184 THOMAS SAY FOUNDATION 



Wings subhyaline; veins brown, except veins C, Sc, R, 

 and the costal crossveins which are yellowish. Venation 

 as in figure. 



Abdomen pale yellow above and below, sides brownish. 

 Tails pale, somewhat darker towards the base; rather 

 thickly covered with hairs. 



Male, unknown. 



Female. The ventral plate of segment 8 produced over 

 about half of segment 9 ; a strong declivity in the middle, 

 so that the apparent hind margin is evenly rounded and 

 bears in the middle a somewhat triangular process, the 

 margin of which is slightly excavated (pi. 28, fig. 24) . 



Distribution. — One female from Lake George, Juanita 

 Island, N. Y., summer, 1920. The type locality is Georgia. 



Acroneuria internata Walker. 



(Plate 16, fig. 6; plate 28, figs. 5, 6; plate 30, fig. 5.) 

 1852. Acroneuria internata Walker, Cat. Neurop. Brit. Mus., p. 152. 

 1922. Acroneuria internata Needham and Claassen, Can. Ent., 54:252. 



Length to tip of wings, male, 28 mm. ; female, 30-35 

 mm. Expanse, male, 40 mm.; female, 52-60 mm. 



Color yellowish brown. Head with a brownish spot cov- 

 ering the ccellar triangle, rounded behind and notched 

 in front and sending a branch each way toward the eyes. 

 A triangular brownish spot above the mouth and a brown- 

 ish line before the base of each antenna. Elsewhere yel- 

 lowish except for a touch of brown on the hind angles ex- 

 ternally. Ocelli large, the posterior ones nearer to each 

 other than to the eyes, and ringed internally with blackish 

 pigment. Antennae yellowish beyond the brown basal 

 joint, darker toward the tip ; palpi yellowish. 



Prothorax narrower than the head, somewhat nar- 

 rowed rearward, a little wider than long with a narrow 

 and obscure yellow middorsal line. Disc yellowish brown 

 with moderately strong rugosities. Legs yellowish. Fe- 

 mora with a dark ring just before the tip. Wings uni- 

 formly subhyaline. Veins brown. 



Abdomen yellowish brown, irregularly clouded with 

 darker color. Tails brown, somewhat lighter on the basal 

 segments, thickly covered with rather long hairs. 



Male. The hammer on the prolonged 9th ventral ster- 

 nite is transverse, oval, and smoothly polished. The geni- 

 tal hooks are long and slender and cylindrical, and sharply 

 pointed. 



Female. Subgenital plate covers the basal third or 

 more of the 9th sternite, is oval in outline, and bears at 



