352 Professor E. B. Poulton on colour-relation 
EK. The three similar larve, with black twigs—These also 
were practically unchanged and lke D. One of these 
was now the blackest larva, but the smallest in D was 
almost exactly the same. It is possible that some very 
slight effect was produced by these black twigs before 
hybernation, 
F. One of the three lightest larve with lichen-covered sticks, 
—The larva was quite unchanged. 
G. Two of the three lightest larve with black twigs.—No 
effect had been produced by the black surroundings. The 
bluish-grey larva remained very distinct. 
H. Zwe larve with lichen-covered sticks—The brownish 
larva had died. The other still remained the darkest 
individual of the lighter part of the group (F, G, H) as 
it was when the ar rangements for hybernation were made. 
Comparing these two important groups I and II as a 
whole, it was seen that the lightest larva of I (m A) was 
almost precisely similar to the darkest of IL (in EK) :—in 
fact they could not have been distinguished as regards the 
size of the light patches. On the other hand, the larva in 
T was healthy and of the average size, while that in II 
was rather small. The smallest in D was not considered in 
this comparison, as it had grown but little and was a stage 
behind the others. Its light patches, although very dull 
and grey, were almost exactly the same size as those of the 
darkest larva in D, The remaining nine larve in II were 
all large and healthy, and much lighter than the lightest 
larva in I, 
III. THE QUERCIFOLIA LARV WITH BROWN BRAMBLE- 
STEMS BEFORE HYBERNATION. 
Comparing these as a whole with sets I and IJ it was 
obvious that the lghtest of them was distinctly darker 
than the darkest of the group just described (IT) and exposed 
to lichen before hybernation. The larva were perhaps as 
dark as those in group I, exposed to Turkish oak before 
hybernation, but they were not so black, and, except in two 
larve, the light markings were less white, beg greyish 
and clouded over. 
T, The four uniform dark larve with lichen-covered sticks. 
—Two larve were very dark with a dull blackish ground- 
