A large, handsome Hawk which may be identified by its dark upper parts and white underparts and tail, the flanks and tail being lightly barred with grayish; the shoulders are chestnut. It is especially abundant in the southern parts of Texas, where it builds its nests of sticks and weeds, lined with grasses, leaves and moss. They nest in March and April, laying two, or rarely three, eggs which are a dull white, and generally immaculate, but occasionally faintly or sparingly spotted with brown. Size of eggs 2.25 × 1.80. 342. SWAINSON'S HAWK. _Buteo swainsoni._ Range.--Central and western North America, from the Mississippi Valley and Hudson Bay, to the Pacific coast, breeding throughout its range. In the greater part of its range, this is the most abundant of the Hawk family. Its plumage is extremely variable, showing all the intergradations from a uniform sooty blackish to the typical adult plumage of a grayish above, and a white below, with a large breast patch of rich chestnut. Their nesting habits are as variable as their plumage. In some localities, they nest exclusively in trees, in others indifferently upon the ground or rocky ledges. The nest is the usual Hawk structure of sticks; the eggs are white, variously splashed and spotted with reddish brown and umber. Size 2.20 × 1.70. Data.--Stark Co., N. D., May 21, 1897. Nest of sticks, lined with weeds in an ash tree. Collector, Roy Dodd. [Illustration 214: Sennett's White-tailed Hawk.] [Illustration: White.] [Illustration: Swainson's Hawk.] [Illustration: left hand margin,] Page 213 343. BROAD-WINGED HAWK. _Buteo platypterus._ Range.--North America, east of the Plains, and from the British Provinces southward. A medium sized species, about 16 inches in length, and with a short tail and broad rounded wings; adults have the underparts handsomely barred with brown. Their nests are usually built in large trees, but generally placed against the trunk in the crotch of some of the lower branches. It is made of sticks and almost invariably lined with bark. The two to four eggs are of a grayish white color, marked with chestnut, brown and stone gray; size 1.90 × 1.55. Data.--Worcester, Mass., May 16, 1895. Nest about 20 feet up in a large chestnut tree. The birds continually circled overhead, their weird cries sounding like the creaking of branches. Collector, A. J. White. 344. SHORT-TAILED HAWK. _Buteo brachyurus._ Range.--A tropical species, which occurs north to the Mexican border and regularly to southern Florida, where it breeds in the large cypress swamps. Its eggs are pale greenish white, sparingly spotted with brown, chiefly at the large end. Size 2.15 × 1.60. 345. MEXICAN BLACK HAWK. _Urubitinga anthracina._ Range.--Mexican border of the United States and southward.