100 BULLETIN 38, UNITED STATES NATIONAL MUSEUM. 



Transverse lines aud ordinary spots very faint; clavifonn wanting; size ninch 



smaller inconcinna. 



Abdunien less depressed, conic ; color dark fuscous brown. 



Costa reddish; cell between ordinary spots black teurkaijs. 



Chorizagrotis auxiliaris Grt, 



1872. Grt., Buff. Bull., i, 96, Aurotis. 



1875. Grt., Proc. Ac. Nat. Sci., Phil., 1875, 422 Agrotis. 



1875. Grt., Bull. U. S. Geol. Surv., in, 118, Agrotis. 



Fnsco liiteous ; costal aud interior margin, s. t. space, except at costa, 

 a subiiiedian dash, aud ordinary spots yellow; the latter powdered 

 with white. Median vein white, other veins marked with dusky. A 

 black basal mark, reaching t. a. line; the latter geminate, outer liue 

 black, included space yellow, visible only between median and s. m. 

 vein. T. p. line single, punctiform, parallel to outer margin. S. t. line 

 narrow, white sinuate and dentate, an apical whitish jiatch. Terminal 

 space somewhat darker. Ordinary spots distinct, powdered with white 

 scales. Orbicular oblique ovate, moderate in size. Reniform large, 

 kidney-shaped. All before and between ordinary spots dusky. Clavi- 

 form distinctly outlined, concolorous reaching almost to the middle of 

 median space. Secondaries smoky fuscous, somewhat i)aler at base. 

 Beneath dusky, powdery ; secondaries more whitisli. A common line 

 and discal lunule on all wings. Collar interiorly yellow. Head and 

 throax concolorous. 



Expands 44-50""" ; 1,75-2 inches. 



Habitat.— Colorado, Texas, California. 



An easily recognized species : The primaries are unusually elongate 

 and subeqnal, even for this grouj), and the bright yellow maculation 

 and whitish ordinary spots are characteristic. This species was in 

 Professor Lintner's collection ni^ penwceUenH. 



Many of the specimens named auxiliaris in collections are really 

 referable to the next species. 



Chorizagrotis introferens Grt. 



1875. Grt., Proc. Ac. Nat. Sci., Phil., 1875, 42:3 Agrotis. 

 1870. Harv., Buff. Bull., iii, 74, pi. 3, f. 10, Agrotis 



In maculation like auxiliaris ; but this species smaller in size; the 

 yellow is sordid, often sprinkled with bluish gray, and the balance of 

 the wing is but little darker and not contrasting. Secondaries and 

 under side as in auxiliaris. Collar dull luteoQs. 



Expands 40-44"'"' ; l.GO-1.75 inches. 



Habitat. — Colorado, Texas, California, Arizona. 



Very closely allied to anxiliarisj than which it is much mere com- 

 mon. So closely are the two allied that but for the very distinct vari- 

 ance in the male genitalia I should have called them identical; yet 



