5. CEBUS. 47 



C. M0NACHU8, F. Cuv. Mamm. Lith. t. 76, p. 31. C. (mnthoster- 

 nus, Pr. Max. C. a'anthoccphala, Spix. 



** Lumhar vertehrm 6. Head small. 



C. CAPUCiNus. (Old) C. /rrv!?s, Geoff. (Vox.) C. fuhnis,Dcsm. G. 

 (jraciUx, Spix. C. clirysopus, F. Cuv. S. aJh'ifrom, Humboldt. 

 C nigro-vittatus, Natterer. 



C. ciRBiFEE, Pr. Max. C. niger, Geoff. ; Buff. Supp. vii. t. 28- 

 C. cristatus, F. Cuv. 



C. HYPOLEUcus, Geoff. ; Buffon, v. t. 9. 



There arc many skulls of this genus in the Museum from very 

 differently coloured specimens. The adult ones are very much 

 alike in size, external form, and in dentition, offering no important 

 characters by which they can be divided into groups. (See Gray, 

 P. Z. S. 1865.) 



Dr. Dahlbom arranges the specimens in the Paris Museum in 

 his " Tabula Synoptica," p. 164, thus : — 



I. The hair of the crown erect, subfasciculate. — 1. C. rolustus; 



2. C. ehgans; 3. G. Pucheranii=G. cajnocinus, Geoff.; 4. 

 C. ehgans, var. 5. C. frontatus ; 6. G. cirrifer ; 7. G. vel- 

 lerosus, 



II. Hail' of the crown adprcssed. 



a. The beard of the cheek and throat very diffused. — 8. G. har- 



batus ; 9, C. variegatus. 



b. Beard of cheek and throat less prominent; crown defined 



with a pale edge. — 10. G.flavus; 11. G. Ajjella. 



c. Check, chin, and throat hairy. — 12. C. capucinus ; 13. G. 



castaneus ; 14. G. versicolor ; 15. G. chrysoptis. 



In the compilation of Lesson, Wagner, and Giebel, who depended 

 upon the descriptions of authors, without ha^'ing the opportunity of 

 examining specimens to correct their theories, the species are mixed 

 together in a manner that is not confinned by reference to the 

 specimens themselves, showing how dangerous it is to venture in 

 such compilations to go beyond the authors considted. 



There seems to be a considerable difference in the length of the 

 toes of the stuffed specimens, and I considered it a good character ; 

 but I now suspect that it may depend on age (as the younger stuffed 

 specimens always appear to have longer fingers and toes than the 

 older ones), and perhaps more on the art of the preserver. 



The species may also be divided thus, by the colour of the fur : — 



The greater number of specimens have the front of the fore legs 

 and chest pale. 



I. Fur black or brownish-black. — G. leucogengs, G. cirrifer, G. 



vellerosus, G. leiicocephulus, G, hypoUucus. 



II. Fur yellow, or yellow-and-brown, or brown-and-ycllow 



