THE CANADIAN ENTOMOLOGIST. 337 



l)eliind the eyes black ; basal part of antennne yellowish, beyond the sixth 

 joint blackish ; pronotum orange-yellow, a broad black mark each side, but 

 leaving the margins pale ; thorax and abdomen blackish, margins of 

 ventral segments and the last segment yellow ; setae yellowish, tip darker ; 

 legs yellowish, darker above on base of tibi?e, and the tarsi dark ; wings 

 distinctly yellowish, venation blackish, base of radius and median yellow- 

 ish. Head rather broad, eyes not very large, ocelli small, the triangle 

 broader than long, posterior ocelli nearer to eyes than to each other ; 

 pronotum short, slightly narrowed behind,* sides straight, corners sharp, 

 not very rugose above. Fore wings with two cross-veins beyond the end 

 of the subcosta, about eight cross-veins in both median and cubital series, 

 three branches to radial sector beyond anastomosis, in both specimens 

 there is a closed cell just beyond anastomosis, between radial sector and 

 median vein. 



Expanse, 34 mm. Two specimens from San Francisco, Cal. 

 Isoperla sordida, n. sp. — Dull yellowish, an indistinct V-mark con- 

 necting the ocelli ; a broad dark mark each side on the pronotum ; 

 antennie brownish on apical half; tips of tarsi brownish ; wings flavescent, 

 with entirely pale yellowish venation. Head rather broad, ocelli form 

 equilateral triangle, the posterior ocelli about as close to the eyes as to 

 each other; pronotum as broad behind as in front, sides barely convex, 

 quite rugose above ; setse short, not as long as the abdomen, the joints 

 short. Wings quite long, about three cross-veins beyond subcosta, several 

 costal cross-veins, radial sector forked once about one-third to one-half 

 svay out ; about six cross-veins in cubital and median series, radial sector 

 arising fully ore-half way to anastomosis. 



Expanse, 24 mm. One specimen from Los Angeles, California 

 (Hutchinson). 



Isoperla longiseta, n. sp. — Dull yellowish ; ocelli connected by black 

 V-mark ; anlennse dark beyond middle ; pronotum with faint dark mark 

 each- side, extreme margins pale ; lobes of thorax brown ; abdomen 

 yellow-brown ; seta? yellowish, darker on tips : tips of tarsi dark ; hind 

 tibise with a faint dark mark above near base ; wings hyaline, yellowish 

 on costal margin, venation pale, rather darker in middle and apical parts. 

 Ocelli form an equilateral triangle, the posterior ocelli a trifle nearer to 

 eyes than to each other ; pronotum only a little narrower behind than irj 



