372 Explanation of Plates. 
one of the four lightest larvae on October 6th when it 
was painted. It was not among the four lightest larvae 
on September 21st, but changes took place after this date. 
Fic. 6 Larva at the same period and exposed to the same en- 
vironment as that shownin Fig. 4. The figure represents 
one of the four hghtest larvae separated 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 
larve. 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 larve of this series [1 on September 21st, 
was 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 larvee 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 apples 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 represented 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 larvee 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 
