No. 533] INHERITANCE IN COLIAS PHILODICE 261 



unusually clear hue, and quite unlike the color of the 

 mother. 



The progeny of this female show that, supposing her 

 to have mated with a pure yellow male not carrying 

 white, as was probably the case, she is a heterozygote for 



color, potentially white, though modified probably by the 

 effect of cold upon the chrysalis in early spring into a 

 form strikingly like that of the Arctic species, Colias 

 nastes. I hope to ascertain from caterpillars now hiber- 

 nating whether this spring form may be produced at will 

 from larvae from a white mother by the action of cold 

 upon the chrysalis. 



My attention was attracted to the problem of inherit- 

 ance of the white color in this species by certain state- 

 ments in Edwards's great work on the "Butterflies of 

 North America." He says that the progeny of an albino 

 female are partly albino and partly yellow, or it may be 

 all yellow. "In one instance," he says, "I had five 

 butterflies from eggs laid by an albino, and there re- 

 sulted one male and four yellow females, no albino. 



