PLECOPTEBA OF NORTH AMEEICA 227 



least half way across the ninth sternite ; the lobes of the 

 plate bear long hairs. 



Holotype, male, allotype, female, June, 1922, Black Mts., 

 N. C. (Beutenmiiller, in Cornell University Collection) ; 

 other males and females from same locality as the type ; 

 one male and one female, May 21, 1911, Barton, Ga. (J. C. 

 Bradley). 



Leuctra decepta Claassen. 



(Plate 40, figs. 5, 6; plate 42, fig. 4.) 

 1923. Leuctra decepta Claassen, Can. Ent., 55:260. 



Length to tip of wings, male, 7 mm. ; female, 8.5 mm. 

 Expanse, male, 11 mm. ; female, 14 mm. 



General color brown to blackish. Head wider than pro- 

 thorax, blackish ; occiput finely granulate ; hind ocelli be- 

 tween three and four diameters distant from eyes. Pro- 

 thorax brown, wider than long; front angles broadly 

 rounded, hind angles rather sharp; median longitudinal 

 field a little less than one-fourth the width of pronotum ; 

 lateral pronotal disc quite rugose. Legs brown, wings 

 dusky. 



Male. Eighth abdominal tergite with a narrow ante- 

 rior chitinized collar medially produced into a short 

 rounded knob which is not raised or very slightly so ; ante- 

 rior margin of seventh tergite sometimes with a sugges- 

 tion of a smaller but similar chitinized area as eighth ; su- 

 pra-anal lobe broadly rounded ; cerci unmodified ; subanal 

 lobes quite slender and considerably longer than the titil- 

 lators ; ventral lobe a little longer than wide. 



Female. Eighth abdominal sternite produced into a 

 broadly and deeply notched bilobed subgenital plate, bear- 

 ing long hairs and reaching nearly half way across the 

 ninth sternite. 



There seems to be considerable variation in the extent 

 to which the chitinizations on the abdominal tergites of 

 the males have developed in this species. 



Holotype, male, allotype, female, June 29, 1922, Ring- 

 wood Hollow, Ithaca, N. Y. (Cornell University Collec- 

 tion) ; two males, five females, same locality as types ; one 

 male June 7, 1905, Old Forge, N. Y. 



* Leuctra duplicata Claassen. 



(Plate 41, figs. 4, 5; plate 42, fig. 9.) 

 1923. Leuctra duplicata Claassen, Can. Ent., 55:260. 



Length to tip of wings, male, 7 mm. ; female, 8-8.5 mm. 

 Expanse, male, 12 mm. ; female, 14.5 mm. 



General color blackish brown. Head wider than pro- 

 thorax, blackish, covered with pile ; occiput somewhat ru- 



