238 THE CANADIAN ENTOMOLOGIST. 



by their usually greater size." It is admitted then that the species is 

 probably single-brooded in the southern part of its range, i. e., in the 

 Catskills. It strikes me as very singular that Arthemis should be single- 

 brooded to the southward, but double to the northward — and not so very 

 far north, either, the Catskills being from i° to 2° only south of the White 

 Mts., — exactly the reverse of what happens with every other species of 

 butterfly. 



On reading the paper spoken of, I wrote the author thus : " Do you 

 know of any one who has raised a caterpillar of A?i/iemis from egg to 

 chrysalis and imago the same season? Did you ever do it yourself?" To 

 this the reply came : " I have bred Arthemis only from the wintering 

 caterpillars, and I know of no one who has bred them from the egg in 

 N. Hampshire, but yoii cannot get away from a fresh September brood, 

 which I have on the authority of three or four persons, indeed myself" 



Let us look into this matter of " a fresh September brood." I will 

 first relate briefly the experience of Mr. Mead and myself with Arthemis 

 and its co-form Proserpina, and so far as I know, we, with Mr. C. H. 

 Roberts, formerly of Factory Point, Vt, are the only persons who are 

 recorded to have bred Arthemis from the egg. In Can. Ent., vii., p. 162, 

 Mr. Mead states, that in July, 1875, he had 15 females of Arthemis and 

 one female of Proserpina confined in boxes with growing branches of 

 willow, at Hunter, N. Y., in the Catskills. That the Arthemis laid about 

 500 eggs and the Proserpina 35. I myself came to Hunter just at this 

 time, arriving 25th July, and Mr. Mead gave me many larvae from these 

 eggs, and I brought them to Coalburgh while they were in their 2nd and 

 3rd stages, i. e., after ist and 2nd moults, reaching home 17th August. 

 These larvte all went into cases, the last one on 20th August, not one 

 going on to chrysalis. On 25th Aug., I received from Mr. Mead, who 

 was still at Hunter, more larvae in first stage, i. e., just out of egg, and 

 these were making their cases 9th Sept., or three weeks later than the first 

 lot. That represents the difference, or part of it, between the time of the 

 emerging from chrysalis of the earlier and later butterflies of the same 

 generation. There is a similar difference in the emerging of all species 

 of butterflies, as every lepidopterist knows. All of these larvae, though 

 from eggs laid by different females, and during three weeks, behaved in 

 the same way, all going into lethargy, and none to chrysalis. Mr. Mead 

 had taken part of the brood to New York City and some to Ithaca, N. Y., 

 and none went to chrysalis. 



