THE CANADIAN ENTOMOLOGIST. 239 



The next year, 1876, I was at Hunter from 19th Aug. to about loth 

 Oct. During the early part of this period a few Artheiitis were on the 

 wing, but they were exceedingly rare, though in July the species abounds. 

 Mr. Mead has stated that in July, 1875, he did take 200 examples and 

 might have taken 1,000. But this great flight was over when I reached 

 the mountains, and only here and there was a single individual to be seen. 

 I was out every day searching for them in order to obtain eggs. All our 

 larvae of 1875, excepting a small number, had died during the winter, and 

 of these, three or four only reached chrysalis and imago in the spring of 

 1876, giving the form Arthemis. I was therefore anxious to repeat the 

 experiment, with the hope of determining the relation of Proserpina, 

 and I travelled far and wide to get females of one or both forms. 

 With this result : on 21st Aug., I took 3 Artlmnis % ; on 22nd, i 

 Arthemis ^ , i Proserpina $ ; on 24th, 2 Arthemis ^ , i Proserpina ^^ ; on 

 26th, I Arthemis ^ ; ist Sept., i Aj-themis $ . In all 9 butterflies, 7^,2 

 ^ . On 28th, I had ridden several miles among the hills, and found many 

 Arg. Atlantis and other species, but I saw, but failed to take, only one 

 Arthemis, a ^ , that day. Seven of the nine spoken of were taken in 

 Stoney Clove, the coldest spot in these mountains, and the very one at 

 which cool weather during early summer would retard the emerging of the 

 butterflies. 



It is plain that there is no " September brood " of Arthemis in the 

 Catskills. 



Of these females, all of which were shut up for eggs, one only laid, 

 viz., Proserpina of 22nd Aug. I had kept her alive on sugar and apple, 

 and the weather was so cold that during some days and most of the nights, 

 I had to bring her into the house; but ist Sept., she laid 11 eggs and 

 died. The other females had meantime died, and on dissection were 

 always found to contain a few nearly matured eggs, perhaps the remains 

 of a large original stock. Though observations on other species of butter- 

 flies have led me to suspect that the latest females of a generation may 

 develop but a very few eggs, and that these in the absence of males may 

 generally prove sterile. 



The larvae from my Proserpina eggs hatched from loth to 12th Sept., 

 or in from 9 to 11 days. They began to reach ist moult i8th Sept., and 

 were all past 2nd moult 24th Sept. By 30th Sept., all were in their cases. 

 As I stated in But. N. iV., I should not have raised one of these larv^ to 

 case had I not protected them in a warm room, and carefully preserved 



