Vol. 5, p. 327-328. September 2, 1930. 



Occasional Papers 



OF THE 



Boston Society of Natural History. 



THE FORMS OF THE WHITE-BROWED ROBIN-CHAT, 

 COSSYPHA HEUGLINI HARTLAUB. 



BY HERBERT FRIEDMANN.^ 



The treatment of the forms of the White-browed Robin-chat 

 in Sclater's Systema Avium Aethiopicarum (pt. 2, 1930, p. 470- 

 471) is incomplete and, as far as the material examined by me is 

 concerned, inaccurate. He lists three races; I recognize five, 

 one of which is new at this point. The new one is the most 

 southeastern of the five and extends the known range of the 

 species southward along the coast for about 500 miles beyond 

 the limits given by Sclater. It may be known as 



Cossypha heuglini euronota, subsp. nov. 



Type. — Museum of Comparative Zoology no. 134467; adult female, col- 

 lected at Lumbo, Mozambique, on July 17, 1918, by Arthur Loveridge. 



Subspecific characters. — Similar to intermedia of coastal Kenya Colony, but 

 much more olive greenish above, having practically no slate blue on the 

 upper back; slightly paler below. Size as in intermedia. In other words, 

 it has the coloration of heuglini and the dimensions of intermedia. 



Measurements of type. — Wing 83, tail 79, culmen from base 20 mm. 



Range. — Known only from the type locality. It may be that 

 Thomson's Rovuma birds and Grote's Mikindani specimens 

 {Journ. f. Ornith., 1913, p. 141) are of this form. 



Remarks. — The races of this bird may be briefly summarized 

 as follows: 



1. C. h. heuglini Hartlaub: from the Omo valley and extreme 

 southern Shoa (under 5000 feet), to the Upper White Nile, 

 west to Darfur and the Shari River, south throughout Uganda 

 (except in southern Ankole Province) and the western half of 

 Kenya Colony to the Ikoma district and the Usambara Moun- 

 tains, Tanganyika Territory. 



2. C. h. occidentalis Reichenow: south Ankole, and the eastern 



^ Published by permission of the Secretary of the Smithsonian Institution. 



327 



