W. E. OGILVIE-GEANT — AVES. 431 



These Nightjars were also seen at Fort Beni and Irumu, but never in such numbers 

 as at the south end of Ruwenzori. — R. B. W.~\ 



Family Bucerotidj;. 

 Cekatogymna atkata (Temra.). 



Ceratogymna atruta Reich. Vog. Afr. ii. p. 239 (1902). 

 a. J . Irumu, Eturi Forest, 3000 ft., 18th Oct. [No. 571. R. E. D.] 

 Iris crimson ; bill dark horn-colour ; feet black. 



[A few examples of the Black Hornbill were met with in the Eturi Forest. — 

 R. B. IF.] 



Bycanistes subquadeatus Cabanis. 



Bycanistes subquadratus Grant, Cat. Birds B. M. xvii. p. 419 (1892). 

 Bycanistes subcylindricus Reich. "Viig. Afr. ii. p. 241 (1902) [part.]. 



a, b. d ■ 20 miles W. of Entebbe, 25th Nov. [Nos. 9, 10. R. E. I).] 



Iris dark brown ; bill brown, white at the base of the casque ; feet black. 



Dr. Reichenow considers that the W. African B. subcylindricus Sclater is founded 

 on immature examples of B. subquadratus Cab. ; but lie overlooks the fact that the 

 type of B. subcylindricus, a female, is a perfectly adult bird, having lived for eight 

 years in the Zoological Society's Gardens, Regent's Park. As stated in the description 

 and shown in the figure (P. Z. S. 1S70, p. 668, pi. xxxix.), it has the greater wing- 

 coverts black. 



In addition to the specimens from Entebbe in the present collection there are two 

 adult birds (sex not indicated) from the same neighbourhood in the British Museum. 

 All these four specimens have the greater wing-coverts black widely tipped with 

 white, and at present I see no reason for supposing that B. subquadratus is synonymous 

 with B. subcylindricus, unless it can be proved that the latter is the female and the 

 former the male of the same species. In other species of the group the plumage of 

 the sexes is the same, and the only external difference is to be found in the shape 

 of the casque. 



[This Plornbill was plentiful throughout the journey from Entebbe to Ruwenzori, 

 but was never seen on the mountains. It was very numerous in the Mpanga Forest 

 to the east of Ruwenzori. When flying, its wings make almost as much noise as 

 those of a Swan, and its vocal powers are tremendous. Three or four would some- 

 times perch on the top of a tall tree and hold a concert, a most extraordinary din of 

 raucous cawings. — R. B. IV.] 



