520 TORTRICINA [ACALLA 



the most variable known Lepidoptera), that they are difficult to 

 understand without considerable experience; and the specific 

 distinctness of certain forms is still not satisfactorily ascer- 

 tained. Hence a tabulation of the species is more than usually 

 troublesome to make, and more than usual caution will be 

 required in its application. 



1. Apex of forewings appearing subfalcate 19. contamitiana. 



,, not appearing subfalcate . 2. 



2. Forewings green . . . .6. literana. 



not green . . . .3. 



3. Forewings with triangular white costal spot 24. holmiana. 



without such spot . . .4. 



4. Head dark, thorax pale . . . .5. 

 Head and thorax concolorous . . .6. 



5. Hindwings whitish -fuscous, forewings reddish- 



ochreous . . .14. permutana. 



g rev > forewings ochreous to blackish 



13. variegana. 



6. Forewings with extremely large central tuft 1. cristana. 



with central tuft not extremely large . 7. 



7. Costa of forewings distinctly roughened with scales 8. 



,, not roughened with scales . 13. 



8. Termen of forewings sinuate . . .9. 



not sinuate . . .12. 



9. Termen of forewings moderately oblique . 10. 



little oblique . 12. logiana. 



10. Costa of forewings faintly concave . 2. hastiana. 



not concave . . .11. 



11. Forewings with large submedian tuft . 3. umbrana. 



with tufts all slight . . 5. sponsana. 



12. Species larger, grey-whitish . . 7. niveana. 



smaller, grey or white . . 8. boscana. 



13. Forewings with one or more tufts well-marked . 14. 



with tufts all slight or absent . . 17. 



14. Hindwings grey-whitish . . 20. shepherdana. 



grey . 



15. Costa of forewings faintly concave ; species larger 16. 



faintly convex; species smaller 



17. comariana. 



16. Forewings pale reddish-brown to dark fuscous 



15. perplexana. 

 ochreous-grey to ochreous-brown 



16 schalleriana. 



