PLECOPTERA OF NORTH AMERICA 119 



berta, Can., J. McDunnough ; 3 females, July 4, 1908, 

 Emerald Lake, Can. Rockies (J. C. Bradley) ; 1 female, 

 July 19, 1908, Prairie Hills, Selkirk Mts., B. C. (J. C. B.) ; 

 1 female, Aug. 23, 1902, Laggan, B. C; 1 female, March 

 1923, Terrace, B. C. (Mrs. W. W. Hippisley) ; 1 female, 

 July 1-3, 1913, Maligne Lake, Alberta, Can. ; 1 female, 

 July 12-18, Carbonate to Prairie Hills, B. C. (J. C. B.) ; 

 1 female, June 24, 1920, Nanaimo, B. C. (E. C. Van Dyke) ; 

 1 male, April 11, 1898, Seattle, Wash. (Kincaid) ; 1 female, 

 June 15, 1897, Olympia, Wash. (Kincaid) ; 2 males, 2 fe- 

 males, Aug. 15, 1908, Three Bros. Mts., Olympic Range, 

 Wash. (J. C. B.) ; 3 females, May 15-19, Felton, St. Cruz 

 Mts., Calif. (J. C. B.) ; 3 females, May 26, 1903, Field- 

 brook, Calif. (H. S. Barber) ; 1 female, April 18, 1920, 

 Beron Valley, Marin Co., Calif. (C. L. Cox) ; many males 

 and females, Boulder, Colo. (G. S. Dodds) ; 1 male, Au- 

 gust 27, South Park, Colo. (Oslar) ; 1 female, July 22, Ge- 

 neva Park, Grant, Colo. (L. O. Jackson) ; 1 female, July 

 24, Geneva Park, Grant, Colo. (F. C. Jackson) . 



Alloperla fidelis Banks. 



(Plate 21, figs. 8, 9, 10.) 

 1920. Alloperla fidelis Banks, Bull. Mus. Comp. Zool., 64:323. 



Length to tip of wings, male, 9-11 mm.; expanse, male, 

 15-18 mm. Length to tip of wings, female, 11-14 mm. ; 

 expanse, female, 18-23 mm. 



General color greenish yellow, pronotum with a narrow 

 black border and with the rugosities usually brown. 



Head slightly wider than prothorax; yellow with the 

 clypeus slightly infuscated and the area back of the eyes 

 sometimes a little darker ; a black ring around the ocelli ; 

 lateral tubercles and frontal ridge also a little darker as 

 a rule; hind ocelli very little closer to the eyes than to 

 each other. Antennae yellow at base, fuscous beyond. 



Prothorax transversely oval, nearly twice as wide as 

 long ; yellow with a narrow dark brown or blackish border, 

 which in some specimens is restricted mostly to the lat- 

 eral margins of the pronotum ; surface moderately brown 

 with longitudinal interrupted lines. Legs yellow, tarsi 

 darker. Wings greenish hyaline, veins greenish. Ab- 

 domen yellow, with a broad median dark dorsal band. 

 Cerci yellow, somewhat infuscated towards the tip. 



Male. Near the anterior margin of the ninth abdomi- 

 nal tergite a transverse raised chitinous tubercle which is 

 broadly emarginate at the tip ; tenth tergite broadly bifid, 

 with a median depressed area; supra-anal process re- 



