48 Journal New York Entomological Society, f^'o'- xxv. 



2. Hind wings extremely reduced, with rudimentary cell ; green. Dyspteris (6). 



2. Not green 3 



3. A defined lobe at base of inner margin of hind wing, Sc and R closely 



parallel Trichopteryx (7). 



3. Hind wing crumpled on inner margin, Sc and R well separated. 



Heterophleps (8). 



4. Fore tibia with terminal claw 5 



4. Fore tibia unarmed ; 6 



5. Hind wing without anal vein, with specialized pocket opening upward, at 



base of inner margin Eucestia (9). 



5. Hind wing normal Marmopteryx (10). 



6. Fore wing with a folded translucent portion toward, but not including, 



inner margin 7 



6. Fore wing evenly scaled, rarely folded in repose, M^ of hind wing de- 



veloped 8 



7. Mj of hind wing absent, translucent portion of fore wing about a third 



width of wing Grossbeckia (n). 



7. M2 present, translucent fold much narrower Catoclothis. 



8. Hind wing with a membranous lobe at base of inner margin, supported by 



the rudimentary anals Lobophora (12). 



8. Hind wing with a small specialized pocket at base of inner margin, pre- 

 ceded by a translucent area ; Sc and R shortly fused toward end of cell, 

 anals rudimentary Carsia (13). 



8. Hind wing with one anal at least fully developed, the inner margin less 



modified ; Sc and R fused on second quarter of cell 9 



9. Fore wing with middle discocellular long and bent, causing Mj to appear 



to belong to the cubital system in both wings, frenulum rudimentary, 



multiple .^ Operophtera (14). 



9. Fore wing with mdcv. less than twice as long as Idcv. ; straight except in 



a few Hydriomenas, frenulum developed 10 



10. Rj and Mj stalked together in fore wing, separate from the single small 

 accessory cell Zenophleps (15). 



10. Mj free or arising from the accessory cell (usually stalked in hind wing) . . 11 



11. Fore wing with R^ and R5 arising practically opposite each other at tip of 



accessory cell, wings with sparse hair-scaling, especially on under side. 



Eudule (16). 



11. Wings normally scaled or nearly so; when thinnest with R2 arising far 



beyond R, 12 



12. Head and under side of thorax with rough hairy vestiture, especially on 



palpi ; eyes about half as wide as front 13 (17). 



12, Head smoother, the palpi with largely scaly vestiture, eyes more than two 



thirds as wide as front 14 



13. Antennae bipectinate Psychophora (18). 



13. Antennas simple Trichochlamys. 



14. Hind tibiae with end-spurs only 15 



