PLECOPTERA OF NORTH AMERICA 



129 



Manitoba, Aweme, July 1, 1907 (N. Criddle). Nova 

 Scotia, Truro, July 4, 1913 (R. Matheson). 



Genus PARAPERLA Banks. 



1906. Paraperla Banks, Can. Ent., 38:222. 



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

 1909. Paraperla Enderlein, Zool. Anz., 34:390. 



Brown medium sized stoneflies, 11-17 mm. in length; 

 with a long head, a transversely oval prothorax and with 

 second anal vein of f orewing 

 branched. 



Head unusually long, a little wider 

 than prothorax ; length of head back 

 of eyes at least as great as the 

 length of the eye; ocellar triangle 

 covered by a brown wash which is 

 bounded behind by the occipital 

 sutures ; three small ocelli ; the hind 

 ocelli a little closer to each other 

 than to the eyes. 



Pronotum transversely oval ; wider 

 than long; all angles much rounded; 

 a narrow blackish groove runs all 

 around the margin ; surface slightly 

 rugose. Legs brown, tarsi blackish, 

 first and second tarsal segments 

 very short, sub-equal, third tarsal 

 segment at least twice as long as one 

 and two combined. Wings subhya- 

 line ; subcosta ends much before the 

 cord ; several costal crossveins be- 

 fore the end of subcosta as well as 

 beyond; second anal vein of fore- 

 wing branched ; anal field of hind 

 wings large ; stem of Rs-M in hind 

 wing very long. 



Abdomen brown ; cerci long, with 

 at least 18 segments. 



Male. Ninth sternite not much produced ; tenth tergite 

 cleft; supra-anal process upturned and largely membra- 

 nous; subanal lobes broadly triangular, not modified into 

 recurved hooks. 



Female. Subgenital plate large, much produced and 

 notched in the middle. 



Fig. 16. Paraperla 

 frontalis Bks. 



