222 Lilian J. Gould's experiments 



begun to be apparent in three of the larvae ; the other 

 three were not as yet affected by the colour of the sticks, 

 although these three rested on them as constantly as did 

 the darker larvae. 



July 12th. — Two larvae died. The larvae had seemed 

 healthy up to this time, but now began to die off, just as 

 those in cylinder 7 did. One of the two which died was 

 light-coloured, the other dark. 



July 13th. — The four larva3 left moulted for the third 

 time. 



July 22nd. — A third larvae died, and another was 

 looking very sickly. The dead larva was a light one. 



July 23rd. — The fourth ecdysis occurred. Of the 

 three remaining larvae, one was very dark brown, and 

 two much lighter. 



July 29th. — The dark larva died, and the last two 

 larvae pupated between leaves. All these six larvae were 

 darker than any with green or white surroundings, but 

 the general ground colour was not so dark as the darkest 

 in cylinder 7, though the dorsal lines in the dark indi- 

 viduals were nearly as dark as those of the darkest 

 specimen in 7. None of these larvae were figured. The 

 head and dorsal humps were as those in 7. 



Total results of the foregoing experiment : — 



Colour. No. of larv£e. 



Darkish brown (dorsal lines dark) 1 



Lighter brown (dorsal lines dark) 2 



Very light brown (dorsal lines very faint) ... 3 



Total 6 



The larva ivith green surroundings. 



Cylinder 3. — June 27th. — I placed six larvae in the 

 second stage in cylinders. The second ecdysis occurred 

 the same day. The larva3 up to now had been uniform 

 dusky brown. Two began to become lighter in colour. 



June 30th. — Three larvae were of a light clear brown ; 

 markings light. Tln-ee were rather darker. Heads and 

 dorsal humps as before. 



July 4th. — The third ecdysis took place. One larva 

 very light indeed, two nearly as light, two dark brown 

 with dorsal lines indistinct, one dark brown, with dark 

 distinct dorsal lines. 



July 13th. — The fourth ecdysis occurred. 



