PLECOPTERA OF NORTH AMERICA 219 



Subanal lobes entire, modified into slender processes 

 which are armed near the tip with two sharp triangular 

 spines ; cerci long, chitinized, bent inward and ending in a 

 sharp point ; supra-anal process very wide, curved upward 

 and (side view) bifurcate at tip ; subgenital plate arising 

 from about the middle of the ninth sternite, narrow, 

 divided at the tip, each half serrate on the outer margin ; 

 ventral lobe nearly three times as large as wide. 



Female, unknown. 



Holotype, male, June 8, 1921, Bar Harbor, Me. (C. W. 

 Johnson) ; one male, June 3, 1920, Cranberry Lake, N. Y. 

 (C. J. Drake, in Cornell University Collection). 



Nemoura prolongata Claassen. 



(Plate 39, figs. 7-10.) 

 1923. Nemoura prolongata Claassen Can. Ent., 55:289-290. 



Length to tip of wings, male, 7.3 mm. ; female, 8.3 mm. 

 Expanse, male, 12.5 mm. ; female, 14.5 mm. 



General color dark brown. Head very much wider than 

 prothorax, nearly uniformly brown, rather thickly clothed 

 with short hairs, hind ocelli closer to eyes than to each 

 other. Prothorax dark brown, somewhat lighter toward 

 the lateral margins; little wider than long; hardly nar- 

 rowed behind; angles rounded. Legs uniformly brown. 

 Wings uniformly subhyaline. Gills aparently absent. 



Male. Subanal lobes undivided and prolonged into long, 

 slender, somewhat membranous processes; supra-anal 

 process turned up but not recurved, very complex, the 

 outer lobes membranous and armed with spines, the cen- 

 tral portion chitinized and armed with large .spine-like 

 processes ; cerci very long, chitinized and bent upward and 

 inward; subgenital plate narrow, very long and curved 

 upward ; ventral lobe narrow, at least three times as long 

 as wide. 



Female. Seventh sternite produced into a subgenital 

 plate, reaching across the eighth sternite ; genital opening 

 not guarded by valves. 



Holotype, male, June 26, 1913, Bretton Woods, N. H. 

 (C. W. Johnson) ; allotype, female, Orono, Me. (Cornell 

 University Collection) ; one male, one female, Orono, Me. 



Nemoura rotunda Claassen. 



(Plate 39, figs. 11-14.) 

 1923. Nemoura rotunda Claassen, Can. Ent., 55:290. 



Length to tip of wings, male, 7-7.5 mm. ; female, 10-11 

 mm. Expanse, male 11-12 mm. ; female 14-15 mm. 



