BUTTERFLIES OF MONTANA. 



29 



Fig. 25, Pontia protodice. 



Its food consists of cruciferous plants. It is destructive to cabbage. 

 THE WESTERN WHITE, Pontia occidental is Reakirt 



Butterfly — Size about 1.75 inches, distinguished from P. protodice by 

 its smaller size and different markings. On the under side of the wings 

 the dark markings are not concentrated in blotches, but are in broad 

 longitudinal rays on either side of the veins from the base to the outer 

 margin. Spots on the upper side much smaller than in protodice, and 

 fewer. The females are sometimes lemon yellow above. 



Early Stages — Similar to those of protodice. 



Distribution — It is found from the Rocky Mountains to the Pacific. 

 Wiley has it in his collection from Miles City; Cooley has taken it at 

 Bozeman; Brandegee at Helena; Douglass at Madison Lakes; Elrod at 

 Missoula, and on MacDougal Peak. It is likely to be found any place in 

 the state. Allen has taken it at Dillon. Coues collected it in 1874 along 

 the 49th parallel. 



THE CABBAGE BUTTERFLY. Pontia rapae. Linnaeus. Fig. 26. 



Fig. 2li. Pontia rapae; upper figures show both surfaces of female, 

 lower fisrures same for male. 



