ATELEUS 43 



of Atelcs were seen in the forest from an elevation of 7.000 feet to 

 as low as 2,500 feet, on the outskirts of the coffee plantations of San 

 Augustin. So far as Mr. Salvin could see with his glass, these 

 ]\Ionkeys showed no variation in color, being dark above and light 

 beneath ; but the trees in which they were found were very lofty, 

 and the foliage so dense as to make it difficult to observe them 

 accurately." 



At Mirador, near Mount Orizaba, State of \'era Cruz, Professor 

 Liebmann found this species common, going in small troops in the deep 

 ravines up to an elevation of 2,000 feet. In eastern Oaxaca he also 

 found it at a height of 4,000 feet. He believed it does not go on the 

 Pacific slope of the mountains nor farther north than Tehuantepec. 



Ateleus fusciceps Gray. 



Ateles (!) fusciceps Gray, Proc. Zool. Soc. Lond., 1865, p. 7?i2>; 

 Id. Cat. Monkeys, Lemurs and Fruit-eating Bats, Brit. Mus., 

 1870, p. 42; Sclat., Proc. Zool Soc. Lond, 1872, p. 663, pi. 

 LV; Schleg., I\Ius. Pays-Bas, Simise, 1876, p. 173; Forbes, 

 Handb. Primates, I, 1894, p. 242. 



BROWN-HEADED SPIDER MONKEY. 



Type locality. Unknown. Type in British Museum. 



Geogr. Distr. Trans-Andean Ecuador. Range unknown. 



Genl. Char. Thumb absent. 



Color. Top of head yellowish wood brown darkening to a line of 

 mummy brown above the forehead ; upper parts and limbs black tinged 

 with burnt umber brown, the tips of the hairs being of that color ; 

 hands, feet and tail, black ; under parts blackish brown. Ex type 

 British Museum. 



Measurements. Skull: total length, 114; occipito-nasal length, 

 102; zygomatic width, 71 ; intertemporal width, 52; palatal length, 33; 

 breadth of braincase, 62 ; median length of nasals, 21 ; length of upper 

 molar series, 24 ; length of mandible, 72 ; length of lower molar series, 

 29. Ex type British Museum. 



The type of this species, a skin in the Collection of the British 

 Museum, was obtained from the Zoological Society, the animal having 

 been received alive, patria unknown, and died in the gardens. Subse- 

 quently other specimens were procured by Mr. Buckley in Ecuador, 

 locality not given. It is apparently quite a distinct form, the peculiar 

 coloring of the top of the head making it easily recognizable. 



