OTIDJB OTIS 289 



Key of the Species. 



A. Very large; wing 23 to 31 inches; head 



strongly crested ; neck transversely banded 



with black and white 0. ^oW, p. 808. 



B. Large ; wings 17 to 23 inches ; head not 



conspicuously crested. 



a. Tail with white cross-bands ; back with- 

 out arrow-shaped markings 0. caffra, p. 300. 



6. Tail with buffy-mottled cross-bands ; back 

 with arrow-shaped markings of sandy- 

 buff 0. ludivigi, p. 298. 



Pig. 94.— Left foot of Otis afra. x i 



C. Smaller ; wings less than 15 inches. 

 a. Beneath black, at least on the lower breast 

 and abdomen, 

 o'. With a very distinct nuchal crest of 

 vinous red in the male ; back with 

 arrow - shaped markings of sandy- 

 rufous O. rufcrista, p. 290. 



&'. Without a conspicuous crest. 

 a^. Throat and neck black all round. 



a'. Quill-lining black 0. a/ra, J*, p. 292. 



6'. Quill-lining white O. afroides, ^ , ^. 294. 



V\ Throat black, connected with the 



black breast only by a narrow line 



a'. Bump and tail freckled buff like 



the upper back O.melanogaater, J*, p. 302. 



6^. Rump and tail black contrasting 



with the back 0. ^acMattii, p. 304. 



c'. Throat and neck not black but 

 mottled and cross-barred, black and 

 sandy, like the back. 

 19 VOL. IV. 



