1887. ] PROCEKDINGS OF UNITED STATES NATIONAL MUSEUM. 455 



narrow, slightly indented at outer side. Secondaries dirty whitish gray. 

 Beneath grayish, powdery. Expands 1.20-1.'_'5 inches (30-32 ">'"). 



Habitat. — Montana, Black Hills. 



Four $ specimens from collections Keumoegen, Graef, and Hulst. 

 Xo S specimens seen, but the antenna) will undoubtedly be found to be 

 serrate and bristled, and the clasper bifurcate. In appearance the 

 species resembles idahoensis, which, however, belongs to another group. 

 The present species belongs to the grouj) quadridentata, and is closely 

 related to olivalis and playigera^ differing, however, from all others in 

 the group by the evenly gray costal margin and ordinary spots. 



A. flavidens Smith, n. sp. 



Anterior tibia spinose, moderately armed at tip; clypeuswithan ovate 

 projection, depressed in the center; antennaB of $ serrate and bristled, 

 $ side piece and clasper as in tetrica. Thorax quadrate, collar nar- 

 rowly lined, pategi<e margined with black, the low, divided fore and aft 

 tufts paler. Primaries blackish brown, s. t. space paler, costal region 

 to t. p. line discolorous, yellowish ; a clear yellow dash through sub- 

 median space, reaching the s. t. line ; a subapical whitish patch; on 

 veins 3 and 4 two sagittate white dashes cross the s. t. space and in- 

 dent the s. t. line. T. a. line geminate, included space pale, not cross- 

 ing pale costa, outwardly curved below median vein to v. 1, and then ob- 

 liquely to the hind margin. T. p. line simple, lunulate, parallel with 

 outer margin. S. t. line narrow, pale, even except on veins 3 and 4. Basal 

 black dash i)resent. Claviform long, concolorous, outlined in black. 

 Ordinary spots complete, outlined in black, then with a clear yellow an- 

 nulus; center umber brown; orbicular oval, slightly oblique; reniform, 

 kidney shaped. Secondaries dusky, paler towards base. Beneath 

 dusky, powdery. Expands 1.35-1.50 inches (35-38™""). 



Habitat. — Arizona, Colorado. 



Two $ and one $ in collection Graef and iSTeumoegeu. This is the 

 largest and best marked species in the group 4-dentata, and it bears a 

 considerable resemblance in marking to the subgothica group, having, 

 however, the structural characters of the tirst-meutioned group. 



A. brevipennis Smith, sp. nov. 



Structural characters like those of oblongistifjma and famdens, and 

 like them belonging to the 4:-detitata group. Primaries ash gray, with 

 somewhat darker shadings through center and in terminal space. Or- 

 bicular oblique, open superiorly; reniform oblique, elongate, somewhat 

 constricted at middle. Both the ordinary spots are defined by a narrow 

 black line and a paler interior ring; else concolorous. Claviform very dis- 

 tinctly outlined. Transverse lines faint, in one specimen entirely obso- 

 lete. T. a. line geminate, visible only in submedian space. T. p. line 

 obsolete. S. t. line white, indefinite, indented to half the extent of 

 terminal space on veins 3 and 4, by the pale sagittate marks peculiar 

 to this group. Apex pale. Secondaries white, with blackish terminal 



