PLECOPTERA OF NORTH AMERICA 



131 



median fleshy lobe with a shorter lobe each side ; basally 

 the supra-anal process is attached to a black chitinous 

 base from which originate two rearward divergent, dark 

 chitinous bands which curve downward at the tip; sub- 

 anal lobes broadly triangular and not developed into re- 

 curved hamules. 



Female. Subgenital plate large, normally nearly cover- 

 ing the ninth sternite, triangularly notched in the middle. 



Distribution.— Type, male, May 30, 1892, Beulah, N. 



Mex. (Banks' Collection, 

 Zoology, Cambridge, Mass.). 

 a female, July 11, Beulah, N. 



Museum of Comparative 



In Banks' collection is also 



Mex. One male, one female, 



Reno, Nev., 1878 (Morrison) ; one male, one female, Boul- 

 der, Colo. (G. S. Dodds) ; two females, May 2, Logan, 

 Utah; one male, May 29, 1909, Salt Lake City, Utah (E. 

 G. Titus) ; one female, August, 1913, Beaver Creek, Mont. 

 (S. J. Hunter) ; one female, Aug. 2, 1915, Rattlesnake Cr., 

 Tulare Co., Calif., 9,000 ft.; one female, May 8, 1921, 

 Steven's Creek Gorge, Santa Clara Co., Calif. 



Genus KATHROPERLA 

 Banks. 



1920. Kathroperla Banks, Bull. 

 Mus. Comp. Zool., 64:315. 



Length, 20-24 mm. ; 

 brown and yellow mark- 

 ings, transversely oval 

 pronotum with broadly 

 rounded corners ; elongate 

 head. 



Head very long; about 

 as wide as prothorax; com- 

 pound eyes small ; three 

 ocelli, forming an equilat- 

 eral triangle ; hind ocelli 

 about as close to eyes as 

 to each other; the length 

 of head behind the eyes 

 equals at least half the 

 length of entire head; 

 antennae dark, first and 

 second segments of about 

 equal length ; palpi dark, 

 slender. 



Prothorax wider than 

 long, transversely oval, 

 with a yellow median 

 stripe and with some yel- 



Fig. 17. Kathroperla perdita Bks. 



