■45 [Vol. xlii. 



and the outer primaries show a considerable amount of 

 white, though there is a good deal of individual variation. 

 I should propose to regard the Middle Congo bird as a 

 subspecies of the Gaboon bird. 



As to the nomenclature, the Congo and Welle bird was 

 named by Dubois in 1884 B. leucopygius, but this name is 

 unfortunately preoccupied by B. leiicopygus Giebel, 1876, 

 which appears to be without doubt a synonym of B. sJiarpii 

 and which undoubtedly invalidates Dubois's name. 



I would propose therefore to rename the Congo-Welle 

 bird after M. Dubois, and the following will be the 

 synonymy : — 



Bycanistes sharpii sharpii (Elliot). 



Buceros sharpii Elliot, Ibis, 1873, p. 177 : Angola. 



Buceros leucopygus Giebel, Zs. Gesammt. Naturw. xiii. 

 1876, p. 73 : Gaboon. 



Distribution. Northern Angola to Gaboon and the western 

 part of southern Cameroon. 



Bycanistes sharpii duhoisi, nom. nov. 



Buceros leucopygius Dubois, Bull. Mus. Beige, iii. 1884, 

 p. 202, pi. X. fig. 1 : Nyam-Nyam, Upper Welle distr. 



Distribution. The middle reaches of the Congo to eastern 

 Cameroon (River Ja) and the Welle. 



LOPHOCEROS CAMUEUS. 



A glance at the series of this Hornbill in the British 

 Museum shows that those from Upper Guinea can be easily 

 distinguished from those from Gaboon and the interior of 

 the Belgian Congo by their darker upper parts, and especially 

 by the colour of the top of the head, which is considerably 

 darker than the back ; while in the Gaboon bird the crown 

 and back are of the same shade, and do not contrast with 

 .one another. 



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