PLECOPTERA OF NORTH AMERICA 259 



tennae blackish. Prothorax wider than long; slightly 

 widened behind; angles rounded; surface slightly rugose 

 in the median region. Legs blackish brown. Wings sub- 

 hyaline; R of forewing sinuate at the origin of Rs; Sc 

 ends before the cord; stem of Rs-M in hind wing about 

 one-sixth the length of Rs before the cord. Cerci com- 

 posed of about 16 segments (tips probably broken off) . 



Male. Abdominal tergites without any knobs or proc- 

 esses except the seventh which has a very slight indica- 

 tion of a small median knob; eighth and ninth tergites 

 with a slight median depression; tenth tergite bifid; su- 

 pra-anal process recurved, slender and very long, normal- 

 ly reaching to seventh tergite ; subanal lobes broadly tri- 

 angular and terminating in short spine-like processes; 

 ninth sternite slightly produced and evenly rounded. 



Female, unknown. 



This species is very closely related to C. grandis Banks, 

 but is only about one-third as large. 



Holotype, male, April 28, 1907, Aweme, Man. (N. Crid- 

 dle, in Cornell University Collection) . 



Capnia grandis Banks. 



(Plate 48, fig. 6.) 

 1908. Arsapnia grandis Banks, Can. Ent., 37:329. 



Length to tip of wings, male, 15 mm. Expanse, male, 

 25 mm. 



General color black with wings lightly infuscated. 



Head jet black, very little wider than prothorax, a de- 

 pression behind the ocellar triangle; entire surface of 

 head rather rugose; covered with fine pile; a depressed 

 triangular area each side of the front ocellus ; ocelli form 

 a triangle whose base is a little longer than the sides ; hind 

 ocelli more than twice as close to eyes as to each other. 

 Antennae and palpi black. 



Prothorax uniformly black, very little narrower than 

 head, not narrowed behind, front and hind margins and 

 sides straight. All angles rounded. Rugosities few but 

 well marked, smooth and shiny; surface covered with 

 fine pile. Legs blackish brown; tibiae a little lighter. 

 Wings uniformly slightly infuscated, veins brown; Sc 

 reaches to the cord; R not sinuate at origin of Rs; Rs 

 comes off of R gradually ; five to six costal crossveins be- 

 fore the end of Sc. Rs and M of hind wing with very short 

 basal stem. 



Abdomen blackish brown, somewhat lighter at base, 

 covered with fine pile. Cerci or tails brown at base, 



