10 BULLETIN 132, UNITED STATES NATIONAL MUSEUM 



A genus about equally represented in North and South America 

 and Europe. The costal fold appears to be an acquired character — 

 not primative for the group. In North America it separates the 

 species into two groups differing decidedly in the shape of the 

 harpe of the male genitalia; those with the fold have the cucuUus 

 bent back on costa in the form of a broad hook, and these without 

 the fold have it crescentiform or sem^itrigonate. This difference 

 however does not hold for the European species (most of these with 

 the fold having the cucullus crescentiform). Busck, ignoring the 

 fold, suggests in his revision of the genus '^ a possible division upon 

 the degree of obliqueness of the termen, the relative positions of 

 veins 9 and 10 and the relative width of areas above and below 

 the median vein of forewing, the protrusion of apex of hind wing 

 relative to tornus of forewing, and the color of the palpi. These 

 characters do not hold with any consistency, and, as far as they do, 

 separate into two groups forms with almost identical genitalia (like 

 hana and capitana), and group together others with radically dif- 

 ferent genitalia (like kana and hatiana). It is impossible to hold 

 Lipoptycha as a separate genus upon any character or set of 

 characters. The division I make here into two groups upon the 

 costal fold is apparently a natural one as far as our American species 

 are concerned, but no farther. 



So far as known the larvae are root and shoot borers in Com- 

 positae. 



KEY TO THE SPECIES OF DICHRORAMPHA 



1. Thorax and fore wiug striped in orange yellow and blackish fuscous. 



(12) leopardana 

 Thorax and fore wing otherwise 2. 



2. Fore wing with three or more black dots on termen near tornus 3. 



Fore wing without such 9. 



3. Outer half of fore wing heavily dusted with golden yellow (5) bittana. 



Outer half of fore wing with faint yellow dusting or none 4. 



4. Termen of fore wing decidedly slanting, angle with costa less than 60° — 5. 

 Termen of fore wing less slanting, angle with costa over 60° 6. 



5. Fore wing with strong white dorsal spot (2) capitana. 



Fore wing with very faint whitish dorsal spot or none (1) kana. 



6. Fore wing with no trace of pale dorsal spot ; no costal fold in male. 



(10) sedatana. 



(11) dana. 

 Fore wing with pale dorsal spot at least indicated, normally strongly marked ; 



male with costal fold 7. 



7. Alar expanse 10 mm. and less ; dorsal spot of fore wing white, divided by a 



strong dark line (6) incanana. 



Alar expanse 11 mm. and over ; dorsal spot normally yellow, if white 

 unmarked or very faintly lined S. 



Troc. Biol. Soc. Washington, vol. 19, 1906, pp. 173-176. 



