W. R. OGILVIE-GEANT— AVES. 351 



Cisticola chubbi Sharpe. (Plate XIX. fig. 14, egg.) 

 Cisticola chubbi Reich. Yog. Afr. iii. p. 501 (1905) ; Jackson, Ibis, 1906, p. 545 (Ruwenzori); 

 Grant, Bull. B. 0. C. xxi. p. 73 (1908). 



a-d. 6 2 . Mubuku Valley, E. Ruwenzori, 6000 ft., 30th & 31st Dec. [Nos. 58. 



B. E. D. ; 2039, 2041, 2043. G. L.~] d 



e-p. 6 ? . Mubuku Valley, E. Ruwenzori, 6000 ft., lst-28th Jan. [Nos. 125, L33. 



d. d. d. 



B.E.B.; 1082. 1083, 1089, 1099, 1138. B.C.; 2046, 2123. G.L.; 3110, 3111. 

 h'. B. W.] d 



q-t. 6 ? . Mubuku Valley, E. Ruwenzori, 6000 ft., 8th & 11th Feb. [Nos. 152, 



153. B. E. I). ; 3156, 3157. B. B. IF.] 



u-a. d 2 et d imm. Mubuku Valley, E. Ruwenzori, 5000-7000 ft., 9th-23rd 



March. [Nos. 204. B. E. I).; 1334, 1352. D. C. ; 2177, 2221. G. L.; 3216, 3252. 

 B. B. W.} 



Iris chestnut, hazel, or dark brown ; bill black ; feet flesh-colour or light brown. 



An immature male differs from the adult in having the upperparts reddish-brown, 

 almost like the crown, the dusky subterminal spots to the tail-feathers very indistinct, 

 and the tips of the feathers light rust-colour. 



Two eggs are of a regular oval form and somewhat glossy. The ground-colour is 

 pale blue, very finely marked all over, but especially round the larger end, with light 

 red. They measure respectively - 78X'56 and - 75x , 56 inch. 



[Chubb's Grass-Warbler was found on Ruwenzori from 5000 ft. up to the forest- 

 line and in all the open clearings up to 8000 ft. On reaching Ruwenzori this species 

 was one of the first birds to attract attention, not only on account of its numbers and 

 its fearlessness of man, but because of its loud note and curious habits. The male 

 birds seem to spend almost the whole day in singing, always two and sometimes 

 three or four joining together. As a rule, however, two are to be seen on a tall grass- 

 stem close together and facing each other. With tails spread they bob up and down, 

 bowing to each other and turning round and round in the most amusing manner, 

 while at the same time they keep up an incessant babel of noise. Suddenly one will 

 fly off to another spot and be followed by the others, when the same performance is 

 repeated. The song always sounds as if each of the birds was singing a different part, 

 and for this reason we nicknamed them the ''Duet Grass- Warblers." A nest found 

 in January was placed in a bunch of dead grass about 5 feet from the ground, it 

 was domed and composed of blades of dead grass and roots, lined with finer grass 

 and roots. It matched its surroundings so perfectly that it was quite invisible. — 

 B. B. W.] 



