74 UNITED STATES NATIONAL MUSEtHVI BULLETIN 276 



Color variable, but not medium chocolate-brown and dusted 

 with whitish-yellow scales in the distributional area described 

 above; lines on forewings light or dark, with or without 

 indentations along the veins; median area variable; genital 

 plate variably sclerotized; ovipositor lobes variable, but not 

 as in figures 86 and 87; distribution — ^western and northern 

 North America 5 



4(3). Lines on forewings usually not sharply contrasting with ground 

 color (figs. 154, 157, and 160); distribution — south of a line 

 drawn from Indio, Riverside Co., Calif., along the southern 

 base of the San Bernardino and San Gabriel Mountains 



(fig. 4) constrictum austrinum, p. 99 



Lines on forewings usually more sharply contrasting with ground 

 color (figs. 142, 145, 148, and 151); distribution — north of a 

 line drawn from Indio, Riverside Co., Calif., along the 

 southern base of the San Bernardino and San Gabriel Moun- 

 tains (fig. 4) constrictum constrictum, p. 93 



5(3). Color reddish-brown to orange-yellow-brown, dusted with 

 yellowish scales; lines dark, only slightly bowed outward and 

 without indentations along veins (females in figs. 161-175); 

 ovipositor lobes as in figures 84 and 85 with the dorsal and 

 ventral lobes about equal and with a distinct concavity 

 between them as in fig. 84; distribution — Colorado, Utah, 

 Arizona, New Mexico, Texas, Mexico, and possibly adjoining 



areas (fig. 1) tigris, p. 102 



Color variable, but usually orange-brown, gray-brown, yellow- 

 brown, or chocolate-brown; lines dark or light, usually 

 definitely bowed outv.^ard (especially the outer line), often 

 with conspicuous indentations as in figure 281; ovipositor 

 lobes never like figure 84; distribution — western and northern 

 North America including Mexico 6 



6(5)*. Color usually gray-white and chocolate-brown, sometimes with 

 a yellowish or orange tint in specimens from the edge of the 

 distributional limits; lines on forewings usually with many 

 indentations along the veins which often appear rather "jagged" 

 as in figures 281, 283, and 284; distribution — Mqjave Desert 

 area of California, Arizona, Nevada, Utah, and the southern 



*As with the males, there are no known structural characters which will separate 

 the two species and their subspecies which make up the rest of this key. In some 

 cases the subspecies are recognized on the basis of larval diflferences, but no matter 

 which characters are used, it is not possible to identify some specimens. This is 

 especially true of females. 



