520 TORTRICINA [acalla 



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

 understand without considerable experience ; and the specific 

 distinctness of certain foi'ms 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. 



L Apex of forewings appearing subfalcate 19. contaminana. 

 ,, ,, not appearing subfalcate . 2. 



2. Forewings green . . . .6. Utermia. 



„ not green . . . .3. 



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



„ without such spot . . .4. 



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

 Head and thoi'ax concolorous . . .6. 



5. Hindwings whitish-fuscous, forewings reddish - 



ochreous . . .14. permxdana. 



„ gi'ey, 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 Avith 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 witli large submcdian tuft . 3. umbrana. 



„ with tufts all slight . . 5. sponsana. 



12. Sjiecies 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. sliqyherdana. 



„ grey . . . _. .15. 



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



„ „ faintly convex; species smaller 



17. cnmariana. 



16. Forewings pale reddish-brown to dark fuscous 



15. perph'j'diin. 

 „ ochreous-grey to ochreous-brown 



16 schalleriana. 



