AMERICAN LEPIDOPTERA. 77 



tively shorter. In the secondaries the venation is like cretata, save 

 that vein 5 is a little neai-er the branching of 3 and 4, which is at 

 the end of the cell. 



Acontia elegantiila Harvey. 



1876, Harv., Can. Ent., viii, 5.5, Thalpochares. 



1880, Grt., Can. Ent., xi, 58, Thalpochares. 



1882, Grt., New List, 37, Tarache. 



1893, Smith, Bull. 44, U. S. Nat. Mus., 300, Acontia. 

 semiopaca Grote. 



1878, Grt., Bull. Geol. Surv., iv, 182, Tarache. 



1882, Grt., New List, 37, pr. syn. 

 arizonse Hy. Edwards. 



1878, Hy. Edw., Pacific Coast Lep., No. 29, 7, Thalpochares. 



1880, Grt., Can. Ent., xii, 58, Thalpochares. 



1882, Grt., New List, 37, Tarache. 



1893, Smith, Bull. 44, U. S. Nat. Mus., 300, Acontia. 

 seminivealis Hulst. 



1886, Hulst, Trans. Am. Ent. Soc, xiii, 1.57, Orobsena. 



1893, Smith, Bull. 44, U. S. Nat. Mus., 300, pr. syn. 

 Head, thorax and abdomen white or creamy. Primaries white or creamy from 

 base to the upright luteons brown median shade, and beyond the wing is luteous, 

 varying to gray. S. t. line marked by a pale cloud on the costa and more or less 

 obscurely traceable as a sinuate, broken pale line. S. t. line whitish, a little sinu- 

 ate, rarely complete, sometimes marked only at the costa and on inner margin. 

 A series of small terminal lunules. Orbicular wanting. Reniform round, gray, 

 narrowly annulate with pale. Secondaries white or nearly so, iridescent, a little 

 smoky outwardly. Beneath, primaries yellowish, outer half a little darker; 

 secondaries white. 



Expands 17-22 mm. = .68-.88 inches. 



Hab. — Montana, June ; Nevada ; Colorado ; Phoenix, Arizona, 

 March 12th (Griffith); Argus Mountains, April (Koebele) ; Hot 

 Springs, New Mexico, 7000 ft. (Hulst) ; California. 



Three males and nine females before me. The species ranges 

 considerably in size, and it is the smaller form that Edwards con- 

 sidered as distinct under the name arizonce. This is also the same 

 as Hulst's seminivealis. 



Aside from this, there is not very much I'eal variation. The 

 outer darker space differs a little in ground color, and the t. p. and 

 s, t. Hnes ai"e more or less incomplete ; but none of these affects the 

 general appearance of the species. 



As a matter of fact this species is better referred to Thalpochares, 

 because, in all the specimens examined, the acces.sory cell of prima- 

 ries is wanting. Of course, this occurs — exceptionally — in other 

 species, but it seems here to be the rule. As Mr. Grote has referred 



TRANS. AM. ENT. SOC, XXVII. SEPTEMBER, 1900. 



