344 Professor E. B. Poulton on colour-relation 
C. Three dark quercifolia larvx (out of 6) on black twigs 
throughout. 
April 7th. Re-fed. Two larvie dead. The third at rest 
on twig; black. When re-fed on the 10th it was on twig 
and unchanged. 
April 16th. Re-fed. At rest on twig. It had changed 
skin and was black with a few whitish spots) When 
re-fed on the 21st, 23rd, 27th, and May 3rd it was un- 
changed, and on e: 1ch occasion resting on a twig. 
May 7th. Re-fed. At rest on twig ; unchanged. A 
rather darker larva from cylinder A was added. Part of 
the skin of the previous stage was adherimg to the anterior 
part. When re-fed on the 11th, 17th, 21st and 25th, 
these larvez were unchanged in appearance. Upon all 
dates except the last it was noticed that they were both 
upon twigs. Both larve were sent to Lord Walsingham 
on May 31st. 
Il. THE QUERCIFOLIA, LARVA ON LICHEN-COVERED 
STICKS BEFORE HYBERNATION. 
D, Four dark, white-marked quercifolia larve, including the 
darkest of II, on lichen-covered sticks throughout. 
April Tth. Re-fed. Four larvee, of which one appeared 
to be unhealthy. All were darkish with large white 
patches. 
April 10th. Re-fed. One larva had died, 3 upon sticks. 
Two had changed skin, 1 remaining unaltered, the other 
with a further extension of the white patches. 
April 16th. Re-fed. Two larve upon sticks, 1 upon 
hawthorn. All were dark with large white patches, and 1 
larva was very small. 
April 21st. Re-fed. The 2 larger larva on sticks, the 
small one on hawthorn. The former dark grey and pale 
ereyish-brown respectively; both with very large white 
patches. The small larva was brownish-grey with pale 
marks. When re-fed on the 23rd all were on sticks and 
unchanged, as also on the 26th, except that the small larva 
was on the hawthorn. 
May 3rd. Re-fed. The pale greyish-brown larva had 
changed skin and was now a darker blackish- brown, with 
large pale markings. The other larvee were unaltered. 
May 11th. Re-fed. Two on sticks, the third, the large 
