171 

 Jewett: Plecoptera 



Fig. 6:32. Male terminalia of Toeni'opferyx maura in lateral 

 view (Needham and Claassen, 1925). 



Fig. 6:33. 

 ;a, grinnelli; fa, 

 Sam and Claas 



„!.'».., 



mgripennis; 

 sen, 1925). 



of Brachyptera in lateral view. 

 zalifomica; d, occidentalis (Need- 



Fig. 6:34. Male terminalia of Brachyptera. a, pallida, dorsal 

 view; fa, pacifica, dorsal view; c, vanduzeei, dorsolateral view; 

 d, raynoria, dorsolateral view (o, Ricker, 1943; fa, Needham and 

 Claassen, 1925; c,d, Claassen, 1937b). 



male 9th tergite often produced into 2 rounded mem- 

 branous knobs; 9th sternite of female with a narrow 

 rearward extension the sides of which are broadly 



concave; eastern North America 



(subgenus Strophopteryx Frison 1929) 



— Subgenital plate of male curved upwards gradually, if 

 at all; hind margin of the male 9th tergite without lobes, 

 though often sinuate; 9th sternite of female produced 

 into a broad extension the sides of which are convex, 

 at least beyond the middle, or in one case notched 

 (B. raynoria) 2 



2. Subanal lobes of male in 2 parts, the upper part a 

 sclerotized prong pointing mostly inward, the lower 

 mostly membranous and asymmetrical; costal field of 

 fore wing with no cross veins between the basal one 

 and the end of Sc in C, nor beyond the cord; 10th 

 tergite of male not produced into lobes; northeastern 

 North America and Utah 



(subgenus Oemopteryx Klapalek 1902) 



— Subanal lobes consisting of mostly membranous and 

 asymmetrical parts only; costal field with 1 to several 

 cross veins before the cord, and 1 or more beyond it; 

 10th tergite usually produced into lobes or processes 

 3 



3. A median keel present near the end of the subgenital 

 plate; 10th tergite with 2 processes, each very narrow 

 at the base, broad and with 2 sharp corners at the tip 

 (fig .6:334); Cu, in the fore wing with 4 or 5 branches; 

 British Columbia to Oregon, Montana, and Colorado 

 (subgenus Uoddsia 



Needham and Claassen 1925) occidentalis (Banks) 1900 



