190 THE CANADIAN ENTOMOLOGIST. 



apart. They were found September 9, 1883, at which time they were 

 hatching, hence the length of the egg period is not known. 



Young Larvae. — Length .06 inch. Color dull yellow, more or less 

 brownish at the ends, the sides of the head distinctly brownish. Each 

 joint bears six branching spines concolorous with the body. In outhne 

 somewhat elliptical, the head being nearly as broad as the middle of the 

 body, but the anal joint is not. Length of this period 5 days. 



After "First Moult. — Length .10 inch. Shaped much as before, oblong 

 elliptical. Color pale dull yellow, clearer than before the moult. Num- 

 ber of spines the same, about 3 branches to each. Head blackish on the 

 sides. Length of this period 6 days. 



After Second Moult. — Length .20 inch. Shape and branching spines 

 as during the last period, except there are more points to each spine than 

 before, seven counted on one. Ground color yellow, clearer than before 

 moult, eyes blackish yellow, a black spot in the lower part of each, and a 

 spot below the eyes blackish yellow. Legs, except the articulations, 

 smoky yellow. Tips of spines brown. More narrowly elongate than 

 during last period. The length of this period not known, as the food 

 plant died, mosdy from attacks of these insects. Before finding the eggs, 

 however, I had taken a description of a mature larva and pupa, as well 

 as pupal period. From what I observed then on the food plant earlier in 

 the season, I know that the principal differences that would have been 

 noted on the stages between the second moult and the mature larva were 

 those of size. 



Mature Larva. — Length from .35 to .40 inch. Elliptical in outline, 

 the width and height through the middle of the body .15 inch. Color 

 yellow, each joint with 6 branching spines which are yellow on their basal 

 half, the rest black, there being about 9 branches to each spine. Eyes 

 and ends of tarsi brownish black. 



Chrysahs. — Length .35 inch, of an outHne similar to the mature larva; 

 yellow, moderately covered with short hairs, black and white mixed. 

 Length of this period 8 days. 



Dr. Packard says of this : " The larvae, according to Osten Sacken, 

 are common on the leaves of the pumpkin. It is yellow, with long, brown, 

 branched spines, arranged in rows of six on each segment, except the 

 first thoracic segment, which has only four." I found them feeding on 

 EcJiinocystis Lobata, or the common prickly cucumber, and found not 



