THE PIERIDS 



home in the southwest United States and Mexico, 

 and is found in the Colorado Mountains at the 

 height of eight thousand feet. However, it has 

 not yet adapted itself sufficiently to the climatic 

 condition of Colorado to belong to the successful 

 of that great State ; for very often the first frosts 

 kill the food-plant when the caterpillars of the last 

 brood are not more than half grown and they die 

 the ignoble death of the great unfit ; and for two 

 years thereafter no more dainty sulphurs gladden 

 that region. 



" Those old days when the balancing of a yellow butterfly 

 over a thistle bloom was spiritual food and lodging for a 

 whole forenoon." Lowell. 



The Red-barred Sulphur 

 Callidryas philca (Cal-lid'ry-as phil'e-a) 

 Plate XVI, Fig. i 



This is the largest of all the yellows found in the eastern 

 United States, the wings expanding from three inches to 

 nearly four inches. The wings are bright yellow above with 

 a large orange patch in the male crossing cell R + M of the 

 front wings somewhat beyond the middle of the cell ; and 

 with the outer margin of the hind wings orange in both sexes. 

 In the female there is a row of dark-brown spots along the 

 outer third of the costa of the front wings and along the outer 

 margin of both wings; and on the fore wings there is a sub- 

 marginal row of nine spots in cells R, to CUj. 



8 7 



