A coal black species about 22 inches in length, distinguished by the white tip, and broad white band across the tail about midway. This is one of the least abundant of the Mexican species that cross the border. They are shy birds and build their nests in the tallest trees in remote woods. Their two or three eggs are grayish white, faintly spotted with pale brown; size 2.25 × 1.80. Data.--Los Angeles County, Cal., April 6, 1889. Nest of sticks, lined with bark and leaves; 45 feet up in a sycamore tree. Collector, R. B. Chapman. [Illustration 215: Grayish white.] [Illustration: American Rough-legged Hawk.] [Illustration: Grayish white.] [Illustration: right hand margin.] Page 214 346. MEXICAN GOSHAWK. _Asturina plagiata._ Range.--Mexico, north to the border of the United States. A beautiful, medium sized Hawk (17 inches long), slaty gray above, white below, numerously barred with grayish; tail black, crossed by several white bars. These are graceful and active birds, feeding largely upon small rodents, and occasionally small birds. They nest in the top of tall trees, laying two or three greenish white, unmarked eggs; size 1.95 x 1.60. Data.--Santa Cruz River, Arizona, June 3, 1902. Nest in the fork of a mesquite tree about forty feet from the ground; made of large sticks, lined with smaller ones and leaves. Three eggs. Collector, O. W. Howard. 347a. ROUGH-LEGGED HAWK. _Archibuteo lagopus sancti-johannis._ Range.--Northern North America, breeding chiefly north of our borders and wintering south to the middle portions of the United States. The Rough-legs are large, heavily built birds of prey, specially characterized by the completely feathered legs. The present species is 22 inches long, and in the normal plumage has a whitish head, neck, breast and tail, the former being streaked and the latter barred with blackish; the remainder of the upper and underparts are blackish brown. Their nests are usually placed in trees, and less often on the ground than those of the next species. These Rough-legs are very irregularly distributed, and are nowhere as common as the next. While the greater number nest north of the United States, it is very probable that a great many nest on the higher ranges within our borders. The species is often taken in summer, even in Massachusetts. They lay three eggs of a bluish white color, boldly splashed with dark brown; size 2.25 x 1.75. [Illustration 216: White.] [Illustration: Rough-legged Hawk.] [Illustration: Bluish white.] [Illustration: left hand margin.] Page 215 348. FERRUGINOUS ROUGH-LEG. _Archibuteo ferrugineus._ Range.--North America, west of the Mississippi, breeding from the latitude of Colorado north to the Saskatchewan region.