88 BULLETIN 132, UNITED STATES NATIONAL MUSEUM 



equidistant and well separated; male without chitinous ridge at 

 inner margin. 



Hind tibia of male with short hair pencile from base. 



Male genitalia with harpe moderately long; outer surface un- 

 spined; cucullus well spined throughout, apex evenly rounded; sac- 

 culus normally with a strong tuft of hairlike spines from base; 

 spine clusters Spc^ and Spc^ strongly developed, produced from 

 neck {Spc^ rarely absent). Uncus reduced, weakly chitinized, finely 

 spined beneath. Socii absent. Gnathos simple. Aedoeagus long, 

 slender, slightly curved; cornuti absent. 



Female genitalia without signum. Ductus bursae moderately 

 long, simple. 



Abdomen (of male) with a narrow elongate pocket of papilliform 

 hairs on each side of basal segment (fig. 15). 



The above description is drawn for the American species, which 

 differ rather markedly from the type {hotrana) in both fore-wing 

 venation and genitalia and probably should have separate generic 

 rank. The European species have similar genitalia to l)otrana\ but 

 nothing has quite the same fore-wing venation (10 approximate to 

 9). Neither do they agree any better with the type of Lahesia 

 (permixtana Hiibner) ; artemesiana Zeller and kreithneriana Hornig 

 have similar fore-wing venation (10 and 11 approximate), but lack 

 the peculiar trigonate hind wing of perimxtana. Eventually we 

 shall probably have to restrict the two genera {Polychrosis and 

 Lobesia) to their respective types and find new designations for the 

 species now referred to them. For the present or until such time as 

 the exotic forms can be carefully studied and generic limits exactly 

 defined, I think it better to keep our American species under Poly- 

 chrosis. 



Meyrick in his Australian Revision ^° gives, as one of the charac- 

 ters of Polychrosis^ 6 and 7 of hind-wing connate or stalked. I do 

 not know how this applies to eastern species. It does not for the 

 European or American. In the type and most of the other species 

 6 and 7 are clearly tortriciform (approximate toward base). Rarely 

 (in specimens, and possibly holding for individual species) they 

 anastomose slightly beyond the cell. 



KEY TO THE SPECIES OF POLYCHROSIS 



1. Basal two-thirds of fore wing ashy gray ; without dark median band. 



(14) cyclopiana. 

 Basal two-thirds of fore wing not ashy gray ; dark median band present- 2. 



2. Basal patch and antemedian band of fore wing concolorous and coal- 



esced 3. 



Basal patch and antemedian band not concolorous ; both defined to the 

 naked eye 7. 



loProc. Liim. Soc. N. S. W., vol. 36, 1911, p. 2o6. 



