BUTTERFLIES OF MONTANA. 31 



which he says are absolutely indistinguishable from European specimens 

 in color and markings. 



Var. pallida, Scudder. The wings are white above and below, with 

 small black spot on the fore wing of the female above, and hardly any 

 trace of dark shading along the veins on the under side; a trace of dark 

 on the hinder edge and base of fore wings. One specimen taken at Flat- 

 head Lake, August, 1903. One taken in the big meadows at the upper 

 end of Swan Lake, August 8, 1904. 



Var. acadica, Edwards. The veins of the wings have narrow border 

 above and below of blackish, more pronounced in the female, base of 

 wings and sometimes the tips dusky. The under side in both sexes and 

 the upper side in the female are distinctly yellowish. Specimens from 

 Montana have been examined as follows: One from Helena (Brandegee) 

 June 26, 1902; four from Missoula, one April 28, 1900, one June 1, 1900, 

 one June 12 1899 one October 1897; one from Bozeman (Cooley) ; three 

 from Miles City (Wiley). 



THE CALIFORNIA WHITE. 

 Pontia sisymbri, Boiduval Fig. 28. 



Butterfly Expanse of male, 1.2 to 1.6 inches, 33 to 40 mm.; female, 

 1.6 to 2.00, 40 to 50 mm. Upper side of male white with a faint yellow 

 tint; bases of wings dusted with black; primaries have the costal margin 

 gray for three-fifths the length from base; the ends of the nervules from 

 apex to second branch of median covered by 

 black bars, which diminish gradually in length 

 down the margin; midway between margin 

 and cell is a transverse black band, inter- 

 rupted opposite cell, and running from costa 

 to upper median interspace; in the arc a 

 black bar, indented on outer side; secondaries 

 immaculate; fringes of both wings white; 

 Fig 28. Pontia Sisymbri. black at the ends of the veins. 



Under side same color; the markings repeated, but paler or gray, 

 the bars along margin of primaries greenish-gray. 



Body gray above, thorax white below, abdomen yellowish; legs 

 white, palpi white with black hairs in front; antennae black above, 

 whitish beneath; club black, the tip orange, 

 Female similar to male. 



Early Stages The eggs are long, narrow, conical, the base and top 

 flattened, depressed; ribbed longitudinally, and crossed by numerous 

 striae; color when first laid yellow, shortly before the end of the stage 

 red. Mature larva about .9 inch, 25 mm., color light yellow crossed with 

 stripes of black. The caterpillar feeds upon the cruciferae. 



Distribution Found in Colorado and the Pacific states. Collected 

 by Elrod at Missoula. 



