BIRDS OF ETHIOPIA AND KENYA COLONY 421 



One male and two females, Sagon River, Ethiopia, June 3-5, 1912. 



One male and two females, Endoto Mountains, south, Kenya Col- 

 ony, July 21-23, 1912. 



One female and three young males. Tana River, camp 3, Kenya 

 Colony, August 16-17, 1912. 



One male, Tana River, above camp 3, Kenya Colony, August 17, 

 1912. 



One young male. Tana River, below camp 4, Kenya Colony, 

 August 17, 1912. 



One male, one female, and one young male. Tana River, at mouth 

 of Thika River, Kenya Colony, August 23-25, 1912. 



One young male, Thika River at Boulder Hill, Kenya Colony, 

 August 28, 1912. 



Soft parts : 



Adult male. — Bill orange red on basal two-thirds succeeded by 

 white in the middle, reddish brown to brownish black on the com- 

 missural line and at the tip of both mandible and maxilla. 



iTrmiuture Tnale. — Bill brownish orange on basal half, then whitish, 

 and dusky at tip and along commissure. 



Adult female. — Bill, all black; naked sides of throat, flesh color 

 and blue anteriorly, red posteriorly; feet, black anteriorly, flesh 

 color (or white) posteriorly; iris, brown. 



Von der Decken's hornbill is a denizen of the rather arid thorn- 

 bush country of eastern Africa from central Tanganyika Territory 

 (Iringa, Useguha, Mpapua, Morogoro, etc.) north through Kenya 

 Colony to eastern Uganda, Jubaland, southern Somaliland, Arussi- 

 Gallaland, and Shoa to the vicinity of Harrar. Owing to the long- 

 continued confusion in the literature of this species and its near ally, 

 jacksoni, it is rather difficult to demarcate the geographical limits of 

 either very definitely. 



Ogilvie-Grant ^^ described jacksoni from the Turkwell region on 

 the northern Kenj^a-Uganda border. In 1905 Erlanger ^"-stated that 

 jacksoni was the young of deckeni and Zedlitz '''^ upheld this con- 

 clusion, and consequently extended the range of deckeni to Turk- 

 well and Uganda. Claude Grant ^- pointed out that the two were 

 really distinct, but closely related, species, and figured the heads of 

 both sexes of each to show the differences in the bill, but unfortu- 

 nately transposed the names on the figures so that the figures labeled 

 jacksoni reall}* represent deckeni and vice versa. Van Someren ^^ 



«»Ibis, 1891, p. 127. 



■"•Journ. f. Ornith., p. 441. 



"Idem, 1915, p. 26. 



T^Ibis, 1915, pp. 274-276. 



''' Nov. Zool., vol. 29, 1922, p. 76. 



