54 THE CANADIAN ENTOMOLOGIST. 



On the 20tli of July, one of them began to change color, growing darker ; 

 on the 21st it became very dark, and on the morning of the 22nd the young 

 larva was hatched. -The second egg was then deepening in color and pro- 

 duced the larva on the 23rd. The remaining egg was unproductive and 

 after a time began to shrivel up. 



Appearance of larva fresh from the egg. — Length one tenth of an inch. 

 Head large, bilobed, black. Body black, roughened with small brownish 

 black tubercles — second segment* elevated or thickened and of a dull glossy 

 flesh color, with a prominent fleshy tubercle on each side, a patch of white 

 on seventh and eighth segments, wide anteriorly, pointed behind. A dull 

 flesh colored dorsal streak on fourth and eleventh segments.' Twelfth seg- 

 ment with a pair of fleshy tubercles, rather prominent, but not so large as 

 those on second. Both those on second and twelfth have several short 

 whitish hairs proceeding from them. Under surface brownish black, feet and 

 prolegs of the same color. 



These larvae I failed to rear. Having no trees of the wild cherry within 

 a convenient distance, I thought they might be fed with leaves from a culti- 

 vated-variety, on which specimens taken nearly full grown had been previously 

 fed. It appeared however that the leaves were much tougher than those of 

 the native species, so much so that the infantile jaws of these diminutive 

 larvae failed to make any impression on them, and before the mistake was 

 discovered and the proper food supplied, they were weakened past recovery 

 and died. 



Colias pMlodice. — A female was captured on the 18th of July and placed 

 in a large sized pill box. The box was examined every day until the 23rd 

 and up to that date no eggs were deposited. It was not looked into again 

 until the morning of the 26th, when five eggs were observed sticking to the 

 sides of the box, and the parent dead. From the stiffness of the body of 

 the dead insect, I thought that they were probably deposited on the 24th, 



f The eggs were about one twenty-third of an inch long, much elongated, 

 tapering at each end, with twelve or fourteen raised longitudinal ribs, with 

 smaller cross lines in the concave spaces between them. The cross lines were 

 not always regular, sometimes so, at other times two or three in a row were 

 placed somewhat diagonally. Color when first deposited, pale lemon yellow, 

 changing in three or four days to a pale red, then gradually to hriglit red, and 

 from that to dark brown, just before the larva made its appearance. Four of 

 the eggs hatched on the 30th and the remaining one on the 31st. 



* In these, descriptions th.e head is regarded as the first segment, making the total number tliirteen. 



t Some of the descriptions following have already aiipeared in Dr. Packard's book — "A Guide to the 

 Study of Insects"— but for several reasons it has been thought desirable to publish the whole of the 

 information gained by these experiments in an aggregate form. 



