HOW TO KNOW THE BUTTERFLIES 



for a considerable distance beyond the apex of cell R + M; 

 and only three or four of the branches of radius remain dis- 

 tinct. 



In this family the fore legs are well-developed in both sexes, 

 there being no tendency to their reduction in size, as in the 



following families. 



The larvse are usually 

 slender, green worms 

 clothed with short, fine 

 hairs ; the well-known cab- 

 bage-worms are typical il- 

 lustrations. 



The chrysalids are sup- 

 ported by the tail and by 

 a loose girth around the 

 middle. They can be dis- 

 tinguished at a glance by 

 the presence of a single 

 pointed projection in front. 

 (Plate III, Fig. 3.) 



In order to facilitate the 

 study of the family, our 

 genera can be separated, somewhat arbitrarily, into three 

 groups ; these are the Whites, the Orange-tips, and the Yel- 

 lows. In the first two groups the prevailing color is white ; in 

 the third, it is either yellow or orange. These groups can be 

 separated as follows : 



A. Vein M„ of the front wings arising from radius, and 

 cutting off obliquely the apex of cell R + M; radius of 

 the front wings only three-branched, or if four-branched 

 with one branch (vein RJ exceedingly short, arising just 



70 



Fig. 28. — Venation of the wings of 

 Riirymus philodicc. 



