NOBTH AMERICAN" EUCOSMINAE. 173 



Characters as in Gretchena except : 



Fore wing smooth; termen with a notch between veins 3 and 5. 



Male genitalia with cucuUus of harpe not reduced; lower outer 

 margin of sacculus and lower inner margin of cucullus at incurva- 

 tion of neck densely clothed with slender, short, black spines; no 

 other strong lower marginal spines on cucullus; anal spine of cu- 

 cullus weak. Socii broadly triangular; articulating with tegumen 

 on a stem. Aedoeagus rather slender; articulation between annellus 

 and aedoeagus moderate. 



A compact little genus closely related to Gretchena and apparently 

 derived from the Ejnnotm stem. The genitalia of the different 

 species are so much alike that it is extremely difficult to use these or- 

 gans for specific differentiation. 



KEY TO THE SPECIES OP EXEXTBRA. 



1. Fore wing whitish ochreous witli a large red-brown blotch on costa 2 



Fore wing not so marked 3 



2. Head cream white; pale area of fore wing witli a very few scattered darlc 



dots (8) costomaculana. 



Head sordid ochreous; pale area of fore wing finely lined and dusted with 

 fuscous-ochreous (9) virginiana. 



3. Fore wing with a distinct wavy, contrasted blaeli line from apex to middle of 



upper margin of cell 4 



Fore wing without such 5 



4. Fore wing with a broad clay colored shading over lower part of cell and a 



distinct line of black scaling along vein 2, ending in a black dot before 



ocellus (5) faracana. 



Fore wing without such ; or with black line over vein 2, diffused with other 

 blackish scaling (4) haracana. 



5. Fore wing with a complete, sharply contrasted dark basal patch and a com- 



plete, sharply defined post median fascia ; pale areas sharply defined 



(6) maracana. 



Fore wing with basal patch obsolete, poorly defined or more or less suffused 



with paler shadings ; post median fascia absent or broken below middle, if 



complete not sharply defined and contrasted; pale areas more or less 



suffused with darker scaling 6 



6. Dark shading over ocelloid patch on fore wing semilustrous and somewhat 



bronzy (7) habrosana 



No definable dark shading over ocelloid patch or if present ochreous or 

 fuscous, or ferruginous ochreous, not semilustrous or bronzy 7 



7. Median dorsal area of fore wing sordid whitish or whitish ochreous ; ground 



color not slate gray (3) spoliana. 



Median dorsal area or fore wing pale slate gray; ground color pale slate 

 gray 8 



8. Fore wing not unicolorous ; a blackish fuscous spot on dorsum before ocellus 



and an indication of dark basal patch at least on dorsal margin near base. 



(1) improbana. 

 Wing unicolorous or with darker markings almost obsolete. 



(2) var. oregonana. 

 7806—23 12 



