240 C ALLICEBV S 



Hist. Nat. Mamm., 1828, p. 19; Wagn., Schreb., Saugtli. 

 Suppl., I, 1840, p. 234; V, 1855, p. 119; Tschudi, Faun. 

 Peruan., 1846, p. 47; Wallace, Proc. Zool. Soc. Lond., 1852, 

 pp. 107-109; Reichenb., Vollstand. Naturg. Affen, 1862, p. 22, 

 no fig. ; Gray, Cat. Monkeys, Lemurs and Fruit-eating Bats, 

 Brit. Mus., 1870, p. 55 ; Schleg., Mus. Pays-Bas, Simise, 1876, 

 p. 235 ; von Pelz., Bras. Saugth., 1833, p. 20 ; Forbes, Handb. 

 Primates, I, 1894, p. 159. 



Callithrix lugens E. Geoff., Ann. Mus. Hist. Nat. Paris, XIX, 

 1812, p. 113; Kuhl, Beitr. Zool., 1820, p. 89; Desm., Mamqi., 

 1820, p. 87 ; E. Geoff., Cours Hist. Nat. Mamm., 1828, p. 18, 

 lOme Legon ; Reichenb., Vollstand. Naturg. Affen, 862, p. 22, 

 no fig. 



Sanguinus vidua Less., Spec. Mamm., 1840, p. 166; Id. Nouv. Tab. 

 Reg. Anim., 1842, p. 8. 



WHITE-COLLARED TITI MONKEY. 



Type locality. Right bank of the River Tocantins near its mouth. 



Geogr. Distr. River Tocantins; mountains on right bank of the 

 Orinoco, near Mission of Santa Barbara ; the forests near the Rio 

 Cassiquiare and the Rio Guaviare near St. Fernando de Atabapo : 

 upper reaches of the Rio Negro ; forest of Oliven^a on the right bank 

 of the Rio Solimoens; Southern Peru, (Tschudi). 



Genl. Char. Fur long, soft, v^fooUy ; ears short, nearly naked. 



Color. Face naked, or with a few short white hairs on lips and 

 cheeks ; forehead, sides of head in front of ears, limbs, feet and tail 

 black ; upper parts dark maroon ; under parts paler with the throat 

 white, this hue extending as a kind of collar up to the ears; hands 

 yellowish white. 



Measurements. Totallength, 800; tail, 475. Skull : intertemporal 

 width, 35 ; breadth of braincase, 39 ; palatal length, 18 ; median length 

 of nasals, 15 ; length of upper molar series, 16; length of mandible, 43 ; 

 length of lower molar series, 18. 



Callicebus amictus *(E. GeofFroy). 



Callithrix amictus E. Geoff., Ann. Mus. Hist. Nat. Paris, XIX, 

 1812, p. 114; Id. Cours Hist. Nat. Mamm., 1828, p. 18, lOme 

 Legon; Kuhl, Beitr. Zool., 1820, p. 39; Desm., Mamm., 1820, 

 p. 8; Wagn., Schreb., Saugth. Suppl., I, 1840, p. 234; V, 



*"Espcce inedite," E. Geoffroy. This Author and Humboldt must have 

 seen each other's MSS. as each cites the other's article on the Monkeys, 

 although these were published some years apart. 



