THE CANADIAN ENTOMOLOGIST. 239 



Nebraska, and supposed it to be Arpa, and so gave Nebraska as one of 

 the localities in my Catalogue. This season I have received the species 

 from the southern shore of Lake Michigan, in Indiana, from Mr. Chas. 

 E. YVorthington ; also from Mr. J. A. Moffat, of Hamilton, Ont, who 

 says it inhabits one locality there. It would appear then to occupy a belt 

 extending from Canada to Nebraska. 



CORRESPONDENCE. 

 Dear Sir, — 



Mr. A. H. Mundt, of Fairburg, Ills., writes me thus : " On 7th Sept., 

 while walking through a grove near this place, I saw a large number of 

 I). Archippus hovering about and settling upon some limbs of a hickory. 

 More from curiosity than anything else, I went again the next day before 

 sunset, and found the butterflies in still larger numbers on two branches 

 of the tree. (The weather had been pretty cold for several days, with 

 slight frost at night.) Those sitting within reach of my net seemed to be 

 alarmed and would fly upon approach, but would alight again. I resolved 

 to make a further test, and after dark I started for the grove with a long 

 step-ladder, a lantern and box, and took 125 specimens, 51 ^,74 $, all 

 of them perfect." If such assemblages of these- butterflies are usual, they 

 have so far escaped notice, and the object of them is matter for con- 

 jecture. W. H. Edwards. 



Coalburgh, W. Va., Oct. 20, 1879. 



Dear Sir,— 



In the June number of the Can. Ent., W. E. Saunders remarks that 

 he saw a specimen of Papilio thoas on the nth May, and that "the 

 appearance of this butterfly at so early a date would seem to indicate that 

 they are double-brooded here, unless it can be shown that the escape of 

 the imago from some of the chrysalids is much earlier than from others.'' 

 I have obtained two fine specimens of this butterfly from mature larvae ; 

 one in 1878, the other this year. The first example went into chrysalis 

 about the middle of September, and the imago appeared on the 9th cf 

 May following. The second was in chrysalis only from the 7th September 

 to the 23rd of March. I think the temperature at which the chrysalids 



