880 HETERHYPHANTES STEPHANOPHORUS 



Type, adult male. Forehead and two-thirds of the crown yellow, which 

 colour extends back as a broad margin to the black eye-stripe and joins the 

 yellow of the ear-coverts, cheeks and sides of the middle throat ; remainder 

 of the plumage jet black, with a slight wash of yellow on the under tail- 

 coverts. "Iris crimson brown; bill black; legs horn blue." Total length 

 5-8 inches, culmen 07, wing 30, tail 2-3, tarsus 0-85. J , 14. 9. 89, Mau 

 (Jackson) . 



Female. Similar to the female of H. melanogaster, but with the frontal 

 patch narrower, measuring only O'O inch back from the bill. Total length 

 5-75 inches, culmen 0-65, wing 2-9, tail 2-2, tarsus 08. 24. 4. 98, Nandi 

 (Jackson). 



Immature. Upper parts dusky black, with some rufous yellow edges to 

 the feathers of the forehead and crown ; remainder of head, chin and throat 

 rufous buff, mottled with black on the sides of the head and inclining to 

 dusky black in front of the eye ; breast and under tail- coverts pale dusky 

 brown, darker on the flanks and somewhat mottled on the crop, with 

 darker centres to the feathers. Bill brown, much paler below. ? , 10. 4. 98, 

 Nandi (Jackson). 



Jackson's Yellow-headed Black Weaver inhabits the Mau 

 and Nandi district of the Equator. 



The species is closely allied to H. melanogaster, but differs 

 in the full plumaged birds having less yellow on the top of 

 the head, otherwise the females are hard to distinguish, but 

 the male is easily recognised by the absence of any yellow 

 pectoral collar, the entire throat and breast being uniform 

 black. The type, which has been well figured, is an adult 

 male discovered by Mr. Jackson in Mau ; at the Eldoma 

 Ravine and Nandi he has obtained young birds in July and 

 adults of both sexes in April, June and July, and there can, 

 I think, be no doubt but the specimens from these localities 

 which have been referred to II. melanoij aster are females of this 

 species, which at present is known only from a very limited 

 area, and H. melanogaster is probably a rather local West 

 African form. 



