32 U. Ss. P. R. R. EXP. AND SURVEYS—-ZOOLOGY—GENERAL REPORT. 
List of specimens. 
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ARCHIBUTEO, Brehm. 
Archibuteo, Brehm, Ists, 1828, p. 1269. 
Tarsi densely feathered to the toes, but more or less naked behind and then covered with scales. Wings long and wide; toes 
short ; claws moderate ; tail rather short, wide. Other characters very similar to those of Buteo. 
This genus contains six or seven species, inhabiting Europe, Asia, and North America, all 
birds of heavy, though robust, organization, subsisting mainly on small quadrupeds and 
reptiles. The species of this genus are easily recognized by their having the tarsi feathered. 
ARCHIBUTEO LAGOPUS, Gmelin. 
Rough-legged Hawk. 
Falco lagopus, Gu. Syst. Nat. I, p. 260, (1788 ) 
Falco plumipes, Davoin, Traite d’Orn. II, p. 163. 
Falco pennatus, Cuvier, Reg. An. I, p. 323, (1817.) 
Archibuteo alliceps, BReum, Vog Deutsch. I, p. 40. 
Archibuteo planiceps, Breum, Vog. Deutsch. I, p. 40. 
Ficures.—Naumann, Vég. Deutsch. I, pl. 34, (adult and young.) Brehm, Vég. Deutsch. pl. IV, fig. 2, (adult.) Reichenbach, 
Deutschland’s Fauna, Birds, pl. XIII, fig. 51, (adult.) Korner, Skandinaviska Foglar, pl. V, fig. 15, (adult.) Gould, B. of Eur. 
I, pl. 15, (young.) Selby Ill. pl. VII, (young.) Wilson, Am. Orn. IV, pl. XXXII, fig. 1, (young.) Aud. B. of Am. pl. 422, 
fig. 2, (adult?) 
Tarsus densely feathered in front to the toes, naked behind ; wing long; tail rather short. 
Adult.—Head above yellowish white, with longitudinal stripes of brown tinged with reddish, especially on the occiput. Back, 
scapular, and shorter quills pale cinereous, with partially concealed transverse bands of white and dark brown, the latter 
frequently predominating and giving the color on the back ; rump dark umber brown; longer quills, and wing coverts umber 
brown; primaries edged externally with ashy, and with a large space on their inner webs at their base, white, with a silky lustre. 
Under parts white ; throat with longitudinal stripes of dark brown; breast with large spots and concealed stripes of reddish 
brown ; abdomen, with numerous transverse narrow bands of brownish black, most conspicuous on the flanks and tinged with 
ashy ; tibie and tarsi barred transversely with white and dark brown, and tinged with reddish ; under tail coverts white. 
Upper tail coverts white at base and tipped with brownish black ; tail white at base, with a wide subterminal band of black and 
about two other bands of black alternating with others of light cinereous. Cere and toes yellow. Under wing coverts white 
with spots of brownish black, and on the longer coverts with a large space of ashy brown. ; 
Young.—Upper parts light umber brown, many feathers, especially on the head and neck behind, edged with yellowish white 
and pale reddish. A wide transverse band or belt on the abdomen brownish black ; other under parts yellowish white, with a 
few longitudinal lines and spots of brownish black. Quills ashy brown, with a large basal portion of their inner webs white ; 
tail at its base white, with a subterminal band of light umber brown, tip white ; tibie and tarsi pale reddish yellow, with longi- 
tudinal stripes and spots of dark brown. 
Total length, female, 21 to 23 inches; wing, 16 to 17 inches; tail, 9 inches. Male, total length, 19 to 21 inches; wing, 15 
to 16 inches ; tail, 8 to 83 inzhes. 
Hab.—All of temperate North America and Europe. Spec. in Mus. Acad., Philadelphia, and Nat. Mus Washington. 
