NORTPI AMERICAN EUCOSMHSTAE. 37 



58. Alar expanse over 20 mm 59 



Alar expanse under 20 mm 62 



59. Basal two-thirds of fore wing above fold darker than rest of wing. 



(65) umbraticana. 

 Basal area above fold not darker than rest of wing 60 



60. Cilia of fore wing white with a moderately broad median fuscous band. 



(31) tarandana. 



Cilia of fore wing fuscous with a fine white sub-basal line and the tips of 



the scales white 61 



61. Fore wing with outer fascia and basal patch distinct (30) transversa. 



Fore wing with fascia and basal patch obsolete or nearly so_(29) elongana. 



62. Ground color of fore wing dark ashy gray 63 



Ground color of fore wing white or whitish 64 



63. Fore wing with two large well defined black spots on dorsum. 



(24) tomonana. 

 Fore wing without such (32) cinereolineana. 



64. Fore wing with a complete, outwardly angulate basal patch- (17) columbiana. 

 Basal patch disappearing above fold or altogether absent 65 



65. A strongly marked outwardly curved dark spot on dorsal margin of fore 



wing near base 66 



No such strongly marked spot on dorsal margin near base 67 



66. Inner dark spot on dorsal margin of fore wing reddish brown. 



(25) apacheana. 

 Inner dark dorsal spot dark gray-brown (26) influana. 



67. Basal half of costa shining white, unmarked (50) pallidicostana. 



Costa finely marked from base with fuscous dashes 68 



68. Hind wing uniformly pale smoky fuscous (19) delphinus. 



Hind wing whitish, shaded with fuscous only toward apex and outer 



margin ; 69 



69. Alar expanse 14 to 18 mm ; hind wing with veins 3 and 4 stalked 70 



Alar expanse 12 mm. or less ; hind wing with veins 3 and 4 united 71 



70. Palpi projecting nearly twice the length of the head beyond it. 



(34) tenuiana. 

 Palpi projecting no more than the length of the head beyond it. 



(33) migratana. 



71. Ground color of fore wing much obscured by fuscous markings giving wing 



a grayish white appearance (47) subminimana. 



White ground color but little obscured by fuscous markings; general color 

 much more white than gray (46) minimana. 



1. THIODIA RADIATANA ( Walsingham) . 

 (Fig. 75.) 



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



p. 55. 

 Thiodia radiatana Fernald, in Dyar List N. Amer. Lepid., no. 5163, 1903. — 



Keabfott, Proc. U. S. Nat. Mus., vol. 28, 1905, p. 359; Trans. Amer. Ent. 



Soc, vol. 33, 1907, pp. 37, 38. 

 EuGOsma radiatana Baenes and McDunnough, Check List Lepid. Bor. Amer., 



no. 7048, 1917. 



How many good species are represented by this and the following 



six names can be ascertained only by careful and extensive rearings. 



It is very doubtful if we have more than three or four, the others 



being at best but local races or color varieties. For the present, 



