. A history of North American birds [microform] : land birds. Birds; Ornithology; Oiseaux; Ornithologie. ^f"^ 53081,^ Roftrhaviiis 53081,:^. The species of this semis are two in number, and are peculiar to the tro])ical portions of America, one of thera being- confined to tlie Amazon region, tlie other extending to Florida in one direction and Buenos Ayres on tlie otlier. Tlieir nearest allies are the si>ecies Clrcits and Elanus, like tliem inliabiting marshy localities, where their food is found, whicli consists, in large part, of small mollusca. Species and Baces. Commo
. A history of North American birds [microform] : land birds. Birds; Ornithology; Oiseaux; Ornithologie. ^f"^ 53081,^ Roftrhaviiis 53081,:^. The species of this semis are two in number, and are peculiar to the tro])ical portions of America, one of thera being- confined to tlie Amazon region, tlie other extending to Florida in one direction and Buenos Ayres on tlie otlier. Tlieir nearest allies are the si>ecies Clrcits and Elanus, like tliem inliabiting marshy localities, where their food is found, whicli consists, in large part, of small mollusca. Species and Baces. Common Ciiahacters. AduU. Prevailing color plumbeous-black, or bluish- phnnbeous; the tail and primaries black. Entirely eoncolored, or with white tail-coverts. Cere and feet oi'ange-red. Young. Spotted with blackish-brown and ochraceons, the former prevailing abov(!, the latter beneath. 1. R. Bociabilis. , with terminal and basal zones of the tail, white; that of tiie tail inoie or less shaded with grayish-brown. Adult. Uniform blackish-phimljeous, darker on the head, quills, and tail. Hah. South America, West Indies, and Florida. riumbeous of a glaucous car-t, the head dark plumbeous, and the wing-coverts lighter, inclining to grayish-brown. Wing, i; - lo.'jO; tail, ; bill, .; tarsus, ; middle toe, (2 sp. P. A. N. S.) Hab. Florida and West Indies . var. plum bens. Plumbeous of a blackish cast, the head deep black, and the wing- coverts not lighter, and not inclining to brownish. Wing, - ; tail, - ; bill, .90 - ; tarsus, ; middle toe, Hab. South America var. .loci ah His.^ 1 Hn.'i/rliamus , var. .sorinlnlis (ViElLL.). Herpffothcrns sociabilis, Nonv. Diet. Hist. Nat. XVIII, 318, 1S18 ; Eiic. Mikh. HI, 1248. Jlostrhamus ., D'Oim. Voy. Am. Merid. II. 73, 1835 ; Syiio]). Av. JIag. Zoiil. Oiiay, List H. lirit. Mus. p. 47 ; Ocii. and Suligcn. Hrit. Mus
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