310 AMERICAN PSYCHODID^. 



PSYCHODA. 



1. Wiugs black 2. 



Wings mottled with white and black 11. 



Wings gray or smoky gray 12. 



2. Wings with iridescent scales, hind tarsi only partly white nitida. 



Wings without iridescent scales 3. 



3. Hind tarsi wholly pale yellowish or whitish 4. 



Hind tarsi black or only partly pale 8. 



4. Two black patches on wings before middle 5. 



No black patches 7. 



5. Wings with no white patches at tip of veins marginalis. 



Wings with white at tip of veins 6. 



6. Wings over 3 mm., with small white, black and yellow patches of erect flat 



hairs at radial bifurcation and similar patches of black and white at 



cubital bifurcations snowii. 



Wings less than 3 mm., without these patches of flat hair as above. 



albi|>iiii<*tata. 



7. Length of wing more than 2 mm., white at tip albitarsiis. 



Less than 2 mm., without white patches liorizoiitala. 



8. Hind tarsi wholly black, wings and fringe all black 9. 



Hind tarsi with some wliite marks, wings and frings marked with pale-. .10. 



9. Thorax white bicolor. 



Thorax black nigra. 



10. Fringe on posterior margin blackish, abdomen with white hair, wings banded 



with pale, legs pale slossoiii. 



Fringe on posterior margin more whitish, apical margin with distinct black 

 dots, wings not plainly banded though with scattered white hair, legs 

 black superba. 



11. Wings with alternate patches of black and white, antennse shorter than 



breadth of wing, 15-jointed, distinct patches at tip of veins. 



schizura. 

 Wings principally light grayish, with scattered patches of black, antennse 

 13-jointed, equal breadth of wing, patches at apex of wing less dis- 

 tinct florid ica. 



12. Wings uniform gray • 13. 



Wings very dark gray to smoky 16. 



Wings marked with black 17. 



13. Wings at least 2 mm. long 14. 



Smaller; wings less than 2 mm 15. 



14. Antennse slender, slightly longer than width of wing, 15-jointed. .cinerea. 

 Length of antennse one and one-half times the width of wing; 16-jointed. 



elegans. 



15. Fringe on hind margin rather short minuta. 



Fringe on hind margin very long, one-half breadth of wing. 



longifringa. 



16. Wings uniform smoky, without black patches at tip of veins. 



uiiiforinata. 

 Wings lighter, with black patches at apex of most of the veins. 



uocturnale. 



