230 THOMAS SAY FOUNDATION 



the middle of the seventh tergite ; supra-anal lobe rounded 

 behind; cerci unmodified; subanal lobes quite broad; titil- 

 lators about as long as subanal lobes, at the tip sharply 

 recurved ; ventral lobe about as wide as long. 



Female. Eighth abdominal sternite produced into a 

 bilobed, widely notched, subgenital plate which reaches 

 half across the ninth sternite ; the lobes are truncate and 

 bear long hairs ; median field of seventh and eighth ster- 

 nite blackish. 



Holotype, male, allotype, female, July, 1905, Old Forge, 

 N. Y. (Cornell University) ; five males, two females, June 

 24, 1905, Old Forge, N. Y. ; one male, one female, June 23, 

 1910, Woolworth Lake, Fulton Co., N. Y. ; one male Sacan- 

 daga Park, N. Y. (E. P. Felt) ; one male, one female, Aug. 

 16, Mt. Marcy, Eeene Valley, N. Y. ; one male, six females, 

 Aug. 1912, Mt. Katahdin, Me. 



Leuctra infuscata Claassen. 



(Plate 43, figs. 3-5.) 

 1923. Leuctra infuscata Claassen, Can. Ent., 55:262. 



Length to tip of wings, male, 7 mm.; female, 9 mm. 

 Expanse, male, 11 mm.; female, 15 mm. 



General color dark brown. Head wider than prothorax, 

 nearly smooth ; hind ocelli about twice as close to eyes 

 as to each other. Prothorax dark brown, narrowed be- 

 hind, wider than long, median longitudinal field between 

 one-third and one-fourth as wide as whole pronotum ; 

 disc of pronotum somewhat rugose, the rugosities black- 

 ish. Legs dark brown. Wings inf uscated ; Sc2 bends 

 down to R, not at a sharp angle, but more or less with a 

 gradual curve ; 2-3 Cu crossveins beyond M-Cu crossveins. 



Male. Tergites of abdominal segments unmodified ; su- 

 pra-anal lobe produced into a short bulbous process which 

 is excavated above and on the lateral upper margins with 

 a narrow chitinous band closely beset with long hairs; 

 cerci membranous, very large, about four times as long 

 as wide ; subanal lobes produced into long swordlike proc- 

 esses, abruptly drawn to a slender rod before the tip and 

 bearing below near the tij. a recurved spine ; titillators 

 curved down and then up again, slender, heavily chiti- 

 nized ; ventral lobe very short, hairy, much wider than 

 long. 



Female. Eighth abdominal sternite produced into a 

 subgenital plate, which is medially somewhat raised into 

 a hairy ridge, notched in middle, the notch produced by a 

 triangular heavily chitinized plate on each side. 



