66 BULLETIN 123, UNITED STATES NATIONAL MUSEUM. 



66. THIODIA BBNJAMINI, new species. 



(Fig. 114.) 



Close to montanana Walsingham with which it agrees in genitalia 

 but strikingly different in color. Outer sides of palpi, thorax and 

 fore wings rust red strongly inclining to yellowish. Head, face and 

 inner sides of palpi somewhat paler. Fore wings nearly unicolorous ; 

 pattern in paler specimens as in montanana (with a slightly darker, 

 angulate, outer fascia and a basal half patch at inner dorsal angle) 

 but nearly obsolete, completely so in darker specimens ; cilia rust red. 

 Hind wings with veins 3 and 4 stalked; pale smoky fuscous; cilia 

 slightly paler. 



Male genitalia of type figured. 



Alar expanse. — 22.5-26 mm. 



Type. — In collection Barnes. 



Paratypes. — Cat. No. 24802, U.S.N'.M, Also in American Museum 

 and collection Barnes. 



Type locality. — Vineyard, Utah. 



Food plant. — Unknown. 



Described from male type and ten male paratypes collected at Vine- 

 yard, Utah, by Tom Spalding and dated as follows : Type, " IX- 

 12-11"; 1 specimen, "IX-6-11"; 8 specimens, "IX-11-11"; speci- 

 men, " IX-13-11 " ; all from Doctor Barnes' collection. 



It is possible that this may prove to be a variety of montanana. 

 The color, however, is very different and it will at least require 

 varietal separation. It is a striking and easily recognized form. 



I take pleasure in naming it after Dr. Marcus Benjamin, as a slight 

 acknowledgment of many courtesies. 



57. THIODIA GRISEOCAPITANA (Walsinerham) . 

 (Fig. 92.) 



Seniasia griseocapitana Walsingham, Illiis. Lepid. Heter. Brit. Miis., vol. 4, 



1879, p. 61. 

 Thiodia griseocapitana Fernald, in Dyar List N. Amer. Lepid., no. 5181, 1903. 

 Eucosma griseocapitana Baenes and McCunnough, Check List Lepid. Bor. 



Amer., no. 7069, 1917. 



There is a female cotype of this species in the National Collection. 



Male genitalia figured from specimen in National Collection from 

 Denver, Colorado. 



Distribution according to specimens in National Collection, Ameri- 

 can Museum, and collection Barnes: California, Colorado, Utah, 



All have veins 3 and 4 of hind wings stalked. 



Alar expanse. — 16-18 mm. 



Type. — In British Museum. 



Type locality. — Mount Shasta, California. 



Food plant. — Unknown. 



