EASTERN UNITED STATES. 135 



segments, sometimes black lunate spots beneath the 

 stripe. 



The mature larva is 1.2 of an inch long ; cylindrical, 

 tapering slightly from joint 7 to the anal and from joint 

 5 to the head ; the tubercles and white hairs as before. 

 Color dark green, pale on the under side ; in line with 

 the spiracles a white or creamy- white stripe, through the 

 middle of which runs a streak of crimson, broken at 

 the junction of the segments ; frequently below this 

 stripe is a series of lunate black spots. Head pale 

 green. 



The chrysalis is an inch long, of a yellowish-green 

 color, with a yellow line along each side. From the 

 time that the egg is deposited to the emergence of the 

 butterfly from the chrysalis is about forty days during 

 the warm part of the year, and the number of broods 

 will vary according to the locality. This is not usually 

 considered a very injurious insect, but Professor C H. 

 Fernald, of Orono, Maine, estimates that these cater- 

 pillars often destroy as much as twenty-five per cent, of 

 the entire clover-crop. Their numerous parasites and 

 other enemies serve in a great measure to keep them in 

 check. 



Atlantic States to the Mississippi Valley. 



26. Colias Interior, Scud. 



Expanse of wings 2.25 inches. 



Professor Fernald says that the males of this species 

 closely resemble those of C. Philodice, except that the 

 submarginal row of dots on the under side of the wings 

 is entirely wanting in both sexes, and the terminal black 

 band of the fore wings does not reach the hind margin, 



