350 Professor E. B. Poulton on colour-relation 
April 10th. Re-fed. Three larvee unchanged. One brown 
and 1 blackish-brown larva had changed skin and become 
blackish-grey with large white patches. 
April 16th. Re-fed. The two largest larvee last described 
removed to another cylinder, L!. The three others un- 
changed. One of two smaller brown larvze appeared 
unhealthy. 
April 20th. Re-fed. One larva had changed skin and 
grown much. Of the others, neither of which had changed 
skin, one was dead and one appeared to be dying. 
April 23rd. The single healthy larva was brownish-black 
with white marks. 
April 27th. The small larva was dead. The appearance 
of the other unchanged, as also on May 8rd and 11th, when 
it was again re-fed. On May 17th the larva had died. 
lal 
The two larvae separated from L on April 16th were 
re-fed and examined on April 21st, 23rd, and 27th, the 
appearance remaining the same throughout, viz. dark 
grey with large white patches. On May ‘Brd the larger of 
the two larvae looked sickly ; on May 5th it was dead and 
the smaller one seemed unhealthy. The latter died on 
May 7th. 
M 
April 7th. Re-fed. Five larve alive, all greyish-brown. 
One of two unhealthy-looking larva had died. 
April 10th. Re-fed. Four larve unchanged; the fifth 
had changed skin and had developed larger white patches. 
April 16th. The 2 largest larvee were now separated 
and placed im another cylinder, M’. The remaining 3 
were brownish-grey, 2 of them with pale patches. The 
smallest was browner than the others and appeared to be 
unhealthy. 
April 21st. Re-fed. The last-mentioned larva was dead ; 
the others unchanged in appearance although one had 
changed skin during the interval. 
April 23rd. Re-fed. Unchanged. 
April 27th. Re-fed. One larva had become darker, viz. 
blackish-grey with white patches. The larvae were re-fed 
and compared on May 8rd, 11th, and 17th, without change 
in appearance. 
May 22nd. Re-fed. The brownish-grey larva had died, 
the darker one unchanged. 
