TORTRIOINA [kucosma 



observed that in dark specimens of pro/undana, lacunana, and 

 Irt-anderiana the markings are sometimes obsolete. 



1. Forewings with apical third conspicuously paler . 2. 



,, „ apical third not conspicuously paler 13. 



2. Antemedian space mostly whitish . 5. corticana. 



„ ,, not mostly whitish . . 3. 



3. Forewings with extreme apex blackish-marked . 4. 



„ „ „ not blackish-marked 8. 



4. Posterior edge of central fascia with abrupt median 



indentation 16. sauciana. 

 „ „ „ without conspicuous 



indentation . 5. 



5. Posterior edge of central fascia with angular median 



prominence 11. pnmiana. 

 „ „ „ without marked pro- 



minence . . 6. 



6. Forewings with distinct transverse tornal mark . 7. 



„ without such mark . .12. oblongana. 



7. Tornal mark pale grey . . 13. f/mtiamzwa. 



„ ,, pale ochreous . .14. sdlwna. 



8. Two or more black dots in disc beyond central fascia 9. 

 At most one dark spot beyond central fascia . 1 2. 



9. Central fascia posteriorly with triangular projection 



surmounted by two dots . 9. vwriegwna. 

 ,, „ without such character . .10. 



10. Central fascia posteriorly subconvox 10. ochroleucana. 



„ „ „ subconcavo . .11. 



11. Central fascia posteriorly with abrupt median in- 



dentation . 7. capreana. 

 „ „ „ without such indentation 



8. sororculana. 



12. Central fascia followed by dark median spot 



15. dimidiana. 

 „ „ not followed by dark spot 6. betulctana. 



13. Base and dorsum conspicuously paler . 1. salicella. 



„ „ not markedly paler . . 14. 



14. Forewings with black metallic-dotted submedian 



patch . . .22. arcuella. 



„ without such patch . . . 15. 



15. Basal patch not traceable, forewings reticulated . 10. 



„ ,, more or less indicated . .19. 



16. Head and thorax pinkish-ochreous . .17. 



„ ,, fuscous . . . .18. 



