1877.] 135 [Bendire. 



found six in a nest on two occasions. They vary considerably in 

 shape and size. 



113. Nisns fuscus (Gmel.). Sharp-shinned Hawk. 

 Rather rare at all seasons. 



114. Nisus cooperi (Bonap.). Cooper's Hawk. 



Also rare, and seldom seen. I have found this species breeding 

 about Fort Lapwai, Idaho, and near Tucson, A. T. 



115. Astur palumbarius var. atricapillus (Wilson). Gos- 

 hawk. 



Not common, a few pairs breed in the mountains north of Camp 

 Harney. I have taken its eggs both here and' near Fort Lapwai, 

 Idaho. An occasional set of their eggs are faintly spotted with pale 

 reddish brown, sparingly distributed about the larger end of the egg. 

 Number of eggs usually two. 



116. Buteo swainsoni (Bonap.). Swainson's Hawk. 



A common summer resident, generally distributed throughout this 

 country, breeding in the willows along the streams, and in isolated 

 juniper and pine trees on the edge of the forests. The usual number 

 of eggs in twenty-five nests has been two, rarely three. The eggs 

 vary greatly in coloration, while their size is pretty uniform, as well 

 as their shape. Their average size is about 2.25 X 1-75 of an inch. 

 The ground color is pale greenish white marked with well defined 

 spots and blotches of a dark and light brown. Some are sparingly 

 spotted, and the spots more distinct than in others. An occasional 

 set is unspotted. 



117. Buteo borealis var. ealurus (Cassin). Western Red- 

 tailed Hawk. 



Moderately common resident, and one of the earliest hawks to 

 breed. It generally constructs its nests in large pines near the edge 

 of the forests, and a few breed in the largest willows on Silvies River 

 near the different heronries located on this stream. In a number of 

 nests from different localities I have found but two eggs, seldom three, 

 and in only one instance four. These vary greatly in color and size; 

 the average size of a number in my collection is 2.42 X 1.77 of an 

 inch. Some of these are very heavily marked with different shades 

 of brown, others are nearly unspotted. 



118. Archibuteo ferrugineus (Licht). Squirrel Hawk. 

 Rather rare, but more common in the open country to the south- 

 ward, particularly so near Camp McDermitt, Nev., where it breeds. 



