54 BULLETIN 123, UNITED STATES NATIONAL MUSEUM. 



34. THIODIA TENUIANA (Walsingham) . 



(Fig. 96.) 



Semasia tenuiana Walsingham, Illus. Lepid. Heter. Brit. Mus., vol. 4, 1879, p. 



59 ; Trans. Ent. Soc. Lond., 1884, p. 143. 

 Thiodia tenuiana Feenald, in Dyar List N. Amer. Lepid., no. 5178, 1903. — Not 



Kearfott, Can. Ent., vol. 37, 1905, pp. 46, 209. 

 Encosma temiiana Baenes and McDunnough, Check List Lepid. Bor. Amer. 



no. 7066, 1917. 



Kearfott has wrongly determined this species, most of his speci- 

 mens being referable to misturana Heinrich. The two species are 

 quite different as venation and genitalia show. There are two males 

 of the true tenuiana in the National Collection from Nevada County, 

 California (" Sept.") determined by Walsingham in 1886. I have 

 also found two like males among Kearfott's unworked specimens 

 from Stockton, Utah (" Tom Spalding," " IX-4-4," and "IX-11-4"). 

 In all four, veins 3 and 4 of hind wing are long stalked. 



Male genitalia figured from specimen in National Collection from 

 Nevada County, California. 



Alar expanse. — 14-18 mm. 



Type. — In British Museum. 



Type locality. — Siskiyou County, California. 



Food plant. — Unknown. 



35. THIODIA MISTURANA, new species. 



(Fig. 106.) 



Palpi extending one and one-half times the length of the head 

 beyond it; white dusted with gray, sometimes entirely gray. Face, 

 head and thorax white dusted with gray or entirelj^ gray. Fore 

 wing white or whitish, dusted and marked with gray or grayish 

 fuscous; along fold from base to near middle of wing a dark gray- 

 ish fuscous dash, more or less distinctly margined above by a streak 

 of the white ground color ; a faint outwardly angulate fascia extend- 

 ing from middle of costa to dorsal margin just behind ocelloid patch 

 and fusing more or less completely with a dark shading above 

 ocelloid patch; on costa between fascia and apex three or four 

 narrow, short, dark dashes interspaced with white streaks, the latter 

 fusing more or less below costa, and the last just before apex form- 

 ing a quite conspicuous white triangular spot; extreme apex dark; 

 ocellus white, containing two longitudinal and parallel black streaks ; 

 cilia white rather heavily dusted with dark gray. Hind wing with 

 veins 3 and 4 united ; pale smoky fuscous ; cilia paler. 



Male genitalia of type figured. 



Alar expanse. — 12-15 mm. 



Type.—Qsit. No. 24795, U.S.N.M. 



Paratypes. — In American Museum and collection Barnes. 



