438 BULLETIN ]5 3, UNITED STATES NATIONAL MUSEUM 



occurs only in Kenya Colony and Tanganyika Territory. The two 

 races may be treated separately. 



1. L. a. alhicaudu^^. — Extreme southeastern Ken3^a Colony (Taveta, 

 Teita district, to Mombasa) and northern Tanganyika Territory to 

 Ugogo and the southern and southwestern shores of Lake Victoria 

 north to Kendu Bay. Of this race, nhhotti Richmond ^ and usuhwinae 

 Neumann ^ are synonyms. The former is merely a fully adult speci- 

 men with a pure white tail. When he described it as abhottl Rich- 

 mond had only the description of alhicaudus in the Catalogue of 

 Birds of the British Museum ^^ to go by, and in that account the 

 central tail feathers are stated to be blackish brown at the base; 

 apparently a subadult bird. The case of usukurtiae is a little harder 

 to settle. This form, said to differ from topotypical alhicaudus in 

 having the white of the underside restricted to the throat and breast, 

 and in lacking a white median stripe extending caudally to the abdo- 

 men, is upheld by three specimens from Mwanza in the Museum of 

 Comparative Zoology. However, the type of abhotti agrees more 

 wnth usul'umae than with alhicandxis^ and as it comes from the area 

 inhabited by the latter, usukuiime must be either a distinct species or 

 an aberrant variation. It is extremely unlikely that two such closely 

 related species could occur together, and, in the absence of true 

 alhicaudus material, I follow Sclater, who, I presume, has had access 

 to sufficient series, in considering usukunwe and ahhotti direct syno- 

 nyms of alhicaudus. It should be noted, however, that Gi'anvik ^^ 

 recognizes usukumae., but makes it a race of Jeucocephalus^ in which 

 he is mistaken. 



In this race the abdomen is fuscous, the feathers tipped with white 

 and the upper wing coverts also tipped with white. 



2. L. a. senex: — Kenya Colony from Nairobi and Ukamba to 

 Lumbwa, Fort Hall, the Thika, Luazomela and Tana Rivers. This 

 race has the under parts pure white and the upper wing coverts witli- 

 out white tips in the adult. 



Reichenow ^- suggested that alhlcaiidun was merely a subadult 

 plumage of senex ^ and Grant ^^ agreed, " * * * that the evi- 

 dence points to that conclusion being correct * * * " .^j^ j ^.qj^. 

 siders that Lyhlus leucoceyhalus will probably be found to be the 

 Juvenal plumage of senex. Van Someren collected a series of both 

 young and adults of both leucocephalus and senex and showed con- 

 clusively that the two were distinct species. The young leucoce- 

 fludus is colored the same as the adults. Three young senex. 



8Auk, 1897, p. 1G4 : Taveta. 



»null. Brit. Orn. CI., vol. 21, 1908, p. 4(i : Kagohi, Usukuma. 



'"Vol. 19, 1891, p. 21. 



" .Jourii. 1'. Oriiith., 1923, Sonderheft, p. 87. 



"Vog. Afr., vol. 2. p. 123. 



"This, 1915, p. 438. 



