. A history of British birds. Birds. ARCTIC BLUE-TimOATED ROBIN. 275 I found this species by no means uncommon in the swampy districts near Valkenswaardj in Holland. The only difference between this and the preceding species is in the colour of the throat-spot, which is pure white. There are three forms of the Blue-throated Robin, the adult males of which, when in full breeding- plumage, may be readily distinguished. First, we have the Northern or Arctic form, with the spot in the centre of the throat red; secondly, the South-European form, with the spot in the centre of the throat pure and si
. A history of British birds. Birds. ARCTIC BLUE-TimOATED ROBIN. 275 I found this species by no means uncommon in the swampy districts near Valkenswaardj in Holland. The only difference between this and the preceding species is in the colour of the throat-spot, which is pure white. There are three forms of the Blue-throated Robin, the adult males of which, when in full breeding- plumage, may be readily distinguished. First, we have the Northern or Arctic form, with the spot in the centre of the throat red; secondly, the South-European form, with the spot in the centre of the throat pure and silky white; and thirdly, the form of which the throat is uniform blue. The two former of these birds have different breeding-grounds, and quite distinct areas of geographical distribution ; but the uniform-blue-throated form is chiefly met with in localities frequented by the Southern or white- spotted form. In the specimens I have examined of this blue-throated form, in which the breast at first sight appeared unspotted blue, I have generally found the bases of the feathers on the throat white. Newton, in his edition of Yarrell's ' British Birds,' asserts that these differ- ences of plumage (especially in the white-spotted and spotless forms) are coexistent with differences in the length of the tarsus; but in an examina- tion of a series of these birds, T find that the measurement of the tarsus is a variable quantity, and of no value in separating the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Seebohm, Henry, 1832-1895. London, Pub. for the author by R. H. Porter [etc. ]
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbirds, bookyear1883
