12 . ZOOLOGY. 



olive lustre. Length about 16 inclies ; wing 13^. The only specimen known at present was 

 collected not far from Fort Fillmore by Dr. T. C. Henry. 



BUTEO MONTANUS, Nuttall, (p. 26.)— The Western Red-tailed Hawk. 



Buleo monlanus, Nott. Manual Orn. U. S. I, 112, (1840.) 



Adult female. — Throat and neck before dark brown mixed with white ; the brown color more extended, and, with the abdomen, 

 tibia;, and under tail coverts, much more tinged with rufous than in B. borealis. Tibiae distinctly barred transversely with rufous. 

 Size rather larger. General appearance similar to Buteo bonalis, but rather larger, and with the wiugs longer; throat and neck 

 before brown ; breast and abdomen white, with a very pale fulvous or rufous tmge ; sides with numerous narrow lanceolate and 

 oblong spots of dark brown and rufous; abdomen with a broad transverse band composed of spots of the same description. 

 Tibial feathers pale rufous, with numerous transverse bands of a darker shade of the same color. Under wing coverts pale 

 yellowish white, with brown spots. Tail above bright rufous narrowly tipped with white, with a subterminal band of black, and 

 a few indications of transverse stripes near the shafts of the feathers. TJpper parts of the body dark umber brown, with partially 

 concealed ashy white and pale fulvous spots and transverse bands, especially on the scapulars and shorter quills. Upper tail 

 coverts reddish white, with transverse bands of dark brown. Bill dark bluish ; tarsi and toes yellow. 



This species can only be distinguished from B. borealis by Its larger size, the greater extent of the dark color of the throat, 

 and the prevalence of the rufous color of the abdomen and tibiee. In some specimens, however, the abdomen is nearly pure white. 

 Another plumage of this bird, apparently adult, of both sexes, is as follows, and is the most easily recognized of any stage: 



Adult male and female. — Like the preceding, but with the under parts pale rufous, lighter on the breast, some feathers, 

 especially on the abdomen, having longitudinal lines and spots of dark brown. Tibiae rufous, with transverse bars of a darker 

 shade of the same color. Tail bright rufous; tip paler, with a subterminal band of black. This second plumage, described 

 above, we have never seen in Buteo borealis. 



Sangre del Christo Pass. (6.) Iris whitish. 



CIRCUS HUDSONIUS, Linnaeus, (p. 38.)— The Marsh Hawk. 



Falco hudsonitts, Linn. Syst. Nat. I, 128, (1766.) 



Adult. — Form rather long and slender; tarsi long; ruff quite distinct on the neck in front. Entire upper parts, head, and 

 breast, pale bluish cinereous ; on the back of the head mixed with dark fulvous ; upper tail coverts white. Under parts white, 

 with small cordate or hastate spots of light ferruginous ; quills brownish black, with their outer webs tinged with ashy, and a 

 large portion of their inner webs white ; tail light cinereous, nearly white on the inner webs of the feathers, and with obscure 

 transverse bands of brown ; under surface silky white ; under wing coverts white. 



Younger. — Entire upper parts dull umber brown, many feathers edged with dull rufous, especially on the neck ; under parts 

 dull reddish white, with longitudinal stripes of brown, most numerous on the throat and neck before; tibiae tinged with reddish; 

 upper tail coverts white. 



Young. — Entire upper parts dark umber brown ; upper tail coverts white. Under parts rufous, with longitudinal stripes of 

 brown on tlio breast and sides ; tail reddish brown, with about three wide bands of dark fulvous, paler on the inner webs. Tarsi 

 and toes yellow. 



Total length, female, 19 to 21 inches; wing 15J, tail 10 inches. Male, total length 16 to 18 inches; wing 14i, tail 8J to 9 

 inches. 



6859. Rocky mountains. (4.) — Desert between White river and San Rafael creek, Utah. (28.) 

 TINNUNCULUS SPARVERIUS, Vieill. (p. 13.)— Sparrow Hawk. 



Falco sparveiius, Linn. Syst. Nat. I, 17CC, (128.) 



No. 8519. Cochetope Pass. 



OTUS WILSONIANUS, Lesson, (p. 53.)— The Long-eared Owl. 



Olus icilsonianus, Lesson, Traite d'Orn. I, p. 110. (1831.) 



Sp. Cii. — Ear tufts long and conspicuous; eyes rather small; wings long; tarsi and toes densely feathered. Upper parts 

 mottled with browninh black, fulvous, and ashy white; the former predominating. Breast pale fulvous, with longitudinal stripes 

 of brownish black ; abdomen white ; every feather with a wide longitudinal stripe, and with traosTerse stripes of brownish black ; 



