THE PIERIDS 



before the margin of the wing (Fig. 27). Prevailing 

 colors white, p. 71. The Whites. 



AA. Vein M 2 of the front wings arising from the cross-vein 

 at the end of cell R+M, the apex of this cell not cut 

 off obliquely by it (Fig. 28) ; radius of front wings dis- 

 tinctly four- or five-branched (except in Nathalis, in which 

 it is only three- branched, but in this genus vein M 2 clearly 

 arises from the cross-vein, arising nearly midway between 

 veins M, and M 8 ). 



B. Lower side of hind wings marked with a greenish net- 

 work. Prevailing colors white, p. 81. 



The Orange-tips. 

 BB. Under side of hind wings not marked with a greenish 

 network. Prevailing colors yellow, or orange, p. 84. 



The Yellows. 



THE WHITES 



The more common representatives of this group are the 

 well-known cabbage-butterflies ; in fact, all of the species that 

 occur in the eastern United States feed upon cabbage and al- 

 lied plants. They are white butterflies more or less marked 

 with black ; occasionally the white is tinged with yellow, and 

 yellow varieties of our white species sometimes appear. 



Our Eastern forms can be separated by the following table : 



A. Unusually large species, expanding from two to three 

 inches. (J 3 , monuste), p. 72. 



The Great Southern White. 

 AA. Smaller species, expanding about two inches or less. 



B. With a black bar at the end of cell R + M. (P. pro- 

 todice), p. 73. The Checkered White. 



71 



