252 GEOLOGICAL SURVEY OF CANADA. 
on the plains of the Saskatchewan, and at York Factory, Hudson 
bay, between lat. 53° and 57°. (Richardson.) This species is far 
outnumbered at London, Ont., by the red-shouldered hawk. More 
common in the more remote districts. (W. E. Saunders.) 
BREEDING Notes.—tThis is a rare bird along the St. Lawrence. 
In eleven years I am only certain of having seen one specimen. 
In the counties of Lanark and Renfrew it is common, and I used 
to see it every year. It breeds within a few miles of the village of 
Renfrew and sparingly near Sharbot lake. (Rev. C. J. Young.) 
The red-tail breeds in scattered pairs about one to four of the red- 
shouldered. It nests a little earlier and lays two to three eggs. 
(W.E. Saunders.) This bird breeds in Welland county and through- 
out southern Ontario. (W. Raine.) On May 31st, 1891, I took a 
nest of this near Indian Head, Sask. The nest contained three eggs 
and was built of sticks in a dead poplar (Populus tremuloides) about 
thirty feet from the ground. This species feeds chiefly on gophers 
and mice. (Spreadborough.) 
337a. Krider Hawk. 
Buteo borealis krideru HOoPEs. 1873. 
High central plains of the United States and probably adjoining 
British provinces. (Cowes.) A young bird taken near there, was 
seen in a taxidermist’s shop in Maple Creek, Sask. Bishop thought 
it was nearer calurus than krideru. (A.C. Bent.) <A careful exami- 
nation of a specimen collected at Edmonton, Alta., by Spread- 
borough shows it to be this form, and his notes on the breeding 
of the red-tailed hawk at Edmonton which were given under borealts 
in the first edition of this catalogue are now placed under krideri. 
It is more than probable that many of the prairie references given 
under borealis should go here. 
BREEDING NotTEes.—At Edmonton, on the North Saskatchewan, 
in 1897, I observed a number of nests mostly along the river and 
small streams. These were nearly always in cottonwood trees 
(Populus balsamifera) but I think it is on account of these trees 
having large branches near the top that they seem to prefer them 
than from any other cause, as I also observed a few in poplar trees 
(Populus tremuloides) where the branches were suitable for them 
