. Bulletin of the British Ornithologists' Club. Birds. M. Louette 115 1988 108(3). Figure 1. Ploceus superciliosus. Localities of specimens from Zaire, Rwanda, Burundi, Zambia, Angola and Congo. The species occurs also in extreme northwestern Tanzania and widely in Uganda, Sudan and further west; also in Gabon. Open circles indicate the dimor- phic populations, black circles the (supposedly) monomorphic population. Shading indicates equatorial rainforest block. plumage (just as I consider it is now the case in southern Zaire and northeastern Angola), but among specimens I have seen
. Bulletin of the British Ornithologists' Club. Birds. M. Louette 115 1988 108(3). Figure 1. Ploceus superciliosus. Localities of specimens from Zaire, Rwanda, Burundi, Zambia, Angola and Congo. The species occurs also in extreme northwestern Tanzania and widely in Uganda, Sudan and further west; also in Gabon. Open circles indicate the dimor- phic populations, black circles the (supposedly) monomorphic population. Shading indicates equatorial rainforest block. plumage (just as I consider it is now the case in southern Zaire and northeastern Angola), but among specimens I have seen from East Africa, both phenotypes occur. Fig. 1, based on all specimens examined and their localities (and those from Chapin 1954) illustrates the phenotype distribution in Zaire and surrounding areas and it also corrects Hall & Moreau's (1970) map which shows too many records in the forested part of Zaire, for which I am unable to trace the source in the literature. Later, Lippens & Wille (1976) mentioned P. superciliosus in Zaire from Kwilu (±6°S, 19°E) and Dubois (1905) had mentioned a specimen from "Ruzizi-Kivu"(?), still in KMMA, but not included on the map. Fig. 1 shows clearly a circum- forest lowland distribution, the species not entering the equatorial forest belt as such and being also absent from the higher altitudes in eastern Zaire. In neighbouring countries, it is widespread in Uganda, but in Tanzania is limited to the extreme northwest. The southern Zairean population is thus probably isolated from the East African birds. Along the middle Zaire river however, as mentioned already, there is possibly a contact between northern and southern populations. It was shown for other species (see Louette & Prigogine 1982) that along this river there possibly existed a connecting path of non-forest vegetation. Also, since P. superciliosus is present in north-central Gabon (Brosset & Erard 1986) and in southern Cameroon (Louette 1981), regions no
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