264 BULLETIN 123, UNITED STATES NATIONAL MUSEUM. 



gray areas most distinctly defined as a dark basal patch which be- 

 comes obsolete toward costa and a dark fascia from mid costa to 

 dorsum before tornus and two or three triangular spots on outer 

 half of costa, the latter interspaced with pairs of rather long, fine,, 

 white lines ; the white dusting in fresh specimens is pretty well scat- 

 tered over the whole wing but is most obvious on mid dorsum (as a 

 faint square patch), in tornal area and along costa toward apex; 

 ocelloid patch white with two short black streaks; cilia white, with 

 a fine black subbasal line and an outer dusting of blackish fuscous 

 scaling. Hind wing whitish with a fuscous shading along termen 

 and toward apex; cilia white with a dark basal band and toward 

 apex with a median dark shading; veins 3 and 4 united. 



Right harpe of male genitalia figured. 



Alar expanse. — 11-15 mm. 



Type. — In collection Barnes. 



Paratypes. — Cat. No. 25614 U.S.N.M. Also in American Museum 

 and collection Barnes. 



Type locality. — Eureka, Utah. 



Food plant. — Unknown. 



Described from male type, five male and two female paratypes 

 from the type locality ("Tom Spalding, V — 30-11"), one male 

 paratype from Stockton, Utah ("Tom Spalding, V — 24-04"), one 

 male paratype from Olancha, California ("June 16-23"), and. 

 five male and one female paratypes from Verdi, Nevada ("A. H. 

 Vachell, June 1-10 "). The paratypes from Nevada average smaller 

 than the others and may possibly represent a local race. At present, 

 however, there seems to be no reason for distinguishing it by a 

 separate name. 



In our key the species would run down to alternative 69. It is 

 nearest tenuiana and migratana in pattern and markings but dis- 

 tinct from anything in the genus in the shape of its harpes. 



THIODIA FERTORIANA, new species. 



(Fig. 423.) 



In pattern much alike misturana Heinrich but quite different in 

 genitalia. The ground color of the fore wing is dark gray rather 

 than white, the white geminations @n outer half of costa are longer 

 and the median white streak is both longer and more obscure than in 

 misturana^ being interrupted longitudinally by a streak of blackish 

 dusting. The coloring of the cilia of fore wings is also different. 

 In fertoriana at extreme base, edging the termen, there is a narrow 

 black line outwardly bordered by a narrow white band ; beyond this 

 the cilia are dark grayish fuscous. In inisturana on the other hand 

 there are no such contrasting white and black lines, the cilia being 



