PLECOPTERA OF NORTH AMERICA 239 



Females. 



1. Hind margin of ninth abdominal sternite pro- 



duced into narrow or broad yellow plate-like 



appendage 2 



Hind margin of ninth abdominal sternite little, 

 if at all, produced — never in the form of a plate- 

 like appendage 



T. (Nephelopteryx) maura, parvula, nivalis 



2. Ninth abdominal sternite with a narrow, triangu- 



lar tongue-like appendage 



T. (Rhabdiopteryx) fasciata 



Ninth abdominal sternite with a broadly rounded 

 plate-like appendage 3 



3. Wings spotted, hind margin of eighth abdominal 



sternite partly cleft T. (Doddsia) occidentalis 



Wings not spotted, hind margin of eighth abdom- 

 inal sternite straight T. (Taenionema) pacifica, 

 nigripcnnis, pallida, banksci, californica 



Taeniopteryx maura Pictet. 



(Plate 33, fig. 4; plate 44, figs. 5, 6; plate 46, fig. 7.) 

 1842. Nemoura maura Pictet, Ins. Neur., p. 381. 

 1861. Taeniopteryx maura Hagen, Syn. Neur. N. A., p. 35. 

 1892. Taeniopteryx maura Banks, Cat., p. 342. 

 1904. Taeniopteryx maura Banks, Proc. Ent. Soc. Wash., 6:205. 

 1907. Taeniopteryx maura Banks, Cat. Neur., p. 14. 



Length to tip of wings, male, 8-10 mm. ; female, 11-12 

 mm. Expanse, male, 14-17 mm. ; female, 20-22 mm. 



General color brown to blackish. 



Head slightly wider than prothorax, brown ; a depressed 

 area between the hind ocelli ; occiput quite rugulose ; hind 

 ocelli only about two diameters distant from the eyes; 

 antennae brown, composed of about 58-60 segments. 



Prothorax brown, lighter on the lateral margins, and 

 often a light median longitudinal line so that the prono- 

 tum appears light brown with two longitudinal dark lines ; 

 wider than long, a little widened behind ; angles narrowly 

 rounded; surface quite smooth. Legs brown; the hind 

 femora of the male with a stout downward pointing tooth 

 on the underside near the middle ; wings hyaline, or 

 slightly inf uscated ; subcosta has a tendency to run into 

 costa near the tip before it turns down to radius ; sub- 

 costa does not reach to the cord ; ordinarily no costal 

 crossveins either before or beyond the tip of Sc ; usually 

 not more than 7 or 8 cubital crossveins in the forewing. 



Abdomen brown, often a median light longitudinal line, 



