PLECOPTEBA OF NORTH AMERICA 



165 



upon the tenth tergite ; supra-anal process not developed. 

 In cleared specimens there appear a pair of chitinized, 

 flattened, elongate, curved processes within segment nine ; 

 these processes bear a series of teeth on the outer edges 

 as shown in PI. 24, fig. 7. These processes, lying in the side 

 walls of the penis, evidently function in copulation. 



Female. Hind margin of eighth abdominal sternite a 

 little produced, with a broad median notch ; ninth ster- 

 nite each side with a rounded dark mark. 



Distribution.— May 23, 1900, Deer River, N. Y.; June 

 17, Sport Island, Sacandaga R., N. Y. (C. P. Alexander) ; 

 May 18-July 7, Ithaca, N. Y. ; July 15, Capens, Me. (C. W. 

 Johnson) ; June 16, Jord Pond, Mt. Desert, Me. (C. W. 

 Johnson) ; July 24, 1907, Alton, N. H. (J. A. Cushman) ; 

 Canobie Lake, N. H. (Geo. Dimmock) ; July,- Princeton, 

 Mass. (L. W. Swett) ; Apr. 29, Manchester, N. J. ; Elkhart, 

 Ind. ; June 28, Knoxville, Tenn. ; North Carolina. 



Genus PELTOPERLA Needham. 



1905. Peltoperla Needham, Proc. Biol. Soc. Wash., 18:107. 



1907. Peltoperla Banks, Cat. Neurop., p. 12. 



1916. Peltoperla Needham and Smith, Can. Ent., 48:S0. 



This genus includes spe- 

 cies varying from 9 mm. to 

 30 mm. in length. It is char- 

 acterized by the possession 

 of but two ocelli; by a short 

 head retracted under the 

 front of a v/ide prothorax; 

 long antennae ; and very 

 short caudal cerci that are 

 often hardly longer than the 

 abdomen is wide. 



General color brown to 

 blackish. 



Head narrower than pro- 

 thorax, yellowish to brown- 

 ish, usually with a diffused 

 spot over the middle area; 

 ocelli usually closer to eyes 

 than to each other ; seg- 

 ments of palpi increase in 

 length to the tip; antennae 

 long, darker towards the tip. 



Prothorax much wider than 

 long, mostly with broadly 

 flaring margins ; not widened 

 posteriorly ; front angles 



Fig. 23. 



Peltoperla cora Ndm. 

 & Sm. 



