on the pronotum, and a pale median spot on top of the 

 head, and a pale spot each side on lower face; abdomen brown, pale on venter 

 near tip, setae and legs pale. Wings also similar to these species, nearly 

 hyaline, with yellowish venation, radial sector three-branched, three cross- 

 veins beyond end of subcosta, latter ending at anastomosis, latter disjointed, 

 six to eight median and cubital cross-veins, first anal vein strongly sinuate 

 just beyond the anal cell. The posterior ocelli are nearly twice as near to eyes 

 a- to each other, the ocellar triangle almost twice as broad behind as long; 

 lateral bosses small and as close to antennal ridges as to posterior ocelli. Pro- 

 notum one ami one fourth broader than long, sides nearly parallel. 



Expanse 30 mm. 



It differs from all the related forms in the shape of the ventral 

 plate which is nearly straight across at tip with a distinct median 

 emargination. 



Perla ana.m k.nsis, sp. now 



Type.— M. C. Z. 10,830. Anam (Frustorpher). 



Pale yellowish, a large black spot over the ocellar area; pronotum and rest 

 of thorax rather brownish; wings nearly hyaline, veins yellow; legs pale, 

 femora tipped with dark. Ocelli large, posterior ocelli plainly closer to each 



