590 Mr. A. B. Percival on Birds 
50. BucoRAX CAFFER Bocage j Grant_, Cat. B. Brit. Mus. 
xvii. p. 251 (1892). 
Not uncommon in small flocks of five or six, where 
there is open bush country, particularly near rivers. It 
is very noisy before rain_, calling all night and uttering its 
peculiar double booming cry. 
In Natal and Swaziland Bucorax cafer is called the 
'' Rain-bird.-'^ 
The bare skin of the head and neck is very noticeable 
when the birds are seen even at a distance of one hundred 
yards or more. I did not obtain a single specimen, as they 
were so wild and wary. 
51. LopHOCEROs MELANOLEUCus (Licht. j ; Shcllcy, Ibis, 
1897, p. 544. 
Not uncommon, and usually seen in small flocks. Very 
noisy. I read in my note-book, August 15th, 1898: — 
''' Crowned Hornbills .... are very numerous just now, in 
flocks of six or eight; they are quite fearless, and allow me 
to walk up to the tree on which they are sitting before 
moving.'''' 
52. LopHocEKOS EPiRHiNus (Suudcv.) j Grant, Cat. B. 
Brit. Mus. xvii. p. 408 (1892). 
Very few seen. 
53. CoRYTHORNis CYANOSTIGMA (RUpp.) ; Shcllcy, Ibis, 
1897, p. 544. 
Very common on all the streams or rivers of the Chiromo 
district. 
54. Alcedo semitorquatus Swains. ; Shelley, Ibis, 1894, 
p. 467. 
Not common on the Buo or the Shire. 
55. Ceryle ruuis (Linn.) ; Shelley, Ibis, 1897, p. 544. 
Extremely common on the Zambesi and the Shire, particu- 
larly at Fort Herald, on the Shire, where I often saw parties 
of seven or eight of these birds together. Commonest in 
July and August. 
