ANSEEBS BABCIDIOENIS 119 



entirely osseous lateral diverticulum or bulb on the left side in the 

 male only. 



This genus contains only two species— the old world form here 

 described with a wide distribution throughout Africa and Southern 

 Asia, and a second one confined to South America. 



Fig. 34. — Left foot of Sarcidiornis melanonota. 



613. Sarcidiornis melanonota. Knob-billed Duck. 



Anser melanotus, Pennant, Ind. Zool. p. 12, pi. xi (1769). 



Sarkidiornis africanus, Eyton, Mon. Anat. p. 103 (1838) ; Layard, B. S. 

 Afr. p. 347 (1867) ; Ayres, Ibis, 1871, p. 266; 1880, p. 112; Barratt, 

 Ibis, 1876, p. 214 ; Eolub §■ Peheln Orn. Siid-Afr. p. 321 (1882) ; 

 Sharpe, ed. Layard's B. 8. Afr. p. 752 (1884) ; Nicolls and Eglington, 

 Sportsm. 8. A., p. 123, pi. xii, fig. 64 (1892) ; Blaauw, Ibis, 1904, p. 74. 



Sarkidiornis melanotus, Gurney in Andersson's B. Damaral. p. 335 

 (1872) ; Shelley, Ibis, 1882, p. 367 [Molopo Eiver] ; Bryden, Gun 

 and Camera, p. 405 (1893); Flecic, Journ. Ornith. 1894, p. 380 

 Beichenow, Vbg. Afr. i, p. 129 (1900). 



Sarkidiornis melanonota, Garrod, P. Z. 8. 1875, p. 152, fig. 1-2 (trachea) 

 P. L. 8clater, P. Z. 8. 1876, p. 694, pi. 67 ; Trimen, P. Z. 8. 1877, 

 p. 683 ; Gates, Matabeleland, pp. 91, 327 (fig. of head) (1881) ; 8alva 

 dori. Cat. B. M. xxvii, p. 54 (1895) ; Shelley, B. Afr. i, p. 170 (1896) 

 Marshall, Ibis, 1900, p. 268; Alexander, Ibis, 1900, p. 443; Gates. 

 Cat. B. Eggs, ii, p. 142 (1902). 



" Comb-duok " of some authors. 



