SUPPLEMENT. 



While the present compilation of the published North American 

 doptera has been passing through the press, additional species have been 

 announced by authors, and others have been detected that had been pre- 

 viously overlooked ; some important rectifications of synonymy have also 

 been found necessary. With the view, therefore, of making the work as 

 complete as I can, to the end of the year 1861, I propose to combine in a 

 Supplement everything I can find bearing on the subject, not already pre- 

 sented in the preceding pages. This will include some species belonging 

 to families elaborated by Dr. Clemens, and which he has omitted from 

 their not having come under his observation, or from his not being satis- 

 fied with their exact position in the system. J. G. M. 



FAM. II. PIERIDAE, p. 15. 



By S. H. SCUDDER (in Proc. Boston Soc. Nat. nisi. VIII, 18G1, 178). 



PIERIS SCHR., p. 16. 



P. oleracea Boisd. (p. 19 of the present work). Pontia casta Kirby, F. 

 Bor. Am. IV, 288, pi. 3, fig. 1 (p. 19). Pontia oleracea Harris, N. 

 Eng. Farmer, VIII, 402, Ibid. Ins. Inj. Veg., 1st ed. 213 ; 2d ed. 23?, 

 Ibid. Agass. L. Sup. 386, pi. 7, fig. 1. Pieris crucifcrarum Boisd. Spec. 

 Gen. 519. 



The butterflies described by Harris, Boisduval, and Kirby, under 

 the above-mentioned names, are one and the same insect. It is 

 found inhabiting the northern and eastern portions of North Ame- 

 rica, reaching south but rarely as far as Pennsylvania, and extend- 

 ing to the east to Nova Scotia, west at least as far as Lake Supe- 

 rior, while to the North it is found up to Great Slave Lake, in the 

 Hudson's Bay Company's Territory, and even according to Kirby, 

 to lat. 65 N. on McKenzie River. 



I have examined many specimens obtained by Mr. R. Kennicott 

 at different points in British America, from Lake Winnipeg to the 

 Great Slave Lake, and by Mr. Drexler upon the southeastern 



