44 BULLETIN 123, UNITED STATES NATIONAL MUSEUM. 



16. THIODIA DECEMPUNCTANA (Walsingham) . 



(Fig. 120.) 



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



1879, p. 58. 

 Thiodia decempunctana Fernatd, in Dyar List N. Amer. Lepid., no. 5185, 1903. 

 Eucosma decempunctana Babnes and McDunnough, Check List Lepid. Bor. 



Amer., no. 7980, 1917. 



Male genitalia figured from cotype in National Collection. 

 There is one other specimen without locality label in the Kearfott 

 collection at the American Museum. 

 Alar expanse. — 13-18 mm. 

 Type. — In British Museum. 

 Type locality. — The Dalles, Oregon. 

 Food plant. — Unknown. 



17. THIODIA COLUMBIANA (Walsingham). 



(Fig. 121.) 



Semasia columhiana Waxsingham, Illus. Lepid. Heter. Brit. Mus., vol. 4, 



1879, p. 57. 

 Thiodia columMana Feenald, in Dyar List N. Amer. Lepid., no. 5187, 1903. 

 Eucosma columMana Babnes and McDunnough, Check List Lepid. Bor. Amer., 



no. 7082, 1917. 



Male genitalia figured from cotype in National Collection. 



The only authentic specimens of this species I have seen aside from 

 the cotype are a few from Doctor Barnes' unworked material col- 

 lected at Vineyard, Utah, by Tom Spaulding. Examples of those 

 are now in National Collection, American Museum and collection 

 Barnes. 



Alar expanse. — 13-17 mm. 



Type. — British Museum. 



Type locality. — North Oregon, near Columbia River. 



Food plant. — ^Unknown. 



18. THIODIA MORMONENSIS, new species. 



(Fig. 129.) 



Antenna pale grayish ochreous; basal joint cream colored. Palpus 

 pale ochreous white; terminal joint fuscous. Face pale ochreous 

 white. Head and thorax ochreous. Fore wing ochreous but 

 shading a trifle darker than head and thorax except at extreme base 

 of wing, along basal half of costa and on middle of dorsal margin 

 where there is a large obscure triangular spot reaching into cell, this 

 last and the base of wing and basal half of costa are the same light 

 ochreous shade as the head and thorax; costa with a dozen or so 

 faint fuscous dashes between base and apex, towards apex these are 



