312 SAIMIRI 



limbs yellowish white; tail like back at root, then iron gray for three 

 fourths the length, apical portion black. 



Measurements. About the size of S. sciureus. Skull: occipito- 

 nasal length, 60 ; zygomatic width, 37 ; intertemporal width, 32 ; median 

 length of nasals, 10; length of upper molar series, 18; length of 

 mandible, 15 ; length of lower molar series, 15. 



This species has been usually known as 5. lunulatus Geoff., but 

 this name is antedated by Humboldt's cassiquiarensis bestowed on it 

 thirty-three years previously. The whereabouts of the type does not 

 appear to be known. 



Humboldt states that this Squirrel Monkey is common south of 

 the cataracts of the Orinoco ; some are found there of a more slender 

 form and are very difficult to tame, and also on the banks of the 

 Guaviare River, and in the forests in which the Caura River flows 

 above the rapids of Mura. The smallest and prettiest of the Titis are 

 those of Cassiquiare. Schlegel says (1. c.) that an individual of this 

 species was brought to his notice, which was procured by a French 

 naturalist near the Oyapock, a river separating French from Portu- 

 guese Guiana. Spix, according to Wagner, obtained three examples 

 of this species, called by Wagner C. nigrivittatus ! at the junction of 

 the Teffe and Solimoens rivers near liga, but Spix does not mention 

 this monkey. 



Saimiei macrodon Elliot. 



Saimiri macrodon Elliot, Ann. Mag. Nat. Hist., XIX, 1907, 7th 

 Ser., p. 190. 



Type locality. Copataza River, Ecuador, Type in British 

 Museum. 



Geogr. Distr. Upper waters of the Amazon, Ecuador; and Rio 

 Jurua; Marcopata, Peru. 



Genl. Char. Similar to S. sciureus, but hands and feet much 

 darker. Skull has a much higher and narrower braincase ; much wider 

 palate, and larger teeth with the external line of the upper tooth row 

 much more curved ; zygomatic arch wider ; and intertemporal width, 

 greater ; bullae narrower and longer. 



Color. General color like S. sciureus with the back darker, that 

 of the type being tawny and black on the dorsal region, golden yellow 

 and black on the flanks ; arms above elbow dark gray washed with 

 yellow; legs paler; under parts yellowish white; arms from a short 



