OTID.E OTIS 289 



Key of the Species. 



A. Very large ; wing 23 to 81 inches ; head 



strongly crested ; neck transversely banded 



with black and white 0. Jcori, p. 308. 



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. 



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



with arrow-shaped markings of sandy- 

 buff 0. ludwigi, p. 298. 



FIG. 94. Left foot of Otis afra. x ^ 



C. Smaller ; wings less than 15 inches. 

 a. Beneath black, at least on the lower breast 



and abdomen. 



a/ 1 . With a very distinct nuchal crest of 

 vinous red in the male; back with 

 arrow - shaped markings of sandy- 

 rufous 0. ruficrista, p. 290. 



6 1 . Without a conspicuous crest. 



6 2 . Throat and neck black all round. 



-a 3 . Quill-lining black 0. afra, $, p. 292. 



6 3 . Quill-lining white O. afroides, $ , p. 294. 



W. Throat black, connected with the 



black breast only by a narrow line 



a. 3 . Rump and tail freckled buff like 



the upper back 0. melanog aster, J , p. 302. 



6 3 . Rump and tail black contrasting 



with the back 0. hartlaiibi, p. 304. 



c 2 . Throat and neck not black but 

 mottled and cross-barred, black and 

 sandy, like the back. 

 19 VOL. IV. 



