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 califor- 
nica. The life-history has been accurately described, and the va¬ 
rious stages depicted, by Edwards. 
(2) Meganostoma csesonia, Stoll, Plate XXXVI, Fig. 3, $ ; 
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) 
i{ 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 Leguminosce , and espe¬ 
cially upon clover ( Trifolium ). 
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. 
