160 FALCONS, HAWKS, EAGLES, ETC. 



Oregon, Washington, Idaho, Nevada, and other localities in the Great 

 Basin, destroying and eating up every green thing as they move 

 along. . . . 



"I cannot recall a single instance where one of these birds visited 

 a poultry yard. . . . From an economic point of view I consider it 

 by far the most useful and beneficial of all our hawks." (Bendire.) 



During the migrations flocks of one or two hundred Sw^ainson 

 hawks are sometimes seen on the ground catching grasshoppers. 



Subgenus Buteola. 



343. Buteo platypterus (VieilL). Broad-winged Hawk. 



Adults. — Upper parts dark brown, wing quills and tail blackish, tail 

 narrowly tipped with white, and with 3 to 4 broad grayish bands ; under 

 parts from dark brown to rusty or rufous. Young : tail narrowly tipped 

 w ith white and crossed by 5 to 7 blackish bands ; sides of head and under 

 parts dull white or buffy, marked with long dark streaks, cordate spots on 

 sides, and barring on thighs. Male : length 13.25-15.00, wing 9.85-10.70, 

 tail 6.50-7.00, bill .70. Female : length 16-18, wing 11.00-11.40, tail 7-8, 

 bill .70-.80. 



Remarks. — In normal plumage the broad- winged and the Swainson sug- 

 gest each other, but differ in the much smaller size of the broad-wing, as 

 well as the white belly and thighs, and 9 or 10 tail bands of the Swainson. 



Distribution. — Breeds in eastern North America from New Brunswick 

 and Saskatchewan south — mainly east of the Mis.sissippi — to Mexico ; 

 migi'ating through Central America and the West Indies to northern South 

 America. Recorded from 101° in Texas. 



Nest. — In trees, generally not more than 25 feet frona the ground ; of 

 sticks, lined largely with strips of bark or leaves. Eggs : usually 2 or 3, 

 grayish or pale greenish, marked irregularly with lavender, pearl gray, 

 and sometimes brow n. 



Food. ^Ground squirrels, wood mice, field mice, shrews, moths, grass- 

 hoppers, crickets, and beetles. 



The eastern broad-wing has been found along wooded rivers in 

 western Texas. 



GENUS URUBITINGA. 



345. Urubitinga anthracina (Lichi.). Mexican Black Hawk. 



Tail about two thirds as long as wing, emarginate or nearly even ; 4 

 outer pi'imaries sinuate on inner webs ; primaries exceeding secondaries by 

 less than length of naked front of tarsus ; tarsus much longer than mid- 

 dle toe and claw, onlj-^ feathered for a short distance. 



Adults. — Whole bird black except for tail, w^hieh has a white base, tip, 

 and medium cross band. Young : under parts buffy, streaked with black- 

 ish ; thighs heavily barred with blackish ; upper parts blackish, streaked 

 with whitish, buffy, and rufous ; tail banded obliquely with black and 

 white. Male : length 21.50, wing 13. 15-14.90, tail 7.90-9.75, bill 1.00-1.05. 

 Female: length 20.00-22.50, wing 14.25-16.00, tail 9.2.5-11.00, bill 1.05- 

 1.10. 



Distribution. — From Arizona and the Lower Rio Grande Valley in 

 Texas sonth to northern South America. 



Nest. — Bulky, of sticks and herbage, lined with dry leaves, and placed 



