230 Lilian J. Gould's experiments 



manent colour, viz., plum-colour, with a blue bloom 

 on it. 



Sept. 4th. — The last three larvae pupated among leaves 

 on the floor. 



Total results of experiment : — 



Colour. No. of larvffi. 



Bluish green 5 



Other colours ... 



Total 5 



This experiment would have been more satisfactory if 

 I could have had more material to work upon. As I 

 had only two sets of larvaB, I could not satisfy myself as 

 to whether the darkening to brown or remaining green 

 in the second stage was normal. Mr. Poulton experi- 

 mented with the same species, the results of which are 

 now to be published. 



4. Notes on larva of Mamestra brassica3. 



In June, 1891, some fertile ova of the Cabbage Moth 

 {M. hrassicce), from one parent, were sent me by Mr. 

 Poulton, for purposes of experiment in colour-relation. 



June 28th. — Thirty larvse hatched, and were placed 

 together in cylinder 1, and fed on cabbage. The colour 

 of the larv8B was uniform dusky brown ; they had blackish 

 heads. 



July 5th. — The first ecdysis occurred; the larvae 

 having been hatched the same day, moulted together, 

 with a difference of hours only. The larvae were now 

 light green, with yellowish heads. 



July 7th. — I divided the larvae (now all in the second 

 stage), placing fifteen in cylinder 2, and giving them 

 very dark brown earth as a floor. It was of no use to give 

 black sticks to this species, as they never rest on sticks ; 

 so the earth was intended to serve for dark surroundings. 

 Fourteen larvae were left in cylinder 1 ; one was lost 

 during the operation, and could not be found again. 

 Total, 29. 



The larrte ivitli dark surroundings. 



Ci/Undcr 2 — July 13th. — The second ecdysis occurred ; 

 the larvae changed to a deep green, with lighter longi- 

 tudinal markings ; heads yellow. Of the fifteen larvse, 



