168 THOMAS SAY FOUNDATION 



behind ; front angles almost sharp ; hind angles broadly 

 rounded ; surface moderately rugose. Legs yellowish, 

 with a dark basal knee-cap on the outside of the tibiae, 

 tips of tarsi darker. Wings yellowish to smoky hyaline; 

 veins brown ; subcosta ends a considerable distance before 

 the cord ; 13-16 costal crossveins before the end of sub- 

 costa and 7-10 beyond; radial sector with three to four 

 branches. 



Abdomen yellowish. Cerci yellow; the basal segment 

 about as long as the following four segments. 



Male. Ninth abdominal sternite produced and rounded 

 behind, at the median basal area with a rounded knob 

 which is about as wide as long; from the base of the knob 

 two divergent ridges, the area between these ridges us- 

 ually sunken ; tenth tergite partly cleft ; supra-anal proc- 

 ess consists of a bulbose membranous lobe whose sides 

 are slightly chitinized ; subanal lobes triangular, upturned 

 and quite sharply pointed. 



Female. The hind margin of the eighth abdominal 

 sternite produced into a broad evenly rounded subgenital 

 plate which usually reaches at least halfway across the 

 following segment. 



Distribution. — Type, female, May 4, 1906, Cornelia, Ga. 

 (Cornell University Collection) ; one male, May 31, Rama- 

 po, N. Y. (Wm. T. Davis) ; males and females, May-June, 

 Black Mts., N. C. (Wm. Beutenmiiller) ; one female, May 

 24, 1911, Black Rock Mountain, Ga. (J. C. Bradley). 



Peltoperla anna Needham and Smith. 



(Plate 31, fig. 8; plate 15, fig. 5.) 

 1916. Peltoperla anna Needham and Smith, Can. Ent.. 48:83. 



Length to tip of wings, male, 16 mm. ; female, 20 mm. 

 Expanse, male, 31 mm. ; female, 37 mm. 



General color yellowish. 



Head yellow, black between the ocelli ; narrower than 

 prothorax ; ocelli closer to eyes than to each other ; an- 

 tennae yellow, darker towards the tip. 



Prothorax yellowish brown, the median portion of each 

 side of the disc a little darker ; about half again as wide as 

 long; front margin nearly straight; hind margin broadly 

 rounded ; front angles narrowly, hind angles very broad- 

 ly rounded ; surface moderately rugose. Legs yellow, with 

 a knee-cap of brownish on the base of the tibia externally 

 and the tips of the tarsi brownish. Wings yellowish hy- 

 aline with brownish veins ; subcosta ends much before the 

 cord; 10-14 costal crossveins before the end of subcosta 



