226 THOMAS SAY FOUNDATION 



brown, front angles quite broadly rounded, hind angles 

 sharp ; slightly narrowed behind ; median longitudinal 

 field one-fourth the width of pronotum ; disc somewhat 

 rugose. Legs brown. Wings reddish fumose; two Cu 

 crossveins beyond M-Cu crossveins. 



Male. Abdominal tergites unmodified except 10, which 

 is partly cleft, each side being triangularly produced pos- 

 teriorly; supra-anal lobe triangular, bearing at the tip a 

 slender recurved whiplike process ; cerci modified into 

 chitinous armed processes, bulbous at the base and bear- 

 ing at the tip as well as below a sharp tooth ; subanal lobes 

 greatly modified into a probe, each lobe receding into 

 segment nine where the two lobes unite into a long, slen- 

 der, posteriorly produced, upcurved probe bearing at the 

 tip a bulbous membranous enlargement ; titillators absent ; 

 ninth sternite produced into a subgenital plate which is 

 medially deeply and broadly notched; ventral lobe large, 

 hairy, and half again as long as wide. 



Female. Unknown. 



Holotype, male, July 4, 1908, Emerald Lake, Canadian 

 Rockies (J. C. Bradley, in Cornell University Collection). 



Leuctra carolinensis Claassen. 



(Plate 41, figs. 1-3; plate 42, fig. 10; plate 32, fig. 4.) 

 1923. Leuctra carolinensis Claassen, Can. Ent., 55:258. 



Length to tip of wings, male, 8.5 mm. ; female, 9 mm. 

 Expanse, male, 15 mm. ; female, 15.5 mm. 



General color dark brown or blackish. Head blackish, 

 wider than prothorax; hind ocelli about two diameters 

 distant from the eyes. Prothorax dark brown, the rugosi- 

 ties blackish, wider than long, not narrowed behind ; front 

 angles rounded, hind angles sharp; median longitudinal 

 field between one-fourth and one-fifth the width of pro- 

 notum ; disc quite rugose. Legs brown. Wings dark 

 fumose. 



Male. Seventh abdominal tergite bearing a broad, tri- 

 angular, spatulate, raised, chitinous process reaching en- 

 tirely across the seventh tergite ; supra-anal lobe triangu- 

 lar, short, hairy ; cerci unmodified ; subanal lobes quite 

 broad ; titillators about as long as subanal lobes, broad at 

 base but beyond very slender and curved ; ninth sternite 

 slightly produced backward; ventral lobe small, wider 

 than long, hairy. 



Female. Eighth abdominal sternite produced into a 

 bilobed, widely emarginate subgenital plate, reaching at 



