48 ANATIDJ.. 



Anas riippelli, part., Gieb. Thes. Orn. i. p. 352 (1872). 

 Plectropterus gambiensis, part., Heugl. Orn. N.O.-Afr. ii. 2, p. 1275 

 (1873). 



Adult male. Similar to that of P. gamhensis, but larger, and with 

 a very high frontal knob ; two rhomboidal naked spaces on the 

 sides of the neck ; cheeks and throat white. Total length about 

 40 inches, wing 21-5, tail 10, bill from the gape 3-5, tarsus 4-25. 



Female. Similar to the male, but smaller and without the frontal 

 knob. 



Hah. North-east Africa, westwards as far as the Central part. 



a.[S ?] ad. St. Central Africa. Capt. Clapperton [P.]. 



b. [ 2 ?] ad. St. Africa. Zool. Soc. 



d. Skeleton (head figured, P. Z. S. 1860, p. 30, f. 2). 



2. Plectropterus gambensis. 



Anser gambensis, Briss. Orn. vi. p. 283 (1760) ; Shaiv, Mus. Lever. 

 p. 229, pi. 56 (1793) ; Vieill. N. D. xxiii. p. 328, pi. M 2. f. 1 

 (i818) ; Du7n. Diet. Sc. Nat. xxxv. p. 464 (1825) ; Benn. Zool. 

 Gard. Menag. ii. p. 207 witli fig. (1831) ; Less. Compl. de Buff., 

 Ois. ix. p. 526 (1837) ; id. op. cit. 2nd ed. p. 717 (1838) ; K. Sf B. 

 Wirbelth. Eur. pp. Ixsxiv, 225 (1840) ; Yarr. P. Z. S. 1841, 

 p. 71 (trachea) ; Sckler/. Rev. Crit. p. 106 (Europe?) (1844). 



Anas gambensis, Linn.' S. N. i. p. 195, n. 3 (176(J) ; Gm. S. N. i. 2, 

 p. 503, n. 3 (1788) : Lath. Lid. Orn. ii. p. 839, n. 19 (1790) ; Cuv. 

 Regn. An. i. p. 530 (1817); Lath. Gen. Hist. x. p. 241 (1824); 



Spu ^, , _ - 



Auser spinosus, Bonn. Enc. Meth. i. p. 118, pi. 29. f. 1 (1790) {ex 

 Latham). 



Plectropterus gambensis, Steph. Gen. Zool. xii. 2, p. 7, pi. 36 (1824) 

 {ex Bonnaterre ?) ; Eyt. Mon. Anat. pp. 10, 79 (1838) ; G. R. Gr. 

 List Gen. B. p. 72 (1840) ; Bp. Cat. Met. Ucc. Eur. p. 70, n. 427 

 (1842) ; G. R. Gr. Gen. B. iii. p. 604 (1845) ; Rchnb. Si/n. Av., 

 Natatores, t. 105. f. 246 (1845) ; id. Av. S>/.st. Nat. p. ix (part.) 

 (1852); Licht. Nomeiicl. Av. p. 101 (Senegal) (1854): Hartl. 

 J.f. O. 1854, p. 302 (part.) ; Bp. Compt. Rend, xliii. p. 649, n. 40 

 (part.) (1856) ; Hartl. Syst. Orn. Westafr. p. 246, n. 697 (part.) 

 (1857): Sclat. P. Z. S. 1859, pp. 131, 132, pi. 153. f. 2, 1860, 

 pp. 38, 39 (skull), 40, 41 (trachea); Hartl. J.f. O. 1861, p. 272 

 (Bissao) ; Sclat. P. Z. S. 1864, p. 114 (Unyamuezi) ; Kirk, Ibis, 

 1864, p 334 (Zambesi) ; Schleg. Mus. P.-B,, Anseres, p. 93 (part.) 

 (1866) ; Boo. Jorn. Ac. Sc. Lisb. 1867, p. 148 ; Netct. Ibis, 1867, 

 p. 375 ; Sclat. P. Z. S. 1868, p. 261 (Shire River, E. Africa) ; 

 Sperling, Ibis, 1868, p. 292 (Shir6 River); Sclat. ibid. p. 502 

 (Shire River) ; Eyt. Sijn. Anat. p. 24 (1869) ; Finsch Sf Hartl. 

 Vog. Ost-Afr. p. 802 (1870) ; Boc. Jorn. Ac. Sc. Lisb. 1871, p. 277 ; 

 G. R. Gr. 'Hand-list, iii. p. 73, n. 10553 (part?) (W. Afr., Abyss., 

 Sliire River) (1871) ; Anderss. B. Damara Land, p. 334 (1872) ; 

 Sundev. Meth. nat. Av. dis]}. Teid. p. 145 (1872) ; Boc. Jorn. Ac. 



