LIFE-HISTORY OF COLIAS HYALE. 7 



C. liyale hybernate ? So far, I think it certainly may be said that 

 it hybernates in the larval condition. 



Firstly, for what motive other than hybernation did all three 

 larvae at the same time carefully spin upon the surface of the 

 leaves little carpets of silk and thereon rest, which process was 

 afterwards repeated by the other five ? 



Secondly, when placed in a temperature of 73° on October 

 23rd, five days after entering hybernation, two moved off their 

 resting-places, but shortly returned and settled down as before 

 (see Entom. xxv. 374). 



Thirdly, why cannot they be induced to leave their hyber- 

 naculum ? 



Lastly, could a non-hybernating larva exist for sixty days 

 without food and remain apparently in a healthy state ? 



Balham, December, 1892. 



LIFE-HISTOEY OF COLIAS HYALE. 

 By Heebeet Williams. 



In addition to the interesting notes by Mr. F. W. Frohawk 

 on this species (Entom. xxv. 271), it may be well to record the 

 successful rearing of the perfect insect during the late autumn 

 of 1892. 



On the 19th September last, Mr. F. W. Hawes and myself, 

 whilst collecting together, had the good fortune to capture at 

 Northfieet, Kent, two female Colias liyale, which, under the 

 genial influence of the sun at North Finchley on the 20th and 

 two following days, deposited eggs freely on plants of Medicago 

 lupulina and clover ; and from my share of the resulting ova I 

 have taken the opportunity of making the following notes. 



The egg in shape is very like the seed of the garden lettuce, 

 very small in circumference at the base, and gradually increasing 

 in thickness until about two-thirds of the distance towards the 

 apex ; it then narrows off rapidly to a blunt point. The egg 

 stands erect, like those of the " whites," and has about fourteen 

 longitudinal ridges, which do not, however, meet at the top, but 

 terminate at the circumference of a small circle, the intervening 

 depressions between these ridges being most delicately reticulated 

 transversely. When first deposited, the egg is of a very pale 

 straw-colour, inclining to white, but it rapidly deepens to a 

 reddish orange, until about twenty-four hours before hatching, 

 when it changes to a bluish black. 



The first egg hatched on the 29th September, and the young 

 larva emerged from an opening in the side of the egg, leaving the 

 top intact. The colour of the newly-hatched larva is a greyish 

 green, with a black head, and is entirely without markings, 



