men that did not show the mixture of Mexicanus, from any part 

 of the Missouri water-shed beyond the strict limits of the Eastern 

 Province. But at the Rocky Mountains this mongrel breed runs 

 up north into the Saskatchewan region at least, if not farther. 



auratus flourishes untouched with red. I have specimens of vari- 

 ous grades of "hybridity" from the mountains where the St. 

 Mary's, the Kootenay (or Kootanie) the Belly and other tributa- 



Audubon's warbler (Dendrceca Auduboni) breeds in the Rocky 

 Mountains at the locality lately specified. Several very young 



not quite made out respecting the 

 lark, Neocorys^ Spraguei. The bird 



west of the Red River and north of the Missouri Coteau. I cer- 



site of Fort Union (Audubon's original locality), and thence up 

 the Missouri to the mouth of Milk River, I noticed altogether a few 

 hundred perhaps. But the birds were not common, and in all the 

 country west of this I saw none at all until I came upon the head 

 of Milk River, just at the ridge that divides these waters from those 

 of the Saskatchewan. There, among the foothills of the Rockies, 

 the species reappeared. Much tin- same peculiarity attaches to the 



the Mouse River region, and the type came from the Upper Mis- 

 single one in the whole country from the month of the Yellowstone 

 to the headwaters of the Saskatchewan.— Fort Benton, Montana, 

 Sept. 9, 1874. 



THE COLOSSAL CEPHALOPODS OF THE NORTH 

 ATLANTIC. II. 



