OF WASHINGTON. 127 



with basal joints of antennae very long Lepidostoma. 



9. Anal vein apparently running straight into branch of cubitus, really 



connected to cubitus by a cross-vein sloping backward 10 



Anal vein running into margin, or in female connected to branch 

 of cubitus by a cross-vein; male with costal margin broadly re 

 curved over wing Olemira. 



10. In fore wing a longitudinal vein between anal and cubitus for some 



distance; four apical cells in hind wings; cubitus of fore wings 

 with one fork; male maxillary palpi heavily hirsute, porrect. 



Atomyia. 



In fore wing no such vein between anal and cubitus; three apical 

 cells (or really two) in hind wings; cubitus of fore wings with 

 two forks; maxillary palpi of male small, slender, upcurved and 

 appressed Mormomyia, n. gen. (Mormonia vernalis Banks). 



11. Spurs 2-2-2; forks 2 and 3 present in fore wings Oligoplectrum. 



Spurs 2-3-3; forks 2 and 3 present in fore wings; antennae rather 



widely separated Brachycentrus. 



Spurs 2-2-4; forks 2 and 3 absent in fore wings Helicdpsyche. 



Spurs 2-4-4 > area interclavialis enlarged at tip Goer a. 



Triaenodes frontalis, n. sp. (PL IX, fig. n). 



Head black, clothed with snow-white hair, a large tuft under each 

 antenna with some black hairs in it; palpi brown, with white hair; 

 antennae with snow-white hair, and brown annulations at ends of joints; 

 thorax black, with snow-white hair ; abdomen yellowish ; legs yellowish, 

 with yellowish hair. Fore wings mostly clothed with white and gray 

 hair, some black hair, especially on apical part; a black mark on radius 

 near stigma, one on median near cell, and one at arculus, with black 

 fringe at this point; apical part more or less irrorate with brown or 

 black; hind wings smoky, blackish on tips, fringe gray. 



Expanse, 16 mm. 



One from Ft. Collins, Colo., 20 June (Baker). 

 Readily separated from T. grisea by black head and snow- 

 white hair. 



Setodes vernalis, n. sp. (PL VIII, fig. 3). 



Pale yellowish ; abdomen dull brown, except paler appendages ; wings 

 rather dusky, with the radius and cubitus dark brown; hairs on costal 

 region golden, in apical part mostly blackish; forks I and 3 of equal 

 length, the first with a pedicel rather longer than the veinlet closing 

 the discal cell; lower branch of radial sector ending at tip of wing. 

 Hind wings rather dusky, scarcely darker on tips, fringe long, and 

 dark gray. Appendages of male as figured; a long, slender, curved 

 piece each side, which, seen from above or below, meets its fellow to 

 form a circle, their inner edges with long fine hairs. 



Expanse, n mm. 



