Genus Colias 



insect is peculiar to the Pacific coast, and there is a wide difference 

 in appearance between the sexes. Expanse, 1.80-2.00 inches. 



Early Stages.— The caterpillar feeds upon Amorpha calif or- 

 nica. The life-history has been accurately described, and the va- 

 rious stages depicted, by Edwards. 



(2) Meganostoma caesonia, Stoll, Plate XXXVI, Fig. 3, S ; 

 Fig. 4, ? (The Southern Dog-face). 



Butterfly. — The sexes are much alike in this species, which 

 ranges widely over the Southern States, and is found even in south- 

 ern Illinois and sometimes still farther north. Expanse, 2.25 inches. 



Early Stages. — These have been fully described by various 

 authors, most carefully by Edwards. 



Genus COLIAS, Fabricius 

 (The Sulphurs) 



" Above the arching jimson-weeds flare twos 

 And twos of sallow-yellow butterflies, 

 Like blooms of lorn primroses blowing loose, 

 When autumn winds arise." 



James Whitcomb Riley. 



Butterfly. — Medium-sized butterflies, yellow or orange in 

 color, with black borders upon the wings. In many species this 

 border is heavier in the female than in the male. 



Egg. — The egg is spindle-shaped, thickest at the middle, taper- 

 ing at the apex and at the base, generally attached by an enlarged 

 disk-like expansion to the point on which it is 

 laid. The upper extremity is rounded ; the sides 

 are marked by small vertical ridges, between 

 which are delicate cross-lines. 



Caterpillar. — The caterpillars strongly re- 

 semble in appearance those of the preceding 

 genus, from which, superficially, they cannot 

 be distinguished by any anatomical peculiar- 

 ities. They feed upon Legnminosce, and espe- 

 cially upon clover (Trifo/ium). 



Chrysalis. — The chrysalids do not generally 

 differ in appearance from the chrysalids of the 

 genus Meganostoma, though the wing-cases do 



289 



Fig. 147. — Neu- 

 ration of the genus 

 Colias. 



