I 



NOTES ON SOME NORTH AMERICAN MOTHS OF THE 

 SUBFAMILY EUCOSMINAE 



By Carl Heinrich 



OJ the Bureau of Entomology, United States Department of Agricidture 



Since the publication of my revision of the Eucosminae (U. S. Nat. 

 Mils. Bull. 123, 1923) a large amount of additional material has been 

 received, including the Fernald collection. These accretions have 

 enabled me to make genitalic studies of tj'^pes, cotypes, or other 

 authentic specimens of species hitherto not available for dissection. 

 They have also disclosed several new species for which names are 

 required. The notes and descriptions in this paper are designed to 

 make this new information available. 



In the present paper 16 species and 3 varieties are described as new. 

 The genitalia of 13 previously described species are figured for the 

 first time, and notes are given on 9 other species. 



I also take this opportunity to correct some errors in m}'- previous 

 papers dealing with this group, and to ofTer an amended key to the 

 genus HystricopJiora. 



THIODIA FORMOSANA SUBCANDIDA, new variety 



hike Jormosana, except that hind wing of male is snow white toward 

 base with a dark, smoky fuscous shading toward apex and along 

 termen. This character holds through a long series from the type 

 locality and seems to indicate a local race. In a large series of typi- 

 cal /ormosana before me the hind wings of both males and females 

 are uniformly dark throughout. The genitalia of suhcandida are also 

 somewhat smaller than those of typical formosana, but of the same 

 type. 



Alar expanse. — 17-21 mm. 



Type.—Csit. No. 41198, U.S.N.M. 



Paratypes. — In National collection, American Museum, Canadian 

 National, Barnes and Bryant collections. 



Type locality. — Bilby, Alberta, Canada. 



Food plant. — Unknown. 



Described from male type, 1 female and 20 male paratypes all from 

 the type locality and bearing various June, 1924, dates (Owen Bryant, 

 collector). In the female the hind wing is dark throughout as in 

 typical jormosana. 



-Proceedings U. S. National Museum, Vol. 75, Art 8 

 -1 1 



