LEPIDOPTERA PAPILIONIDAE COLIAS SCUDDERII. 749 



COLIAS ALEXANDRA, Edw. 



Colias Alexandra, EDW., Butterflies N. A., i. 



This species was brought from the South Park, Colorado, by the expe- 

 dition in 1873. The species appears about the middle of June, and for a 

 time is abundant on all the headwaters of the Platte. Occasionally it may 

 be taken on the Upper Arkansas, though there it is largely replaced by C. 

 Scudderii. 



The eggs are deposited on wild lupines, and the young larva closely 

 resembles that of Philodice. By the last of August, the species has quite dis- 

 appeared. There is but one brood in the season. 



t COLIAS EDWARDSII, Behr. 



Colias Edwardsii, EDW., Butterflies N. A., i. 



Specimens were taken by the expedition at Owen's Lake, California. 

 Concerning the species, Mr. Henry Edwards writes as follows : 



" How far this may be found in a long series to differ from C. Alexandra, 

 I am unable to determine at present. It may probably prove to be an 

 extreme variety. It is only known to me from Virginia City, Nev., where 

 it frequents the sides of mountains, flying with great rapidity, and evidently 

 delighting in long and restless flights. It makes its first appearance about 

 the beginning of April, and continues on the wing to the end of June. It 

 is decidedly a rare insect." 



COLIAS SCUDDEEII, Reakirt. 

 Colias Scudderii, EDW., Butterflies N. A., i. 



C. Scudderii was found by the expedition at Twin Lakes, Colorado, 

 where it is not uncommon in July, appearing a little later than Alexandra. 

 Nearly all the females of Scudderii are albinoes, while in Alexandra white 

 females are the rare exception. 



A female, C. Scudderii, apparently mature, was inclosed in a box with 

 dwarf lupines, but refused to lay eggs, although Alexandra laid freely upon 

 the same. This would indicate that the species have different food plants, 

 though of course the experiment is not conclusive. 



