Genus Colias 



typical form of the species. We have given, in addition to these, 

 the following forms: 



(a) Winter form ariadne, Edwards, Plate XXXVI, Fig. 7, $ ; 

 Fig. 8, ? . This form, emerging from chrysalids which have 

 overwintered, is like the type in having the fore wings tinged 

 with orange. Expanse, 1.75 inch. 



(b) Winter form keewaydin, Edwards, Plate XXXVI, Fig. 9, 

 $ ; Fig. 10, $ . This is a larger form, more deeply flushed with 

 orange, though not quite as deeply as shown in the plate. Ex- 

 panse, 1.85 inch. 



(c) Summer form eriphyle, Edwards, Plate XXXV, Fig. 15, $ ; 

 Plate XLIII, Fig. 3, $ , under side. This summer form differs from 

 typical C. eurytheme in being yellow and not laved with orange. 

 Expanse, 2.00 inches. 



Early Stages. — The caterpillar feeds on clover, as do most of 

 the species of the genus. 



The range of eurytheme is very wide. It extends from the 

 Atlantic to the Pacific, and from Canada to the far South, though 

 rare in the lower parts of Florida and Texas in the hot lands. 



(4) Colias philodice, Godart, Plate I (Frontispiece), Fig. 4, 

 $ ; Fig. 5, 9 ; Plate II, Fig. 10, larva; Plate V, Figs. 54, 55, 

 chrysalis (The Common Sulphur). 



Butterfly. — We are all familiar with this species, the " puddle 

 butterfly " of our childhood, which sits in swarms on moist 

 places by the wayside, and makes the clover-fields gay with the 

 flash of yellow wings in summer. There are many aberrational 

 forms, albinos and negroes, white forms and dark forms, dwarfed 

 forms and large forms, but in the main the species is remarkably 

 constant, and seasonal forms and distinctly local races do not 

 abound as in the case of the preceding species. Expanse, $ , 

 1. 25-1. 80 inch; $, 1.60-2.25 inches. 



Early Stages. — The food-plant is clover. The eggs are pale 

 yellow, changing, after being laid, to crimson. The caterpillar 

 is slender, green, striped longitudinally with paler green. The 

 chrysalis is pale green. 



The species ranges from New England to Florida, and west- 

 ward to the Rocky Mountains. 



(<-,) Colias chrysomelas, Henry Edwards, Plate XXXV, Fig. 

 12, $ ; Fig. 13, ? (The Gold-and-black Sulphur). 



Butterfly. — Larger than C. philodice. The male on the upper 



291 



