286 GEOLOGICAL SURVEY OF CANADA. 
Maple and Skull creeks, Sask. Found six nests in 1905 and one in 
1906 in natural cavities and in woodpecker’s holes. (A. C. Bent.) 
Nesting commonly at Lethbridge, Alta., in May, 1906, laying five 
or six eggs in old woodpecker’s holes. (Raie.) Medicine Hat, 
Sask.; common along the 49th parallel between Trail and Cascade, 
and westward from Midway to the Skagit and Fraser valleys. 
(Spreadborough.) 
CLI. POLYBORUS VIEILLor. 1816. 
362, Audubon Caracara. 
Polyborus chertway (Jacg.) CAB. 1848. 
The occurrence of this species on the north shore of Lake Superior, 
not far from Port Arthur, on July 18th, 1892, is reported by Mr. 
George E. Atkinson, to the Natural History Society of Ontario. 
(William Brewster in The Auk, Vol. X, 364.) 
CLIT. PANDION Savicny. 1809. 
364, American Osprey. 
Pandion haliaétus carolinensis (GMEL.) RipGw. 1870. 
A single specimen .was obtained at Godhavn, Greenland, by 
Mr. E. Whymper and sent to the museum at Copenhagen. (Arctic 
Manual.) 
This species is a common summer resident and generally distributed 
along rivers or the borders of lakes, in Newfoundland, Nova Scotia, 
Prince Edward Island, New Brunswick and Quebec. It is rarer 
in Ontario and seldom found breeding west of Toronto. Westward 
it is found under the same conditions throughout the prairie regions 
and the mountains to the Pacific coast, though neither Atkinson 
nor Criddle have found it breeding in Manitoba. Northward it 
is found in all the forest country to the edge of the Barren Grounds 
and beyond the Arctic Circle in the valley of the Mackenzie. In 
Alaska, Nelson places its breeding range beyond the Arctic Circle, 
so that it breeds almost throughout its range. 
BREEDING Notes.—About the beginning of May the osprey 
commences to build. Its nest is built near the top of a tall tree 
