March, :9i7-] FoRBES : HydRIOMENIN-^ OF THE UNITED STATES. 51 



10. A translucent band on posterior half of fore wing, folded in repose.... ii 



10. No translucent area on fore wing 12 



11. The band covering most of lower half of wing. . Grossbeckia (11). 



11. A narrow band in submedian space Catoclothis. 



12. Sc and R of hind wing separate, connected by a crossvein (Ri). 



Heterophleps (8). 

 12. Sc and R fused shortly, near end of cell Carsia (13). 



12. Sc and R fused on second fourth of cell at least 13 



13. Front strongly projecting (half the width of the eyes or more), smooth 



scaled Nasiisina (21). 



13. Front less prominent, or triangularly extended at clypeus only, often with 



a conical tuft of hair . 14 



14. Wings translucent, the scales narrow, hairlike, R2 and R5 arising nearly 



opposite each other from the single ace. cell Eudule (16). 



14. Wings more normally scaled, Ro arising far beyond R5 15 



15.- Eyes half as wide as front, vestiture very hairy. 



Psychophora and Trichochlamys (17, 18). 



15. Eyes wider, vestiture usually mostly of scales 16 



16. Mdcv. of hind wing long and sharply bent, the lower half sometimes nearly 



longitudinal ^ 17 



16. Mdcv. short and straight, the lower often oblique 23 



17. Outer margin of hind wing deeply scalloped, of fore wing wavy 18 



17. Outer margin of hind wing at most a little wavy 19 



18. Tooth at tip of Mo hardly half as large as the others Coryphista (24). 



18. Teeth of hind wing practically equal Triphosa {27). 



19. Front rounded out, smoothly scaled, the palpi hardly exceeding it 20 



19. Front rough-scaled and projecting below, much exceeded by the palpi as 



a rule 22 



20. Black and red, simply marked (Enotrus (29). 



20. Marks simple above, often with a yellow ground color, below more complex. 



Stamnodes (30). 



20. Marks complex above on a gray or white ground, simpler below 21 



21. Two accessory cells Epirrita (31). 



21. First ace. cell rudimentary or absent Venusia (32). 



22. Both wings similarly marked with numerous brown and clay-colored wave- 



lines Calocalpe (23). 



22. Markings of other types, usually simpler on hind wings. 



Lygris (26), Monotaxis (28) and Hydriomena (series I) (37). 



23. Front rounded out, smoothly scaled (often contrastingly dark), the palpi 



hardly if at all exceeding it, the clypeus small 24 



23. Front obliquely extended or rough-scaled below, the palpi usually extend- 



ing well beyond it 25 



24. Black, fore wing bluntly rounded, humeral cell of fore wing in our species 



a fourth as long as discal cell Polythrena (25). 



24. Light gray or white ; apex marked, humeral cell smaller, normal. 



Euchoeca (33). 



