2.50 THOMAS SAY FOUNDATION 



Female. Genital opening not guarded by valves or 

 covered by a subgenital plate ; ninth abdominal sternite 

 produced into a wide evenly rounded plate. 



Type, female, No. 10052, May 31, 1915, Wenatchee, 

 Wash. (Newcomer, in Banks Coll., Mus. Comp. Zool., 

 Cambridge, Mass.). 



This is in all probability indentical with T. pacifica 

 Banks. 



Taeniopteryx pallida Banks. 



(Plate 46, fig. 11.) 

 1902. Nemoura pallida Banks, Can. Ent., 34:125. 

 1907. Nemoura pallida Banks, Cat. Neurop., p. 14. 



Length to tip of wings, female, 12 mm. Expanse, fe- 

 male, 21 mm. 



General color rusty brown, including the wings which 

 are infuscated with a reddish brown. 



Head reddish brown, not wider than prothorax ; a de- 

 pressed area between the hind ocelli ; occiput with fine 

 longitudinal broken lines ; hind ocelli about twice as close 

 to eyes as to each other ; antennae dark brown. 



Prothorax reddish brown; wider than long; widened 

 behind; angles rounded; sides convex; surface very 

 slightly rugose. Legs brown. Wings uniformly reddish ; 

 veins reddish brown ; subcosta does not reach the cord ; 

 about three costal crossveins before the end of subcosta 

 and one beyond. 



Abdomen dark brown. Cerci composed of five seg- 

 ments. 



Male, unknown. 



Female. Genital opening of eighth abdominal ster- 

 nite not guarded by valves or covered by a subgenital 

 plate ; ninth sternite produced into a wide evenly rounded 

 plate. 



Type, female, No. 11362, July 18, 1898, Little Beaver, 

 Colo. (Banks Coll., Mus. Comp. Zool., Cambridge, Mass.). 



Taeniopteryx occidentalis Banks. 



(Plate 33, fig. 3; plate 45, figs. 1, 2; plate 46, fig. 1.) 



1900. Taeniopteryx occidentalis Banks, Trans. Am. Ent. Soc, 24:244. 



Length to tip of wings, male, 11 mm.; female, 12-15 

 mm. Expanse, male, 18 mm. ; female, 20-25 mm. 



General color blackish with spotted wings. 



Head about as wide as prothorax; black with brown 

 beside the eyes, on the clypeus, and from each side of the 

 ocellar triangle a narrow brown mark towards the base 

 of the antennae ; a depressed area between the hind ocelli 

 and in this depression usually a small brownish spot; 



