THE GUENONS. 67 



thighs, and fore-arms, black ; the under side of the body and 

 inner side of the hmbs pure white, separated by an abrupt hne 

 from the colours of the outer surfaces ; the transverse black 

 5and above the eyebrows extending from the outer corner of 

 the eyes to the ears ; nude parts of face, ears, and hands livid 

 flesh-colour ; the whiskers bushy, covering much of the cheeks, 

 descending on the sides and lower part of the neck, pale yello.v, 

 speckled with black marks. 



The white bars on each side of the tail, on the rump, and 

 the white frontal band distinguish this species from all others. 



Distriljutioii. — West Africa : Cameroons. 



XXIII. SYKES' GUENON. CERCOPITHECUS ALBIGULARIS. 



Semiiopithecus ? albogtilaris, Sykes, P. Z. S., 1831, p. 106. 



Cercopithecus albigularis^ Sykes, P. Z. S., 1832, p. 18; Owen, 

 P. Z. S., 1832, p. 18 (anatomy) ; Martin, Mamm. An., p. 

 512 (1841) ; Frazer, Zool. Typ., pi. ii. (1848) ; Wagner in 

 Schreb. Sciugeth. Suppl., v., p., 45 (1855); Gray, Cat. 

 Monkeys Brit. Mus., p. 24 (1870); Schleg., Mus. Pays- 

 Bas, vii., p. 79 (1876); True. Pr. U. S. Nat. Mus., xv., p. 

 448(1893); Sclater, P. Z. S., 1893, p. 251; Matschie, 

 S.B., Nat. Fr. Berl., 1893, p. 215; Thomas, P. Z. S., 

 1894, p. 137. 



Cercopithecus erytlirarchus, Peters., Pvcis. Mossamb. Saugeth., 

 p. I., pi. i. ; Schl., Mus. Pays Bas, vii., p. 77 (1876) ; Kirk, 

 P. Z. S., 1864, p. 649 ; Reuvens, Zool. Gart., xxx., p. 207 

 (1889) ; Oudem, op. cif., xxxi., p. 267 (1890) ; Scl., P. Z. S., 

 1893, p. 249 (female). 



t Cercopithecus moiwides^ Geoffr., Arch, du Mus., ii., p. 558, 

 pi. 31 (1841) ; id., C. R., XV., p. 1038 (1842) ; id.. Diet. Hist. 

 Nat., iii., p. 303 (1849); Scl., P. Z. S., 1893, p. 256. 



F 2 



