420 BULLETIN 15 3, UNITED STATES NATIONAL MUSEUM 



Guaso Nyiro below the Chanler Falls, while in the southern part of 

 the country it is known from Ndi, Manugu, Tsavo, Bura, and Sagala. 



Erlanger found it breeding early in April at Dagaje in the Gurra 

 country, where he obtained three eggs on April 5. 



The Juvenal plumage is similar to that of the adult stage, but the 

 breast feathers lack the black shaft streaks and there is no bare 

 space on the lower throat. The young female collected on July 17 

 in the Indunumara Mountains is in fresh plumage (in fact the cen- 

 tral pair of rectrices are still basally encased in their sheaths) and 

 appears to have been out of the nest not more than a fortnight. 

 The immature male taken on July 10 southeast of Lake Rudolf is 

 in postjuvenal molt. In this molt only some of the body plumage 

 is changed but the ju venal remiges and rectrices and their coverts are 

 retained. The incoming pectoral feathers have black shaft streaks 

 and the bird becomes indistinguishable from older ones after assum- 

 ing the first winter plumage. 



The birds collected from December through February are in worn 

 plumage, while those taken in June and July are in fresh plumage, 

 with one exception — the female collected at Le-se-dun on July 26 

 which is much abraded. Adult birds vary considerably with regard 

 to the extent of the bare area on the lower throat. In some the naked 

 skin forms a U with arms running cephalad along the sides of the 

 throat, the basal part of the U being posterior. In others the basal 

 part is nonexistent, that is, there are two lateral bare areas, while 

 in others, the basal part is interrupted by a thin line of feathers on 

 the midline of the throat. 



Mearns observed this hornbill as follows: Tertale, June 7-12, 22 

 seen; El Ade, June 12-14, 10 birds; Mar Mora, June 15, 10; Turturo, 

 June 15-17, 10 noted ; Anole, June 17, 10 ; Wobok, June 18, 10 birds ; 

 near Saru, June 19, 10 seen ; Yebo, June 20, 10 seen ; Karsa Barecha, 

 June 21, 20 birds noted; Chaffa villages, June 22-25, 4 noted; Hor, 

 June 26-30, 12 seen ; southeast of Lake Rudolf, July 9-12, 12 birds ; 

 Indunumara Mountains, July 13-18, 25 seen ; plains at base and south 

 of Endoto Mountains, July 19-24, 500 noted; Er-re-re, July 25, 100; 

 Le-se-dun, July 26, 100; Malele south to the Northern Guaso Nyiro 

 River, July 27-31, 139 birds recorded. 



LOPHOCEROS DECKENI (Cabanis) 



Buceros {Rhynclioceros) deckeni Cabanis, in von d. Decken. Reisen, vol. 3, 

 pt. 1, p. 37, pi. 6, 1S69: East Africa. 



Spedmens collected: 



One male and one female, Serri, Ethiopia, February 13, 1912. 

 Ten males and eight females, Gato River near Gardula, Ethiopia, 

 April 1 to May 4, 1912. 



