6 Mr. W. L. Sclater on Birds collected 



but owing to its freqiieuting dense places it is very often 

 impossiljle to detect it. The call is '' kroo-kroo/^ low and 

 penetrating, and is heard just after sundown and through- 

 out the night. AVhen flushed in the daytime it does not 

 call. 



The soft parts are : — 



^ . Irides yellow; bill pale yellow. 



? . Irides yellow; bill greenish yellow,] 



501. Falgo biaruicus. 



CC. Klipfontein, May (1). 



[Since the Central Cape Colony trip I have only observed 

 this Falcon in Namaqualand, the Cape Peninsula, Zululand, 

 and the South-Eastern Transvaal. It is generally observed 

 in pairs, and in habits much resembles the European 

 Peregrine. 



The soft parts of an adult are : — Irides dark brown ; cere 

 and round eye lemon-yellovr ; bill light slaty at base, dark at 

 tip; legs and toes lemon-yellow.] 



508. Cerchnkis rupicola. 



CC. Klipfontein,July(2); PlettenbergBay,Feb., Mch. (3); 

 Z. Sibudeni, Nov., Dec. (4) ; Umfolosi Station, July (1) ; 

 Tv. Wakkerstroom, Mch., Apl. (9); Zuurbron, May (1). 



The two adult females from Klipfontein are quite per- 

 ceptibly paler than those from the other parts of South 

 Africa. This is what would be expected from the desert 

 nature of Namaqualand. 



[This Kestrel is usually seen in pairs and is never found 

 far from mountainous country, in the krantzes of which it 

 feeds and roosts. In flight it much resembles C, tinnuncidns, 

 hovering like that species ; the cry is loud and often repeated, 

 especially in the breeding-season. The food consists mainly 

 of mice, insects, especially grasshoppers and locusts, and 

 occasionally small birds. It is very plucky, and I have 

 seea it attack Crows and Hawks that have approached 

 its quarters, and on one occasion I saw^ a pair stoop many 

 times at a winged Knorhaan. 



