SAIM [RI 311 



of its tributaries on both banks, into Colombia ; Santa Fe de Bogota, 

 (I. Geoff roy). 



Genl. Char. Posterior lobes of the brain overlap the cerebellum 

 by one fifth their length. (Huxley). 



Color. Face flesh color, covered with small white hairs ; lips 

 bluish black ; white superciliary streak extending over sides of head 

 to ears; head, arms above elbows, shoulders and legs gray with a 

 yellowish brown tinge ; back gray washed with golden yellow ; the dor- 

 sal region chestnut in some specimens, but always darker than the 

 rest of the back ; arms below elbows, hands and feet ochraceous ; under 

 parts yellowish white; inner side of limbs ochraceous yellow; tail 

 iron gray for three fourths its length, rest black ; ears white. 



Measurements. Total length, 694; tail, 384; foot, 78; ear, 28. 

 Skull : occipito-nasal length, 58 ; zygomatic width, 38 ; intertemporal 

 width, 30; palatal length, 15; width of braincase, 31 ; height of brain- 

 case over zygomata, 29; median length of nasals, 8; length of upper 

 molar series, 12 ; length of mandible, 34 ; length of lower molar series, 

 14 ; width of palate between canines, 10 ; between last molars, 12. 



Saimiei cassiquiaeensis (Humboldt). 



Chrysothri.v sciureus cassiquiarensis Humboldt, Rec. Obs. Zool., 



'l, 1811, (1815), p. 334. 

 Simia sciureus cassiquiarensis var. D. Less., Spec. Mamm., 1840, 



p. 160. 

 Saimiris lunulatus I. Geoff., Archiv. Mus. Hist. Nat-, Paris, IV, 

 1844, p. 18 ; Reichenb., Vollstand. Naturg. Affen, 1862, p. 16. 

 Chrysothrix nigrivittatus Wagn., Abhand. Bayer. Akad. Miinch., 



1844, p. 461. 

 Saimiri lunulatus Schleg., Mus. Pays-Bas, Simiae, 1876, p. 245. 

 Chrysothri.v sciurea (nee Linn.), Thos., Proc. Zool. Soc. Lond., 



"l880, p. 395. 

 Type locality. Banks of the Rio Cassiquiare, Venezuela. 

 Geogr. Distr. Banks of the Orinoco south of the Cataracts, to the 

 Rio Cassiquiare, and Rio Guaviare, and in the forests through which 

 the Rio Caura flows above the rapids of Mura, Venezuela, (Hum- 

 boldt). 



Color. Top of head and nape speckled buff and black ; line from 

 occiput passing above ears and curving downwards, black ; forehead, 

 face, nose, chin, throat, ears and sides of neck white ; dorsal region 

 red speckled with black ; arms to elbows, and legs to ankles dark gray ; 

 forearms, hands and feet ochraceous ; under parts and inner side of 



