422 ZOOLOGICAL RESULTS OF THE RUWENZORI EXPEDITION. 



The adult female (h) is in moult, and the partially grown upper tail-coverts resemble 

 the older feathers, being black glossed with green and barred with buff. In the most 

 adult female specimens the upper tail-coverts are uniform black glossed with green 

 and devoid of buff bars. The uniform upper tail-coverts are apparently assumed at an 

 earlier age by the male than by the female. 



Centroptjs supercilioscs Hempr. & Ehr. 



Centropus supercUiosus Reich. Vog. Afr. ii. p. 65 (1902). 



a. ?. 80 miles W. of Entebbe, 3700 ft., 2nd Dec. [No. 20. B. E. B.] 



b. 6 . Mokia, S.E. Ruwenzori, 3400 ft., 26th April. [No. 239. B. E. D.] 



c-h. 6 $ et d 2 imm. Mokia, S.E. Ruwenzori, 3400 ft., 12th-31st May. [Nos. 

 282, 330, 375. B. E. 1). ■ 1551. D. C. ; 2287. G. L. ; 3433. B B. W.] 



i-l. 6 ? et 2 imm. Mokia, S.E. Ruwenzori, 3400 ft., lst-12th June. [Nos. 41G, 

 449. B. E. I). ; 3439. B. B. W.~\ 



Adult. Iris crimson or red (in No. 3439 dark brown); bill black; feet blue or 

 bluish-grey. 



Immature. Iris grey or stone-colour ; bill black; feet slate-colour. 



The colour of the underparts varies considerably in adult examples of this species ; 

 in some the ground-colour is strongly washed with buff, in others it is nearly white 

 (as is the case in all adult birds from Sokotra). This difference in tint, however, is 

 due neither to locality nor season, for two adult males (Nos. 239 and 330) from Mokia, 

 killed respectively in April and May, represent both types of coloration. 



[A few examples of the White-eyebrowed Lark-heel Cuckoo were seen near Entebbe : 

 they were very plentiful among the acacia-trees at the south end of Ruwenzori. The 

 flight of this bird is remarkably weak and laboured, and during windy or rainy 

 weather it appears quite helpless and almost unable to fly. Unless hustled, it usually 

 works its way to the top of a thorn-bush as a point of vantage, from which it makes a 

 blundering dive into the bottom of the next bush. 



In the early morning its call might be heard in every direction, and Mr. F. J. Jack- 

 son has aptly compared it with the sound of water being poured quickly from a large 

 bottle.— B. B. W.] 



Full details of the habits and call of this Cuckoo will also be found in my paper on 

 the Birds of Sokotra [cf. Nat. Hist. Sokotra and Abd-el-Kuri, Birds, p. 43 (1903)]. 



Coccystes cafer (Lichtenstcin). 



Coccystes cafer Reich. Vog. Afr. ii. p. 76 (1902). 



a, b. 6 . Mokia, S.E. Ruwenzori, 3400 ft., 27th & 30th April. [Nos. 24G. B. E. I). ; 

 1462. D. C] 



