PLECOPTERA OF NORTH AMERICA 245 



Taeniopteryx nigripennis Banks. 



(Plate 45, figs. 7, 8; plate 46, fig. 4.) 

 1918. Taeniopteryx (Bhdbdiopteryx) nigripennis Banks, Bull. Mus. 

 Comp. Zool., 62, No. 1, p. 8. 



Length to tip of wings, male, 9-10 mm. ; female, 11-12 

 mm. Expanse, male, 16-19 mm. ; female, 19-21 mm. 



General color blackish with infuscated wings. Head 

 not wider than prothorax, blackish with brown inside 

 the eyes, in the depressed area between the hind ocelli 

 and in front of anterior ocellus ; occiput somewhat rugose ; 

 hind ocelli about twice as close to eyes as to each other. 

 Antennae blackish. 



Prothorax dark brown to black, with the margins 

 lighter in some of the specimens ; wider than long ; some- 

 what widened behind ; angles rounded ; surface somewhat 

 rugose. Legs dark brown to black. Wings lightly to 

 heavily infuscated. In the infuscated wings the base of 

 the wings is yellow, the yellow color extending from the 

 costal margin to cubitus and forward to the fork of Cul 

 and Cu2 ; subcosta does not reach to the cord ; one or two 

 costal crossveins before the end of subcosta and one be- 

 yond the cord. 



Abdomen dark brown, the ninth sternite of male yellow. 

 Cerci composed of six segments. 



Male. Supra-anal process short, erect, tapering to a 

 blunt point; subanal lobes asymmetrical, divided into 

 several membranous processes ; at the base of each cercus 

 a chitinous, raised, pointed process, curved at the tip and 

 membranous on the underside ; ninth abdominal sternite 

 prolonged into a truncate subgenital plate which reaches 

 beyond the tip of segment ten and bears long hair on the 

 hind margin; no ventral appendage or lobe on the sub- 

 genital plate. 



Female. Genital opening not guarded by valves or cov- 

 ered by a subgenital plate ; ninth abdominal sternite pro- 

 longed into a broad, rounded plate which reaches nearly 

 to the tip of the abdomen. 



Type, No. 10051, Wenatchee, Wash., May 21, 1915 

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

 Mass.) ; one male, one female, May 2, 1909, Parley Canyon, 

 Utah (E. G. Titus) ; two males, five females, Boulder, 

 Colo. (G. S. Dodds). 



