24 AMERICAN LEPIDOPTERA. 



case, as this branch (vein 7) goes to the costa, though close 

 before the apex. Veins 3, 4 and 5 of hindwings vary greatly 

 in their origin, not only in different species, but in different 

 individuals of the same species and even in the same indi- 

 vidual. 



In the following table I have endeavored to proceed from 

 the broad winged and dark colored forms to those with nar- 

 row wings and of light color, but from the nature of things 

 this could not always be carried out. Holcocera arizonella 

 Krft. belongs to Colinita Busck. {Scythris Hbn.). 



TABLE OF SPECIES. 



1. Antennae of male excised above basal joint 2. 



Antennae of male not excised above basal joint 21. 



2. Antennal cilia of male 1, or over; excision very deep 3. 



Antennal cilia of male scarcely exceeding one-half ; excision less 



deep 7. 



3. Markings of forewings not in longitudinal streaks 4. 



Markings of forewings in longitudinal" streaks 6. 



4. Ground color white 3. estriatella. 



Ground color not white 5. 



5. Forewings dark purple-brown 1. (lives. 



Forewings tawny, fuscous-gray 2. aphidiella. 



6. Larger, with longitudinal striae in apical part of wing. 



4. gigantella. 

 Smaller, without such striae 5. nigristriata. 



7. Ground color gray or fuscous 8. 



Ground color not gray or fuscous 13. 



8. Unicolorous 6. purpuricomella. 



Not unicolorous 9. 



9. Head, thorax, and base of forewings yellowish. 



7. ochrocephala. 

 No such characters 10. 



10. A v-line within the dorsal margin, antennae very robust. 



8. crassicornella. 

 No such line, antennae at most moderate 11. 



11. Basal third of forewing paler, limited externally by an angu- 



lated line 9. modestella. 



Basal third of forewing not paler 12. 



12. Dark fuscous-brown, wings wider 10. var. fumerella. 



Grayish-fuscous, wings more elongate 10. var. quisquiliella. 



13. Ground color of forewings ochreous 14. 



Ground color of forewings white 15. 



