250 31ii. P. L- SCLATER OI^" THE [Mur. 14, 



Patas (Simla rubra), F. Cuv. Hist. Nat. Mamm. i. pi. 25 

 (1820). 



Chlorocehus ruber, Gray, Cat. Monk. B. M. p. 25 (1870). 



Hab. "West Africa: Senegal (i/«5. Zi«^cZ.). 



The Patas is subject to a certain amount of individual variation, 

 and I was at one time of opinion that it might be possible to 

 distinguish two forms of this species (cf. P. Z. S. 187-1, p. 664). 

 It is much more common in captivity than the Nisnas. 



17. Ceecopithecus pyrehonotus. 



CercopitJiecus pyrrlionotus, Hempr. et Ehr. Symb. Phys. pi. x. ; 

 Geoffr. Diet. univ. d'Hist. nat. iii. p. 307 ; Wagn. Saug. v. p. 42 ; 

 Scl. P. Z. S. 1871, p. 623; id. List Vert. (1883) p. 8; Schleg. 

 Mus. P.-B. Sim. p. 84. 



Cercojnthecus ruber, Eiipp. Neue "Wirbelth. p. 8. 



msnas, P. Cuv. Hist. Nat. Mamm. i. pi. 27 (1830). 



Hab. Kordofan and Darfour (EilppeU) ; Somaliland {Soc. Zool. 

 Viv.). 



We have received altogether seven examples of the Nisnas, 

 which is quite distinct from the Patas when seen alive. A fine 

 male, presented Sept. 29th, 1882, by Mrs. F. Dixon, was stated to 

 have been brought fi'om Somaliland. 



Sect. D. CercojpitTieci melanochiri. 

 The nine species referred to this section, all of which have 

 the arms and legs black or dark cinereous, may be diagnosed as 

 follows : — 



A. Pectore albo. 



a. Stj'iga femorali alba 18. mona. 



b. Striga femorali nulla. 



r Dorso toto concolore ; ano rufo 19. albigularis. 



\ Dorso postico cum ano nigro 20. campbelli. 



B. Pectore ciueveo. 



c. Maculis auricularibus nullis. 



f Dorso concolore 21. samango. 



\ Dorso postico brunneo 22. moloncyi. 



d. Macula utrinque ad aures rubra 23. stairsi. 



C. Pectore rubro 24. erythrog aster. 



D. Pectore nigro. 



Striga femorali alba ; f ronte nigro 25. neglecfus. 



Striga femorali nulla ; fronte albo cincta 26. leucampyx. 



18. Ceecopithecus mona. 



Simla mona, Schreb. Saug. i. p. 97, t. xv. (1775). 



Cercopifheciis mona, Erxl. Syst. Eeg. An. p. 32 (1777) ; Martin, 

 M. An. p. 527 ; Wagn. Saug. Suppl. v. p. 47 (1855) : Gray, P. Z. S. 

 1868, p. 182 ; id. Cat. Monk. B. M. p. 22 (1870) ; Scl. List Vert. 

 (1883) p. 9 ; Schleg. Mus. P.-B. vii. p. 80 (1876). 



Mone {Cercopithecus mona), E. Cuv. Hist. Nat. Mamm. i. pi. 15 

 (1819). 



Hab. West Africa : Cameroons (Mus. Lugd.). 



The Mona is easily recognized by the white patch on the thighs, 

 on each side of the tail, and the white band on the forehead. It 



