PLECOPTERA OF NORTH AMERICA 225 



The second specimen is badly shrivelled but the eighth 

 abdominal sternite apparently is but slightly produced 

 and broadly emarginate in the middle. 



Type No. 11368, Aug. 10, 1902, Port Renfrew, B. C. 

 (Banks Collection, Museum of Comparative Zoology, Cam- 

 bridge, Mass.). 



Leuctra biloba Claassen. 



(Plate 40, figs. 9, 10; plate 42, fig. 6.) 

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



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

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



General color blackish brown ; head wider than pro- 

 thorax, blackish, closely covered with fine pile ; hind ocelli 

 between two and three diameters distant from eyes. Pro- 

 thorax dark brown, a little narrowed behind (in female 

 not narrowed behind), wider than long; front angles 

 broadly rounded, hind angles rather sharp ; median longi- 

 tudinal field at least one-fifth the width of pronotum ; disc 

 only slightly rugose. Legs brown. Wings dusky f umose ; 

 2-4 Cu crossveins beyond M-Cu crossveins. 



Male. From the anterior margin of the eighth tergite 

 there projects backward a raised bilobed chitinous proc- 

 ess, the lobes of which are truncate ; from the tenth ter- 

 gite projecting forward a bilobed chitinous process whose 

 lobes are evenly rounded ; supra-anal lobe broadly 

 rounded; cerci unmodified; subanal lobes broadly elon- 

 gate ; titillators slender, a little shorter than subanal 

 lobes ; ninth sternite somewhat produced, not heavily 

 chitinized; ventral lobe half again as long as wide, bear- 

 ing long hairs. 



Female. Eighth abdominal sternite produced into a 

 bilobed subgenital plate with a shallow triangular median 

 notch. 



Holotype, male, allotype, female, May 20-25, 1911, 

 Black Rock Mt., Rabun Co., Ga. (CornellUniversity) ; one 

 male, same locality as type. 



Leuctra bradleyi Claassen. 



(Plate 41, figs. 12-15; plate 32, fig. 1.) 

 1923. Leuctra bradleyi Claassen, Can. Ent., 55:257. 



Length to tip of wings, male, 6 mm. Expanse, male, 

 10.5 mm. 



General color brown. Head brown, wider than pro- 

 thorax, feebly pilose ; hind ocelli about two diameters 

 distant from eyes. Prothorax hardly wider than long, 



