PLECOPTERA OF NORTH AMERICA 195 



ment half again as long as broad; second and third seg- 

 ment each a little wider than long ; fourth and fifth about 

 as long as wide. 



Male. The ninth abdominal sternite hairy, with a small, 

 prominent, longitudinally oval, smooth hammer; subanal 

 lobes modified into cylindrical recurved hooks, bluntly 

 pointed, and with a brush of hairs on the hind basal mar- 

 gin. Tenth abdominal tergite with about twelve short 

 spines on pegs each side of the middle, the other tergites 

 smooth. 



Female. The subgenital plate of the eighth abdominal 

 sternite large, hairy, and produced over almost the entire 

 ninth segment; deeply and squarely excised in the mid- 

 dle so as to leave a large lobe on each side. 



Distribution.— One 9, Raleigh, N. C, May 27 (C. S. 

 Brimley) ; four 2 s, five 9 s, Black Mts., N. C, June 1-Aug. 

 30, 1912 (Beutenmuller) ; West Point, N. Y. (Wm. T. 

 Davis). 



This species is readily recognized by its pale color, in 

 the female by the form of the subgenital plate, and in the 

 male by the longitudinally oval hammer and the cylindri- 

 cal subanal lobes with a brush of hairs at their base. 



Acroneuria georgiana Banks. 



(Plate 15, fig. 4; plate 19, figs. 13-16.) 

 1914. Perla georgiana Banks, Proc. Acad. Nat. Sci. Phil., p. 608. 



Length to wing tips, male, 17 mm. ; female, 19 mm. Ex- 

 panse, male, 30 mm. ; female, 33 mm. 



Color light yellowish brown, abdomen darker and wings 

 very pale. Head yellowish, the clypeus, ocellar triangle 

 and hind angles behind the eye washed with brownish, 

 also the two basal segments of the antennae. Rear ocelli 

 ringed with blackish pigment within, closer to each other 

 than to the eyes. M-mark crossing the frons obscure 

 yellowish. Antennae toward the tips and palpi brownish. 



Prothorax almost as wide as the head, very much nar- 

 rowed rearward, hind margin a little and front margin 

 very convex. Sides nearly straight. There is a wide 

 smooth median area traversed by a rather narrow mid- 

 dorsal yellow stripe. Rugosities on the sides of the disc 

 well marked, rather broad and not numerous. Legs yel- 

 lowish. Wings and veins pale yellowish brown. 



Abdomen olive brown, the segments toward the rear 

 with numerous black spots. Tails yellow, partially cov- 

 ered with hair. 



Male. Ninth abdominal sternite medially produced 

 near the hind margin into a triangular percussion 



