SATYRUS II., III. 



These lots of eggs were kept apart, and as the caterpiHars 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. Apparent!}' they hatched in transit, and in 

 Febrnary, I received the caterpillars in good condition after their five months' 

 sleep. Since that time, I have sulyected several species of caterpillars to pro- 

 longed C(jld when in their lirst stage, and the result has constantly been that 

 they were more healthy for this treatment, and there has been very little loss 

 by disease or from want of vitality at moulting time in the subsequent stages. 



On 23d February, one of the Catskill Ncphele passed its first moult, and be- 

 fore 4th March, several of that lot had passed that moult. One Coalburgh Alojje 

 and one Hoboken Alo]ie passed first moult 7th March. Two from Illinois passed 

 same moult 8th March. To the end some of the Catskill larva? were in advance 

 of all, aiid some of the Illinois lingered behind all. The stages of one Coalburgh 

 Aloj^e and one Nepliele-Ohj^npus were as follows : — 



ALori;. oi.YMPUs. 



1st moult, 7th March. 1st moult, 8th March. 



2d " 21st " 2d " 21st 



3d " 14th April. 3d " 9th April. 



4th " 2d May. 4th " 2Ctli " 



Chrysalis, 2Gth " Chrysalis, 17th May. 



Imago out, 9th .June. Imago out, 30th May. 



Here Ohjmpus, though later than Alope at first moult by one day, ]:)assed its 

 stages more rapidly and reached imago ten days sooner, and pi'ohably this was 

 one of the caterpillars which wintered on ice. I had not separated tliese 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 

 stat>:es. 



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 

 Nephele showed faint traces of the yellow stripe, but the Alope, at this stage, 

 none at all. 



After fourth moult, the same peculiarities appeared, there being a distinct yel- 

 low stripe on the Nephele- 01 i/mpns. As the stage progressed, some of the Alope^ 

 as well as some Catskill Ncpheh', developed an indistinct stripe, others not. From 

 third moult to maturity, the Alope from all localities, and the Catskill Nephele, 



