250 LEPIDOPTERA. 



It is pale whitish straw yellow throughout, with thick, black 

 dots on the anterior half of the body. It is .70 of an inch in 

 length. It also occurs in California. 



The Sulphur-yellow butterflies, Colias, of which C. Philodice 

 Godart, our most common butterfly, is a type, occur eveiy where. 

 There are two broods, one appearing in April and May, and the 

 other in July. Mr. Saunders gives me the following history 

 of this butterfly : "The female deposited her eggs on the 24th 

 of July ; the}' were very long, tapering at each end, with twelve 

 or fourteen raised, longitudinal ribs, and smaller cross lines in 

 the concave spaces between them. They hatched on the 31st. 

 The freshly hatched larva is about a thirteenth of an inch long ; 

 the head is black, and the body dull yellowish brown. When 

 five-eighths of an inch long, it is nearly the same as \\Jien ma- 

 ture ; the head being dark green and slightly downy, with 

 minute hairs, which also give a downy appearance to the whole 

 body, Avhich is also dotted minutely with paler points. There 

 is a yellowish white stripe, on each side close to the under sur- 

 face. Beneath, the body is slightly paler than above. The full 

 grown larva is an inch long, and differs from the young in hav- 

 ing an irregular streak of bright red running through the 

 whitish lateral line. It feeds on the clover and lupine, and on 

 the cultivated pea. It is not unlike a saw-fly larva in its ap- 

 pearance and movements, feeding on the upper surface of the 

 leaves and twisting its body into a coil when disturbed. The 

 chrysalis is about seven lines long, girt with a silken thread 

 across the greatest diameter of the bocly, which is full and bulg- 

 ing on the sides. The head is pointed conically, with a purplish 

 red line on each side, running to the tip and margined behind 

 with yellow. The body is pale green, with a yellowish tinge, 

 and a ventral line of a darker shade formed by a succession of 

 minute, yellowish dots ; a yellow stripe runs along the side on 

 the five hinder segments. Beneath, on the seventh, eighth and 

 ninth rings, is a blackish brown line on each side, deepening 

 in color about the middle of each segment, and a dorsal line 

 of dark green about the same length. It remains in the chiys- 

 alis state about ten days." 



Mr. Scudder has described three species of this genus from 

 the north. C. Labradorensis we have taken abundantly in 



