NORTH AMERICAN EUCOSMINAE. 65 



54. THIODIA SCALANA (Walsingham). 

 (Fig. 124.) 



Samasia scalana Walsingham, Illus. Lepid. Heter. Brit. Mus., vol. 4, 1879, p. 57! 

 Thiodia scalana Fernald, in Dyar List N. Amer. Lepid., no. 5188, 1903. 

 Eucosma scalmia Barnes and McDtjnnough, Cheek List Lepid. Bor. Amer., no. 

 7083, 1917. 



There is a female of this species in the National Collection deter- 

 mined by Walsingham from Alameda County, California (April). 

 It has veins 3 and 4 of hind wing united. The only other specimens 

 I have seen are four without locality labels (two males and two 

 females) in the Fernald collection at Amherst, Massachusetts. A 

 male from this series is now in the National Collection as a gift of 

 Dr. H. T. Fernald. 



Male genitalia figured from specimen in National Collection. 



AJar expanse. — 16 mm. 



Type. — In British Museum. 



Type locality. — " Borders of California and Oregon." 



Food plant. — Unknown. 



55. THIODIA MONTANANA (Walsingham). 

 (Fig. 113.) 



Semasia montanana Walsingham, Trans. Ent. See. Lond., 1884, p. 143. 

 Thiodia montanana Fernald, in Dyar List N. Amer. Lepid., no. 5200, 1903. 

 Thiodia triangulana Keabfott, Can. Ent., vol. 37, 1905, pp. 46, 209. 

 Eucosma montanana Barnes and McDunnotjgh, Check List Lepid. Bor. Amer., 



no. 7100, 1917. 

 Eucosma triangulana Barnes and McDunnough, Cheek List Lepid. Bor. Amer., 



no. 7104, 1917. 



Kearfott's triangulana agrees in genitalia and pattern with speci- 

 mens he identified as montanana^ and both agree with Walsingham's 

 description and figure. The two do not even appear to be distin- 

 guishable as varieties. Veins 3 and 4 of hind wing are stalked. 

 The larva of montanana^ according to data on a reared specimen 

 recently received from Mr. L. P. Rockwood, of Forest Grove, Oregon, 

 bores in the roots of " sage brush " {^^ Artemisia dracunculo "). 



Male genitalia figured from cotype of triangulana in National Col- 

 lection from Aweme, Manitoba. 



Distribution according to specimens in National Collection, Ameri- 

 can Museum and collection Barnes: Manitoba, Saskatchewan, 

 Oregon, Colorado. 



Alar expanse. — 18-25 mm. 



Types. — In British Museum {montanana) ; American Museum 

 ( triangulana) . 



Type localities. — Montana {montanana) ; Beulah, Manitoba 

 ( triangulana) . 



Food plant. — Artemisia dracunculo. 



