PLECOPTERA OF NORTH AMERICA 123 



Distribution. — Type, female, No. 11355, May, Black 

 Mountains, N. C. (Banks Coll., Mus. Comp. Zool., Cam- 

 bridge, Mass.). Paratypes, males and females, same lo- 

 cality (Banks Coll.) ; males and females, May 18, 1923, 

 Ithaca, N. Y. ; one male, one female, May 13, Clinton, N. 

 Y. (P. B. Powell) ; one male, May 21, 1922, Enfield Falls, 

 Ithaca, N. Y. ; one male, May 27, 1922, Ithaca, N. Y. ; one 

 male, June 22, Niagara Falls, N. Y. ; two females, July 11, 

 1917, Cranberry Lake, N. Y. (C. J. Drake) ; two males, 

 one female, May 23, Newport, N. Y. ; two females, June 

 28, Bashbish Falls, Mass. (C. W. Johnson) ; two males, 

 May 26, Walpole, Mass. (C. W. Johnson) ; one male, 

 one female, 1908, Millsville, N. S. 



Alloperla lineosa Banks. 



(Plate 20, figs. 10, 11.) 

 191S. Alloperla lineosa Banks, Bull. Mus. Comp. Zool., 62:7. 



Length to tip of wings, male, 8 mm. ; expanse, male, 13 

 mm. ; length to tip of wings, female, 8.5-9 mm. ; expanse, 

 female, 14-15 mm. 



General color pale yellow with a narrow median dark 

 line on pronotum. 



Head about as wide as prothorax; pale yellow; hind 

 ocelli very little closer to the eyes than to each other ; an- 

 tennae pale yellow, slightly infuscated towards the tip. 



Prothorax pale yellow with a median narrow dark line 

 which follows the transverse groove somewhat in front 

 and behind, so as to be in the form of an I ; each side of 

 the narrow black line the area is somewhat infuscated; 

 the pronotum transversely oval, wider than long ; surface 

 only slightly rugose. Legs yellow, tarsi a little darker. 

 Wings pale greenish hyaline with yellowish veins. 



Abdomen yellow, with a median dark dorsal stripe. 

 Cerci yellow. 



Male. Tenth abdominal tergite broadly and deeply 

 cleft ; supra-anal lobe recurved, short, at the tip with a 

 flattened chitinized knob;subanal lobes small, unmodified; 

 ninth sternite somewhat produced and truncate behind. 



Female. Eighth abdominal sternite with a large sub- 

 genital plate, which normally extends over segment nine 

 and part of ten, very broadly emarginate behind. 



Distribution. — Type, female, No. 10048, Aug. 20, 1914, 

 Grant, Colo. (Banks' Coll., Mus. Comp. Zool., Cambridge, 

 Mass.) ; one male, one female, July 20, 1921, Yellowstone 

 National Park; eight females, Tolland, Colo. (G. S. 

 Dodds) . 



