PLECOPTERA OF NORTH AMERICA 133 



rounded ; angles much rounded ; rugosities not very 

 strong; the groove in front and behind faintly continuous 

 on the ouTer margins ; meso- and metathorax dark brown 

 with a pale spot in front and pale in the middle above. 

 Legs, dark brown ; femora with a narrow transverse black 

 band at distal ends; first tarsal segment about twice as 

 long as second ; third segment longer than one and two to- 

 gether. Wings subhyaline ; area between costa and radius 

 beyond end of subcosta inf uscated. Veins, including costa, 

 dark brown. 



Abdomen dark brown, hairy, dark underneath. Cerci 

 or tails blackish brown, first segment about twice as long 

 as wide, the next few segments wider than long; seg- 

 ments beyond the middle about three times as long as 

 wide, hairy. 



Male. Ninth abdominal sternite produced, evenly 

 rounded behind and bearing a ventral appendage in the 

 form of a rounded knob ; from the base of the ventral ap- 

 pendage originate two divergent lines, the area between 

 these lines somewhat depressed ; tenth tergite partly 

 cleft, the hind margin each side of the middle beset with 

 small pegs; supra-anal process short, broad, upturned, 

 with a chitinized rim connected in the middle by a short 

 chitinous, transverse piece: remainder of supra-anal proc- 

 ess membranous ; subanal lobes triangular, unmodified. 



Female. Ventral plate very broad and triangularly 

 produced across segment nine, notched in the middle. 



Distribution. — Type, female, 10819, Kaslo, British Co- 

 lumbia, April 24 (Banks' Collection M. C. Z., Cambridge, 

 Mass.). One female, Redwood Canyon, Marin Co., Calif., 

 V-17-08 (E. C. Van Dyke) ; one female, "Sitcha" ; one 

 male, Terrace, B. C. (Mrs. W. W. Hippesley). 



Genus NEOPERLA Needham. 



1892. Pseudoperla Banks, Trans. Am. Ent. Soc, 19:322 (preoc). 



1905. Neoperla Needham, Proc. Biol. Soe. Wash., 18:108. 



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



1909. Neoperla Klapalek, Wien. Ent. Zeit., 28:216. 



1909. Ochthopetina Enderlein, Stett. Ent. Zeit.. 70:324. 



1923. Neoperla Klapalek, Coll. Zool de Selys, IV, 2:125. 



Medium sized brownish species, 10-18 mm. in length, 

 with two ocelli placed very close to each other; wings 

 lightly to heavily infuscated. 



Head wider than prothorax, yellowish to brown ; two 

 large ocelli, less than two diameters apart, surrounded by 

 a black ring or else both ocelli situated upon a black spot. 



Prothorax wider than long, narrowed behind ; front 



