854 Professor E. B. Poulton on colour-relation 



much smaller than any in II, except the small larva in 

 E and 1 in D. 



B. The 5 darkest larvse with lichen-covered sticks. — Three 

 larvse, 1 of which was changing its last skin, were black 

 chequered with white markings, which were not quite so 

 large as those of the larva in A. Two larva? were very- 

 dark and unspotted. 



C The single dark larva with black twigs was changing 

 its last skin, and was still dark. 



Hence probably no etiect had been produced by the 

 surroundings to which the larva^ had been exposed since 

 hybernation. 



II. THE QUERCIFOLIA LARV^ EXPOSED TO LICHEN- 

 COVERED STICKS BEFORE HYBERNATION. 



D. The 8 dark, white-marked larva} with lichcn-covoxd 

 sticks. — Two larvae were large in the last stage. One of them 

 became much darker after changing its last skin, but still 

 remained black with lioht markings. The effects of their 

 dark and light tints were more brownish and yellowish, 

 and on the whole darker than those of the 2 large larvae 

 in E. In fact, a comparison of D and E did not support 

 the conclusion that the larvae were sensitive to their 

 environment after hybernation. 



The small larva in D which had laffojed behind the 

 others had changed its skin and was rather lighter. It 

 was still in an earlier stage than any of the others, but 

 apparently healthy. 



E. The 3 similar larva} with Uack twigs during and 

 since hybernation. — Two larva- were large in the last stage 

 and remained black-and-white. The third larva was smaller 

 and had been injured. It was probably unable to change 

 its skin in consequence. 



F. One of the lightest larva} with lichen-covered sticks 

 tho'oughout. — This larva was in last stage, and its light 

 markings had become much darker in tint, being of a 

 yellowish-brown colour. 



G. Tvjo of the lightest larva} with blcwk twigs during and 

 since hybernatio7i. — The lighter of the 2 remained about 

 as in the previous stage ; the other, the bluish-grey larva, 

 had not yet changed its last skin, but was apparently 



