362 Professor E. B. Poulton on colov/r-orlation 



stage, and of these the smallest was dark brown while the 

 other 2 were light greenish-brown. 



June 3rd. The five largest larvte were changing the 4th 

 skin, and were placed in a cylinder (B^) with black sticks. 

 Their colour was as described on June 2nd, and their 

 length 20'5 mm. The colours of the remaining 10 larvse 

 had not altered. 



Ju7u otJi. Only 9 larva? were found. Two larvae were in 

 the 5th stage and bright green. Five were more or less 

 advanced in the 4th stage, and were distinctly green with 

 a variable degree of development of brown patches. Two 

 were much smaller in the 4th stage and light greenish- 

 brown in colour. 



J2i//i€ 20th. Three larva? were large in the 6th sta^e, and 

 all very bright green with onlv a trace or no trace at all 

 of a brownish tint along the median dorsal line. The other 

 6 larvae were not noted on this date. 



June 26th. Only 8 larvte were found. Two of the 

 largest green larvae had become mature, and were removed 

 for pupation. The remaining 6 were of various sizes, but 

 all were bright green except one. 



July 2nd. One green larva was mature and was re- 

 moved. Three were in the 6th stage, 2 bright green, one of 

 them with a little bro^vn on the sides and a brown dorsal 

 line ; the 3rd was intermediate, with a brown dorsal line, 

 and green and brown patches alternating on the lateral 

 surfaces. One was changing the last skin and one in the 

 oth stage, both bright green. 



Jul}/ 12fh. One green larva mature and removed. 

 The 2 small ones were dead. Of the two remaining larvae 

 in the 6th stage 1 was bright green and 1 intermediate. 



CONCLUSIOXS. 



The only point which calls for remark is the occurrence 

 of a single intermediate larva. This was a probable 

 result of the large numbers of the young larva- in a single 

 cylinder : so that some eflfect in a specially susceptible 

 indi\ddual followed from the presence of other young 

 bro^vnish caterpillars. 



W. A. hetularia. 



May 20th. The 20 hetularia larvae changing the 2nd skin 

 transferred from green leaves and shoots to an environment 



