372 Explanation of Plates. 



one of the four lightest larvas on Octolser 6th when it 

 was painted. It was not among the four lightest larvje 

 on September 21st, but changes took place after this date. 

 Fig. 6 Larva at the same period and exposed to the same en- 

 vironment as that shown in Fig. 4. The ligure represents 

 one of the four lightest larvae sejiarated for painting on 

 September 21st, and the only one which remained of a 

 greyish tint, the others becoming brownish. It was 

 painted on October 2nd. 



7. Larva at the same period and exposed to the same en- 



vironment as that shown in Fig. 4. The figure repre- 

 sents one of the commonest types of appearance on 

 September 21st, viz. the group of six dark white-marked 

 larvae. The drawing was made on October 10th. 



8. Larva at the same period and exposed to the same 



environment as that shown in Fig. 4. Among the 

 eight darkest larva; of this series II ou September 21st, 

 Avas one in which the white markings possessed a bluish 

 tinge. This was set aside for painting. But changes 

 took place later on, and one of the other seven larvae was 

 found more nearly to represent the previous appearance 

 of the separated larva. The former, which had become 

 greyish, was therefore painted on October 9th. 



9. Larva at the same period and exposed to the same en- 



vironment as that shown in Fig. 4. The description of 

 Fig. 4 applies in every respect except that the larva here 

 represented was painted on October 7th. 



10. Larva just before hybernation, showing the effect of an 



environment of reddish-brown stems of bramble. The 

 larva rei^resented was one of the two mentioned on 

 October 16th, in which the light patches were well 

 developed and' of a brownish tint. It was painted on 

 October 13th. 



11. Larva at the same period and exposed to the same en- 



vironment as that shown in Fig. 10. The larva repre- 

 sented was the lightest of the seven very uniform dark 

 brown larvaj with lighter brown patches and small white 

 marks mentioned on October 16th. These light patches, 

 which are not very distinct in this figure and in Fig. 13, 

 were generally present on the 2nd, 5th, and 8th abdominal 

 segments. The larva was painted on September 30th. 

 12. Larva at the same period and exposed to the same en- 

 vironment as that shown in Fig. 10. The larva repre- 

 sented was the brown individual with the dorsal surface 



