. A history of North American birds [microform] : land birds. Birds -- North America; Ornithology -- North America; Oiseaux -- Amérique du Nord; Ornithologie -- Amérique du Nord. —THE Caban., and alvirr, IJaiid. The first-immcMl is totally unlike the R.^t, which are nioic tdosely related in ai>pearanee. In studvini,^ carefully a very large series of specimens of all the species, the l'on(nvini4 facts become evident: — 1. In autumn and winter the "olive" coh)r of the plumage assumes a browner cast than at ot^er seasons ; this variation, however, is the same in
. A history of North American birds [microform] : land birds. Birds -- North America; Ornithology -- North America; Oiseaux -- Amérique du Nord; Ornithologie -- Amérique du Nord. —THE Caban., and alvirr, IJaiid. The first-immcMl is totally unlike the R.^t, which are nioic tdosely related in ai>pearanee. In studvini,^ carefully a very large series of specimens of all the species, the l'on(nvini4 facts become evident: — 1. In autumn and winter the "olive" coh)r of the plumage assumes a browner cast than at ot^er seasons ; this variation, however, is the same in all the sjiecies (and varieties), so that in autunin and winter the several species dilfer from each other as nuich as they do in spring and summer. Of these five species, two only {palhisi and siraiHsoni) inhabit the whole breadth of the continent; and they, in the three ?\uinal rnninces over which they ex- tend, are moditied into "races" or "va- rieties" characteristic of each region. The first of these species, as the paJIcd var. jiiillasi, extends westward to the liocky Mountains, and migrates in winter into the South; specimens are very nuich browner in the winter than in spring; but in the liocky ^lountain region is a laruer, rown as any Central American specimen. Along the IVicific Province, from Kodiak to Western ^lexico, and occasionally stra^nlinu: eastward toward the Itockv Mountain svstem, there is the var. nanus, a race shmlln- than tlie var. pallasi, and with much the same colors as var. ojidahoni, though the rufous of the tail is deeper than in either of the other forms. In this race, as in the others, there is no ditierence in size between si)ecimens liom north and south extremes of its distribution, because the breeding-]dace is in the Xorth, all Southern specimens being winter sojourners from their Xorthern birthplace. The T. sicaiiisoni is found in abundance westward to the western limit of the liocky ^lountain system; in the latter
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectbirdsnorthamerica
