hetween lepidoftet'ous iarvie mid their surrotcndings. 827 



XIII, XIV, as well as Va in the first series of experiments), 

 they were tied together in pairs with the lichen-covered 

 surfaces outwards. 



Experiments XVI, XVII, and XVIII with the Larv^ 



OF O. bidentata upon Green Leaves and Shoots 



OF THE Food-plant {Poimlus nigra). 



The results of these experiments were uniform, and 

 require so little description that a tabular form of 

 presentation is unnecessary. 



Experiments XVI (10 young larvse), XVII (17 larvse), 

 and XVIII (14 larvee) were begun by Mr. Holland on August 

 8rd, 1898. He recorded that the larvae of XVI were pale 

 brown, 2 of them rather variegated ; while of XVII, 14 

 were pale brown and 3 rather variegated. Of XVIII no 

 record was made. The larvas were the last hatched from 

 the mixed batch of eggs which supplied the material for 

 Experiments X to XV. 



August 8th. All re-fed. Sixteen larvaii in XVII. 



Attgust 12th. XVI and XVIII re-fed ; the latter noted 

 as nearly all pale brown, a few rather variegated. 



Attgttst loth and \Wi. XVI and XVIII re-fed ; larvae 

 10 and 14 respectively. 



August 17th. XVt I re-fed ; 16 larvae. 



August 21st. XVII re-fed ; 8 larvae had escaped. The 

 10 larvae in XVI were all of a pale brown colour. 



August 22nd. XVIII, 13 larvae pale brown, 1 darker 

 with a few green markings. 



August 2Qth and 31s;;. All re-fed ; larvi^ 10, 8, and 14 

 respectively. 



Sejjtemhcr Mh. XVI, becoming mature (2 still feeding 

 on 9th and 13th ; no further notes on this set). XVII, 7 

 larvae, all pale brown. XVIII, 14 larva?, 



September 8th. XVII, 2 mature (all mature on 13th). 

 XVIII, 1 mature, 1 dead. Of 12 still feeding, 10 pale 

 brown, 2 rather darker brown. Two out of the 12 slightly 

 tinged with green. 



September 12th. XVIII, 6 still feeding. On the 

 18th they were neither pupating nor feeding, and on the 

 23rd the last died. It appears possible that there was 

 a tendency towards hybernation on the part of the larvae 

 with the slowest rate of gTowth. 



