NORTH AMERICAlSr EUCOSMINAE. 57 



39. THIODIA ARGENTICOSTANA ( Walsingham) . 



(Fig. 110.) 



Semasia argenticostana Walsingham, Illus. Lepid. Heter. Brit. Mus., vol. 4, 



1S79, p. 61 ; Trans. Ent. Soc. Lond., 1884, p. 142. 

 Thiodia argenticostana Feenald, in Dyar List N. Amer. Lepid., no. 5175. — 



Kearfott, Can. Ent., vol. 37, 1905, p. 45. 

 Eiicosma argenticostana Barnes and McDunnough, Check List Lepid. Bor. 



Amer., no. 709S, 1917. 



Male genitalia figured from typical specimen in National Collec- 

 tion from Olancha (Inyo County), California ("Apr. 24-30"). 



There is also in the National Collection a female cotype from 

 North Oregon and in the Barnes collection a couple of specimens 

 from Olancha, California. In all veins 3 and 4 of hind wings are 

 stalked. 



Alar expanse. — 15-21 mm. 



Type. — In British Museum. 



Type locality. — Northern Oregon. 



Food plant. — Unknown. 



40. TfflODIA SPICULANA (Zeller). 



OraphoUtha spiculana Zeller, Verb. Zool.-bot. Ges. Wien,, vol. 25, 1875, p. 289. 

 Thiodia spiculana Fernald, in Dj'ar List N. Amer. Lepid., no. 5176, 1903. — 



Kearfott, Can. Ent., vol. 37, 1905, p. 45. 

 Eucosma spiculana Barnes and McDunnough, Check List Lepid. Bor. Amer., 



no. 7064, 1917. 



The type in Cambridge is the only authentic specimen of this 

 species I have seen. Superficially it is much like clavana Fernald, 

 and specimens of the latter have been referred to Zeller's name. 

 The type, however, is in pattern — at least as far as the white costal 

 markings are concerned — more like argenticostana Walsingham, 

 which may very likely prove to be nothing but a western variety of 

 spiculana. The dark spot on costa near base shown in Zeller's figure, 

 but not mentioned in his description, is hot to be found on the type 

 specimen. 



Alar expanse. — 15 mm. 



Type. — In Museima Comparative of Zoology. 



Type locality. — Dallas, Texas. 



Food plant. — Unknown. 



41. TmODIA DORSIATOMANA Kearfott. 



(Fig. 109.) 



Thiodia dorsiatomana Kearfott, Can. Ent., vol. 37, 1905, pp. 44, 209. 

 Eucosma dorsiatomana Barnes and McDunnough, Check List Lepid. Bor. 

 Amer., no. 7079, 1917. 



Male genitalia figured from cotype in National Collection, from 

 Macleod, Alberta, Canada. 



