ART. 19. MOTHS OF THE GENUS DIATEAEA — DYAE. AND HEINRICH 9 



12. Lateral arms with subapical spur 13 



Lateral arms without subapical spur 15 



13. Apex of uncus broadened grandiosella Dyar (p. 25) 



Apex of uncus bluntly pointed 14 



14. Gnathos as long as uncus; with a strong inner spur before apex 



muellerella Dyar and Heinrich (p. 25) 

 Gnathos shorter than uncus ; without inner spur 



schausella Dyar and Heinrich (p. 24) 



15. Harpe with a smooth digitate, subbasal projection from costa 16 



Harpe without subbasal projection from costa 17 



16. Costal projection of harpe over three times as long as broad. 



I canella Hampson (p. 20) 

 [ anathericola Dyar and Heinrich (p. 21) 

 Costal projection of harpe less than twice as long as broad. 



amnemonella Dyar (p. 21) 



17. Gnathos decidedly broadened toward apex fuscella Schaus (p. 22) 



Gnathos terminating in a strong, up-curved hook 18 



Gnathos beak-like (slender and tapering to extremity) 19 



18. Uncus with lateral flaps and dilated at apex zeacolella Dyar (p. 19) 



Uncus without lateral flaps and bluntly pointed at apex. 



postlineella Schaus (p. 20) 



19. Harpe with a slight triangular projection from base of costa. 



maronialis Schaus (p. 23) 

 Harpe without triangular projection from base of costa 20 



20. Gnathos with little or no spining near apex gaga Dyar (p. 18) 



Gnathos with appreciable spining near apex venosalis (Dyar) (p. 22) 



1. Genital opening with a chitinous shield projecting from its lower 



margin, or a strong chitinization in the depressed area immediately 



behind it, or with genital opening itself greatly widened 2 



Genital opening otherwise; sometimes with a thin broken ring about 

 mouth, or with lateral edges of mouth very slightly raised and chiti- 

 nized, but normally simple ; genital opening of normal size 12 



2. Genital opening greatly widened guatemalella Schaus (p. 14) 



Genital oi)ening of normal size 3 



3. Bursa copulatrix with half of one side toward ductus strongly chitinized 



and with an internal median girdle of serrate ridges. 



strigipennella Dyar (p. 27) 

 Bursa copulatrix normal (with strong chitinizations absent or in neck 

 only) 4 



4. Area immediately back of genital opening unpigmented and weakly 



chitinized 5 



Area immediately back of genital opening darkly pigmented and 

 strongly chitinized 9 



5. On each side of genital opening, a saucer-like chitinized depression the 



posterior edge of which is raised into a roughened ridge. 



saccharalis (Fabricius) (p. 11) 

 pallidostricta Dyar (p. 16) 

 tabernella Dyar (p. 15) 

 incomparella Dyar and Heinrich (p. 13) 

 angustella Dyar (p. 17) 

 Area on each side of genital opening flattened or, if slightly depressed, 



without the raised posterior ridge 6 



48189—27 2 



