362 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 38. 



The outer or extradiscal line begins about one-fourth in from the 

 apex, follows in general the course of the outer margin of the wing 

 and may he either gently waved or strongly undulated, one outward 

 wave being between K- and Cu, and another between Cu 2 and the 

 anal vein: the inward wave produced by the union of these two is 

 larger and deeper than either of the outward ones. The secondaries 

 are divided into two regions by a straight, slightly curved, undulate 

 or denticulate li no which crosses the wing outward of the middle 

 and terminates at the inner margin at a variable distance from the 

 anal angle. 



The genitalia when mounted on slides are more or less triangular 

 or pentagonal in form and display excellent characters for the sepa- 

 ration of the species. The apical-inner margin of the harpes, hearing 

 what by analogy should he the elasper, is very characteristically 

 shaped and affords the best means of distinguishing between the 

 various species. The spreading out and mounting of the genitalia 

 apparently does not in the least interfere with the shape of the 

 structure, and in a series of ten mounts of one species all were prac- 

 tically alike. This was true of the other species, and constancy of 

 form is the rule with all the parts of this structure. The uncus 

 may he straight or slightly bent according to the species. The 

 scaphium usually offers something that is distinctive. The penis 

 may or may not have an apical process which is much alike in related 

 specie-. 



TABLE <)l' SPECIES. 



1 . Speciea variegated with brown, yellow, and olivaceous 2 



Species nol variegated or, Lf so, entirely lacking the olivaceous tint 3 



2. Ground color of primaries bright yellowish or faintly yellowish-olivaceous, the 



inner cross line relieved; shadings burnt brown morrisonatUS. 



Ground color of primaries whitish and decidedly olivaceous, the inner cross 

 line almost losl in the shading below cell; shadings chocolate-brown with 



purplish cast marmoratus. 



:\. Species large, 45 nun. or over in expanse giganh us. 



Species smaller, to nun. or less in expanse 4 



I. Outer line of primaries very strongly sinuous modestus. 



( Inter line of primaries gently and smoothly waved 5 



5 Ground color of wings granite-trray; median hand of primaries deep fawn- 



brown bilni nsiii ins. 



Species uol so colored (i 



<;. Primaries scattered over with cinereous scales, outer line externally and inner 



line internally bordered by :i aarroM cinereous line occult ntalis. 



Prima tie- without cinereous Bcales 7 



7. Ground color of wings creamy orwhil ish-gray; shadings yellowish -I >row n. Colorado. 



Ground color of wings stone or bluish gray or reddish-brown 8 



s. Male with grayish shadings and a yellowish patch opposite discal Bpot; 



female with bright reddish-brown shadings /« plarioides. 



Male with black shadings; female with reddish-brown shadings with an 

 umber hue hones tarius. 



