THE TRIBE OF THE YELLOWS 105 



industry which has since become so important in that 

 region. The butterfly thus brought to hght has been 

 found to be a characteristic northern species, occupying 

 a rather narrow belt nearly along the fiftieth degree of 

 latitude and extending west almost to the Pacific Coast. 

 The species is occasionally taken as far south as the White 

 Mountains and there are indications that in this region 

 there are two broods a year. The male butterflies are 

 known at once by a beautiful pink edge on all the margins; 

 they bear otherwise a close resemblance to our common 

 Sulphur Yellow. The females are much lighter in color, 

 often having no black markings on the upper surface of 

 the hind wings. 



The Black-bordered Yellow 



Eurema nicippe 



This is essentially a tropical butterfly which has spread 

 out over most of our Southern states where it is abundant 

 and widely distributed » It adds a distinct touch of color 

 and life to many landscapes when the butterflies swarm 

 by thousands upon clover blossoms and other low vege- 

 tation. The eggs are laid upon the leaves of clover and 

 more especially upon some common species of Cassia, 

 such as wild senna. Each egg soon hatches into a small 

 greenish cylindrical worm, colored and striped in such a 

 way that as it rests upon the leaf it is easily overlooked. 

 This larva develops rapidly and soon becomes about an 

 inch and a quarter long, being rather slender and fairly 

 smooth. It now spins a bit of silk upon a twig or some 

 similar support and also the frailest sort of a silken loop 



