. Bulletin of the British Museum (Natural History). 314 VARIATION IN THE WESTERN ZOSTEROPIDAE (AVES) Cameroon Mt. and the south-western Transvaal, where two different forms are fully sympatric. In a third area, Zululand and its neighbourhood, two forms inter- digitate, separated ecologically and apparently interbreeding little, while throughout north-eastern Africa a series of lowland forms, which I believe to form one polytypic species, surrounds a galaxy of isolated and well-differentiated montane populations. Besides the aberrant bird on the top of Cameroon Mt. which I keep in the genus. SE
. Bulletin of the British Museum (Natural History). 314 VARIATION IN THE WESTERN ZOSTEROPIDAE (AVES) Cameroon Mt. and the south-western Transvaal, where two different forms are fully sympatric. In a third area, Zululand and its neighbourhood, two forms inter- digitate, separated ecologically and apparently interbreeding little, while throughout north-eastern Africa a series of lowland forms, which I believe to form one polytypic species, surrounds a galaxy of isolated and well-differentiated montane populations. Besides the aberrant bird on the top of Cameroon Mt. which I keep in the genus. SENeCALCNSlS • • • MONTAME SEHCCAICNSIS • • • POPULATIONS ISOLATED AMONG • • • LOWLAND ABVSSINICA. ^^ ABYSSINICA. Map I. The ranges of Zo5(f)-o^s species. Speirops (see discussion in Part 5) I provisionally group the African Zosterops as shown in Map i : Z. pallida, monotypic in south-western Africa and overlapping— Z. virens, occupying the rest of South Africa and interdigitating with— Z. senegalensis, a highly polytypic species occupying most of tropical Africa and becoming purely montane in the northeast, where it is surrounded by— Z. abyssinica, a polytypic species characteristic of the dry 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 British Museum (Natural History). London : BM(NH)
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