SATYRUS II., III. 
These lots of eggs were kept apart, and as the caterpillars hatched they were 
placed on grass in separate pots, and left in a cool room for the winter. * Some 
of the Illinois eggs, however, were sent to Mr. C. P. Whitney, of Milford, New 
Hampshire, to be placed on ice. Apparently they hatched in transit, and in 
February, I received the caterpillars in good condition after their five months’ 
sleep. Since that time, I have subjected several species of caterpillars to pro¬ 
longed cold when m their first stage, and the result has constantly been that 
they were more healthy for this treatment, and there has been very little loss 
bv disease or from want of vitality at moulting time in the subsequent stages. 
On 2od February, one of the Catskill Nephele passed its first moult, and be¬ 
fore 4th March, several of that lot had passed that moult. One Coalburgh Alope 
and one Hoboken Alope passed first moult 7th March. Two from Illinois passed 
same moult 8th March. To the end some of the Catskill larvae were in advance 
of all, and some of the Illinois lingered behind all. The stages of one Coalburgh 
Alope and one Nephele-Olympus were as follows : — 
ALOPE. 
1st moult, 7th March 
2d « 21st “ 
3d “ 14th April 
4th “ 2d May. 
Chrysalis, 26th “ 
Imago out, 9th June. 
OLYMPUS. 
1st moult, 8th March. 
2d “ 21st “ 
3d “ 9th April. 
4th “ 26th “ 
Chrysalis, 17 th May. 
Imago out, 30th May. 
Here Olympus , though later than Alope at first moult by one day, passed its 
stages more rapidly and reached imago ten days sooner, and probably this was 
one of the caterpillars which wintered on ice. I had not separated these at the 
time from the rest of the brood, but subsequent experiments have invariably 
shown that the effect of cold applied to the caterpillar is to hasten all the 
stages. 
The caterpillars of these several broods could not be distinguished from each 
other up to the third moult. After that, they were in general alike, but the Illi¬ 
nois examples showed a distinct yellow stripe on the upper part of the side, and 
on either edge of the green medio-dorsal stripe was a yellow line. The Catskill 
A ephele showed faint traces of the yellow stripe, but the Alope, at this sta^e 
none at all. ° ’ 
After fourth moult, the same peculiarities appeared, there being a distinct yel¬ 
low stripe on the Nephele-Olympus. As the stage progressed, some of the Alope, 
as well as some Catskill Nephele, developed an indistinct stripe, others not. From 
third moult to maturity, the Alope from all localities, and the Catskill Nephele, 
