. Bulletin of the British Ornithologists' Club. Vol. 76 82 1956 by a palpably smaller bird with wings in S3 125 — 132, ?? 122 — mm. The two races occur quite close together, because specimens in the Durban Museum collection from Melmoth, in Zululand, are D. a. adsimilis, while a series from near Gollel, in southern Swaziland (95 miles to the ), are referable to the small race. When viewed in series the structural differences separating the two forms are most marked (see Figures), affecting all the more important physical proportions, but in addition to these there are minutiae of plu
. Bulletin of the British Ornithologists' Club. Vol. 76 82 1956 by a palpably smaller bird with wings in S3 125 — 132, ?? 122 — mm. The two races occur quite close together, because specimens in the Durban Museum collection from Melmoth, in Zululand, are D. a. adsimilis, while a series from near Gollel, in southern Swaziland (95 miles to the ), are referable to the small race. When viewed in series the structural differences separating the two forms are most marked (see Figures), affecting all the more important physical proportions, but in addition to these there are minutiae of plumage colouration which are considered to be of equal subspecific import. The small-sized birds are deeper, less bluish, black throughout, and the pale inner webs to the major flight feathers are appreciably whiter than in topotypes of the nominate race. The general pallor of the major flight feathers is most marked in life in these small-sized birds of the south-east African lowlands, and in the dry, colourless thorn country on a hot day birds hawking for insects seem almost to have white-tipped Map depicting the ranges and zones of intergradation of the African Drongo races, D. a. adsimilis and D. a. fugax Horizontals = D. a. adsimilis. Verticals = D. a. fugax. Cross-hatching = Zones of intergradation Figures contained in circles represent the mean wing-length of local adult j ^(to nearest integer), either measured for this study or from data extracted from the literature. 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 Taylor, Nancy M. Oxford : Clarendon Press
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