002 \! 'isconsin Academy of Sciences, Arts, and Letters. 
brown and purple. The average size of thirteen eggs from Sas¬ 
katchewan, 1ST. W. T., is 2.33x1.82. The smallest measure 
2.17x1.77; the largest, 2.46x1.85. 
Several times as the observer approached a nest, the Hawk 
was seen standing half upright on the nest, watching the in¬ 
truder. The bird always left the nest before the tree was 
reached, generally soon enough to he out of gun range. Com¬ 
monly, on leaving the nest the bird was joined by her mate and 
the two circled about at a safe distance uttering, at frequent 
intervals, their piercing, whistle-like cries of alarm. 
348. Ferruginous Rough-Leg. 
Archibuteo ferrugineus (Licht.). 
0'n Hay 5, a pair of these birds was found to have a nest 
along the bank of the Saskatchewan River near Saskatoon, Sask. 
The nest was situated in the fork of a large birch tree, at a dis¬ 
tance of forty feet from the ground. The tree stood only live or 
six feet from the water’s edge. Large sticks, pieces of drift¬ 
wood, twigs and bark were the principal materials used in the 
construction of the nest. The lining consisted of small twigs, 
strips of bark, pieces of turf, grass, and three large black feath¬ 
ers. A squirrel’s head, on the edge of the nest, gave evidence 
that the birds had not gone hungry. This nest was considerably 
larger than any nest of Krider’s Hawk observed. It measured 
forty inches outside diameter, twelve inches inside diameter, 
twenty inches outside depth, four inches inside depth. 
When the observer approached the nest, both birds flew from 
it, one of them leaving the place, the other remaining for some 
time, hying about or quietly perched in a tree close at hand, 
watching the intruder’s every move. 
The three handsome eggs which the nest held were very slight¬ 
ly incubated. Their ground color is bluish white, but they differ 
widely in marking. The first one is quite sparingly marked with 
spots, small, with the exception of two or three, of a light choco*- 
late brown. The second egg is heavily marked with large and 
small spots and, about the larger end, bold blotches of dark red¬ 
dish brown. This is the most striking and handsome egg of the 
set. The third egg is a sort, of “go-between,” of the other two. 
A great number of reddish brown spots and specks are evenly 
scattered over the whole surface. Most of them are so minute, 
