464 Mr. W. R. Ogilvie-Grant on 
192. Hydroprogne caspia. 
Hydroprog7ie caspia (Pall.) ; Saunders, Cat. B. Brit. Mus. 
XXV. p. 32 (1896). 
Sterna caspia Pall. ; N. C. Roths. & WoUast. p. 30. 
[1 saw the Caspian Tern near Khartum and also up the 
White Nile, but it was not observed south o£ Abba Island. — 
R. M. H.] 
193. Hydrochelidon leucoptera. 
Hydroclielidon leucoptera (Schinz) ; Grant, Ibis, 1900, 
p. 330 ; Witherby, p. 274. 
a. ? . Kaka, 28th April. No. 407. 
b. ? Goz-Abu-Gumar, 19th May. No. 514. 
Specimen a of the White-winged Black Tern has partially 
attained the black summer plumage, while in b the change 
is complete. Both have the iris hazel, the bill black, and 
the legs dark red. 
194. ^Hydrochelidon nigra. 
Hydrochelidon nigra (Linu.) ; Saunders, Cat. B. Brit. 
Mus. XXV. p. 17 (1896) ; Witherby, p. 274. 
[Both Hydrochelidon leucoptera and H. nigra were common 
about Omdurman and as far south as Goz-Abu-Gumar. — 
R. M. H.] 
195. Gelochelidon axglica. 
Gelochelidon anglica (Mont.) ; Grant ^ Reid, p. 694 ; 
N. C. Roths. & Wollast. p. 30. 
Sterna anglica Mont. ; Witherby, p. 274. 
a. S . Ed-Duem, 22nd May. No. 538. 
The Gull-billed Tern has the iris dark hazel, the bill 
black, and the legs and feet brownish black. 
196. "^Rhynchops flavirostris. 
Rhynchops flavirostris Vieill. ; Saunders, Cat. B. Brit. 
Mus. XXV. p. 158 (1896). 
[Scissor-billed Terns were not very common, and I never 
noticed them north of Abba Island. — R. M. H.] 
197. *Larus fuscus. 
Larus fuscus Saunders, Cat. B. Brit. Mus. xxv. p. 250 
(1896) ; Witherby, p. 274. 
