94 CEBUS 



on rump, rest of body fulvous or yellowish fulvous, becoming grayish 

 on shoulders, flanks, and hinder part of arms and thighs ; limbs yellow, 

 the legs strongly tinged with golden ; hands and feet yellowish brown ; 

 under parts yellowish gray, but most of the hair gone ; tail reddish buff 

 above, at base like rump but paler; beneath sooty gray. Albinistic 

 individual. Ex type Paris Museum. 



Measurements. Skull : Not the type. Occipito-nasal length, 88 ; 

 Hensel, 65 ; zygomatic width, 71 ; intertemporal width, 40 ; median 

 length of nasals, 10; length of upper molar series, 21; length of 

 mandible, 63 ; length of lower molar series, 25. 



The above describes Geoffrey's type as it is to-day, much faded 

 in color and soiled with dust. Originally it was probably of a general 

 golden yellow color, with a brown head, and tinged with red on rump 

 and back. The present gray hues are probably derived from the dust 

 that has settled upon the fur. 



The type of C. barbatiis Geoff., is also in the Paris Museum and 

 is referable to C. flavus. It is not quite so greatly faded on one side 

 of the body, and is of a general yellowish brown hue, the top of the 

 head being almost a cream color, and a slight golden shade on occiput 

 and neck; the hind limbs are somewhat darker than typical flavus, 

 but the differences perceptible after all these years, it has been in the 

 Museum since 1812, are only such as the variability of the species and 

 the deterioration of the specimen could easily produce. One side of 

 the type is paler than the other. The skulls unfortunately are in the 

 examples and no opportunity is therefore afforded for ascertaining if 

 any cranial differences exist. Mindful of the great variations existing 

 among nearly all the species of Cebus, uniting these specimens in one 

 species seems to be the proper course to pursue. 



Cebus castaneus I. GeofFroy. 



Cebus castaneus I. Geoff., Cat. Primates, 1851, p. 46; Wagn., 

 Schreb., Saugth. Suppl., V, 1855, p. 97; Dahlb., Stud. Zool. 

 Fam. Reg. Anim. Nat., fasc. I, 1856, pp. 164, 168. 

 Cebus apella (nee Linn.), Schleg., Mus. Pays-Bas, Simias, 1876, 



p. 199. 

 Type locality. Cayenne. Type one of two in Paris Museum. 

 Genl. Char. Size large, tail very long, black on crown a mere 

 stripe, greater part of forehead yellowish white. 



Color. Head yellowish white, triangular small black patch on 

 middle of crown, extending as a mere thread to the forehead ; above 

 ears and nape reddish chestnut; upper parts of body and hind limbs 



