NATURAL SCIENCES OP PHILADELPHIA. 



51S 



Mono zambo, native name. 



Icon. Guerin, Mag. de Zoologie, 1832, fig 1. 

 * S. Supra griseo-brunneus ; infra albidus macula frontali semilunar! aut 

 triangulari alba. 



Hab New Grenada. 



Body and tail light chocolate-brown, lighter upon head, neck, hands, and 

 external surface of limbs ; throat, belly, and internal surface of limbs grey ; 

 upon the forehead a triangular or semilunar white spot ; face naked and black ; 

 chin and lips sparsely covered with thick, short, white hairs. 



This species may be distinguished from the marginatus by the coloration. 

 The young of that species, even at birth, is similar in coloration to the adult; 

 the frontal spot is always white or grey, thus distinguishing it from the Geof- 

 froyii. Tbe name Mono zambo is stated by Isidore Geoffroy to signify Mulatto 

 Monkey, from its color being somewhat similar to that of the hybrids between 

 the Indians of Columbia and the negro. Skulls of the Aluatta palliatus, how- 

 ever, received from the Atrato expedition, are marked Mono zambo. 



Genus II. BRACHYTELES, Spix. 



Brachyteles, Spix, Sim. et Vesp., 1823, p. 36. 

 Eriodes, Is. Geoff., Mem. du Mus., 1829, p. 121. 



Corpus robustum ; cranium rotundum ; nares oblongae, antrorsum versae, 

 septo tenui separatse ; manibus tetra aut pentadactylis ; dentes primores 

 oequales, lanarii breves. 



Body heavy, facial angle about 60 s ; head more spherical than in the Sapa- 

 jous; nostrils circular, more inferior than lateral; anterior thumbs wanting, 

 or rudimentary, sometimes terminated by a small nail ; tail longer than body ; 

 incisors equal ; canines small, not exceeding the incisors in length ; molars 

 larger than incisors, quadrangular. Intermaxillaries articulating with nasal 

 banes by a broad surface. Hair woolly. 



I cannot agree with Isidore St. Hilaire that the description of this genus by 

 Spix is incorrect; the peculiar position of the nostrils, which resemble more 

 those of the Quadrumana of the Old World than any other of the American 

 genera, the equality in the size of the incisors, shortness of the canines, and 

 globular form of head appear to me sufficient generic distinctions. The length 

 of pelage, and the question whether it may be soyeux or laineux does not ap- 

 pear to me to be of generic value. 



Brachyteles arachnoides, Gray. 

 Ateles arachnoides, Geoff., Ann. du Mus., t. xiii. 1809, p. 89. 

 Ateles hypoxanthus, Desm., Mammalogie, 1820, p. 75. 

 Brachyteles macrotarsus, Spix, Sim. et Vesp., 1823, p. 36. 

 Eriodes tuberifer, hemidactylus. and arachnoides, Is. Geoff., Mem. du Mus.. 



t. xvii. 1828, pp. 160, 161,' 162. 

 Brachyteles arachnoides, Gray, Cat. of Brit. Mus., 1843, p. 10. 

 Mariki kupo and Macaco vernello. Native names. 



Icones, Ann. du Mus., vol. xiii. Pr. 9. Spix, Sim. et Vesp. 



T. 27. Maxde 



Wied., Abbild. zur Brazil, vol. i. T. 1. 

 B. Cinereo flavescens ; ad caudse basin ochraceus; facie nuda ; pollice aut 

 nulla, aut brevis; ungue carente aut praedita. 



1862.] 



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