THE CANADIAN ENTOMOLOGIST. 147 



retard their development somewhat. At least one egg did not hatch, 

 though the larva seemed to be fully developed inside it. As soon as I 

 found that these larvae would not feed and that they seemed to be shrink- 

 ing in size, I put them into a small pill box and the unhatched egg in 

 another and placed them along with a pill box containing larv?e of Celias 

 Interior, in a wide mouthed glass jar, with a bung to close the mouth, and 

 put it in the refrigerator. Some time afterwards I found that by some 

 means water had got into the jar and the boxes were wet and mouldy, 

 and so took them out. • The larvae were still alive, so I placed them out 

 of doors, and later, when the snow came, I put them in a box and buried 

 them under the snow. The Colias larvfe survived the winter, but these 

 did not. 



On the loth of June last I went out in the evening to St. Therese on 

 an entomological quest, and the next day I found Cybele $ on the wing. 

 Messrs. Winn and Gibb have also found it as early, and I think that this 

 early appearance in this latitude proves that these early fliers could not 

 have come from larva; which hibernated direct from the egg, but that the 

 larv* must have passed one or more moults before hibernation. Mr. 

 Edwards found the pupal period to be 22 to 24 days, in Virginia, in some 

 cases and from 16 to 20 days in others. Now, it is probable that in this 

 latitude the period would be as long as the longest in Virginia, but even 

 the shortest would carry back pupation into the month of May, and as 

 the snow often lies till late in April and the early part of May is 

 frequently cold, it would only leave four or five weeks of cool weather for 

 the full growth of this larva, which is said to be decidedly sluggish in its 

 growth, which seems to me utterly impossible. Colias I?iterior, which 

 passes one moult before hibernation, developes rapidly, and has a pupal 

 period of only about ten days ; does not attain the imago state in the 

 Adirondacks for several weeks later, though the ones reared by me in 

 confinement had their period of emergence accelerated by about three 

 weeks. 



My experiments so far have produced rather negative results, but 

 they prove that eggs are laid in July, that the resulting larvae sometimes 

 feed and grow perceptibly, and, I think also, that the species flies too 

 early in this latitude to have come from larvae which hibernated direct 

 from the egg. 



I do not like theorizing upon such insufficient data, but I am inclined 

 to the hypothesis that there are two almost distinct cycles of this species 



