340 Professor E. B. Poulton on colour-rdation 



its skin probably since hybernation : the old skin was 

 found in the muslin bag. 



B. The 5 darkest larvm ivith lichcn-covcred sticks. — All 

 the larvae were in the same healthy and vigorous condition 

 as those just described, and had eaten the buds of the 

 hawthorn. Ev^ery trace of the winter torpor had dis- 

 appeared, and they moved freely when touched. The 

 larvse were uniformly dark brown, and quite unaffected by 

 the presence of the lichen. Four were resting on a branch 

 of the hawthorn, while one was on the muslin. 



C. The 6 darJv larv<v vjifh hlacJc tioigs. — Three were dead 

 and dried up, 2 in the bag and 1 still fixed to a branch of 

 the hawthorn. Of the living larvse, 2 were fixed to the 

 muslin and 1 to a branch. One larva appeared to be 

 unhealthy. One had changed its skin, and the hawthorn- 

 buds had been eaten. All the larvas, including the dead 

 cues, were uniformly dark. 



It was clear from this comparison that no change had 

 been wrought by the winter surroundings. 



II. THE 12 QUERCIFOLIA LARV^ WITH LICHEN-COVERED 

 STICKS BEFORE HYBERNATION. 



D. The 4 dark, vjhitc-marked larviB, including the darkest 

 of the 12, with lichen-covered sticks. — These larvae had 

 evidently eaten, and were healthy and easily disturbed. 

 Three were on branches of the hawthorn, and 1 on a 

 lichen-covered stick, but all liad left their silken foot-holds. 

 All retained the appearance they possessed before hyberna- 

 tion : the contrast between dark ground-colour and light 

 markings was weakest in the larva on the lichen-covered 

 stick. 



E. The 3 dark, tvhitc-marked larv/u, including the darkest 

 hut 1 of the 12, with black ttvigs. — All 8 larvas were on the 

 hawthorn branch, and were in the same condition as the 

 above-described set (D). One was resting on a silken 

 foot-hold, but this was probably accidental, as there was 

 no trace of torpidity. All possessed the lichen-like 

 appearance borne before hybernation. 



F. One of the 3 lightest larvae, with lichcn-corcrcd sticks. — 

 The larva was resting on the muslin. It was doubtful 

 whether anything had been eaten, but the larva readily 

 moved on disturbance, and was not resting upon a foot-hold. 

 It still remained one of the three lightest larvas, and had 

 not undergone any change during hybernation. 



