344 Professor E. B. Poulton on colour-rdation 



C. TliTcc dark quercifolia Im^vai {out of 6) on Uach twigs 



throughout. 



A^yril 7th. Re-fed. Two larvte dead. The third at rest 

 on twig-; black. When re-fed on the 10th it was on twig 

 and unchanged. 



April IQth. 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 each occasion resting on a twig. 



3fay 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 adhering to the anterior 

 part. When re-fed on the 11th, l7th, 21st and 25th, 

 these larvaB were unchanged in appearance. Upon all 

 dates except the last it was noticed that they were both 

 upon twigs. Both larvae were sent to Lord Walsingham 

 on May 31st. 



II. THE QUERCIFOLIA LARV.i: ON LICHEN-COVERED 

 STICKS BEFORE HYBERNATION. 



D. Four dark, white-ynarked quercifolia larvm, including the 



darkest of II, on lichen-covered sticks throtcghout. 



April 7th. Re-fed. Four larvae, 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 larvas upon sticks, 1 upon 

 hawthorn. All were dark with large white patches, and 1 

 larva was very small. 



April 'list. Re-fed. The 2 larger larvae on sticks, the 

 small one on hawthorn. The former dark grey and pale 

 greyish-brown respectively ; both with very large white 

 patches. The small larva was brownish-grey with pale 

 marks. When i-e-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 Srd. Re-fed. The pale greyish-brown larva had 

 changed skin and was now a darker blackish-brown, with 

 large pale markings. The other larvae were unaltered. 



May 11th. Re-fed. Two on sticks, the third, the large 



