78 THOMAS SAY FOUNDATION 



yellowish brown. M-mark across the frons very obscure, 

 showing by faint translucence in the midst of the brown. 

 Eyes and ocelli both very small and equidistant in spac- 

 ing. 



Prothorax about twice as wide as long and a little nar- 

 rowed posteriorly, with front margin convex and hind 

 margins straight and both lineate with brown except at 

 middle stripe. Bosses very few and coarse and ill defined. 

 Middle yellow line very broad upon the collar, then nar- 

 rowed to a line, then ovately rounded and then ending tri- 

 radiately on the rear of the segment, the middle rav be- 

 ing continued upon the front of the mesothorax. Legs 

 pale brownish ; tarsi darker brown. Wings subhyaline 

 with sharply defined and copious brown venation. The 

 subcostal vein is strong and toward its tip it lies rather 

 nearer to the radius than to the costa. The three apical 

 costal crossveins are long and strongly aslant. The radial 

 sector is 5-branched in both wings with a cord cell at its 

 base next vein M. There are seven or eight crossveins 

 in median and cubital area of fore wing. Fusion of veins 

 Rs and M in the hind wing extends over about one-fifth 

 the middle area, and the second anal vein is two or three 

 branched and strongly sinuate ; the third anal is less sin- 

 uate. 



The abdomen is brown at the sides, paler dorsally and 

 ventrally, and almost wholly yellow on segments 9 and 10. 

 Tails yellow at base (broken off) . 



Male unknown. 



Female. The subgenital plate is both wide and long, 

 broadly rounded, obliquely incised at the base, extending 

 across the 9th sternite, dark colored and clad with soft 

 hairs on its ventral face. 



The venation holds the best distinctive features for 

 this species, which differs from its allies in having the 

 base of the 1st anal vein in the fore wing nearly straight. 

 The 2nd anal of the hind wing strongly sinuous, the sub- 

 costal vein running slightly nearer to vein R than to vein 

 C and the apical costal crossveins very strongly aslant. 



Distribution. — A single female holotype specimen from 

 Sunburst, N. C, May 6, 1912. 



Cornell University Collection. 



Perla alameda, new species. 



(Plate V2, fig. 2; plate IS, fig. 4.) 



Length, male, 13 mm. ; expanse, 24 mm. 



Color smoky brown, varied with paler brown, yellowish 



