30 ATELEUS 



siderable cunning in pilfering small articles of clothing which it conceals 

 in its sleeping place. 



Ateleus ater F. Cuvier. 



Ateles ( !) ater F. Cuv., Hist. Nat. Mamm., I, 1823, Liv. XXXIV, 

 2nd ed., 1833, p. 157, pi. LIII ; Less., Spec. Mamm., 1840, 

 p. 128; I. Geoff., Cat. Primates, 1851, p. 48; Wallace, Proc. 

 Zool. Soc. Lond., 1852, p. 108; Wagn., Schreb., Saugth. 

 Suppl., V, 1855, p. 71, pi. XXXVI A; Dahlb., Stud. Zool. 

 Fam. Reg. Anim. Natur., fasc. I, 1856, pp. 171, 172; 

 Reichenb., Vollstand. Naturg. Affen, 1862, p. 59, figs. 643, 

 644; Gray, Cat. Monkeys, Lemurs and Fruit-eating Bats, 

 Brit. Mus., 1870, p. 42; Bartl., Proc. Zool. Soc. Lond., 1871, 

 p. 218 ; Sclat., Proc. Zool. Soc. Lond., 1872, p. 5 ; Schleg., Mus. 

 Pays-Bas, Simise, 1876, p. 170; Alston, Biol. Centr. Amer., I, 

 Mamm., 1879, p. 7; Anders., Cat. Mamm. Ind. Mus. Calc, 

 1881, p. 83 ; Forbes, Handb. Primates, I, 1894, p. 241 ; Elliot, 

 Mamm. Middle Amer. and West Ind., Pub. Field Columb, 

 Mus., IV, Pt. II, 1904, p. 734, Zool. Ser. ; Id. Cat. Mamm. 

 Field Columb. Mus., VI, 1905, Zool. Ser. ; Allen, Bull. Am. 

 Mus. Nat. Hist., N. Y., XXXI, 1912, p. 95. 



Cebus ater Fisch., Syn. Mamm., 1829, p. 40. 



Sapajou ater Slack, Proc. Acad. Nat. Scien. Phil., 1862, p. 510. 



BLACK SPIDER MONKEY. 



Type locality. Cayenne, French Guiana. Type in Paris Museum. 



Geogr. Distr. Panama ; French Guiana ; Rio Sinu Cerete, Bolivar ; 

 Colombia, and Eastern Peru. Banks of Rio Ucayali, Rio Chamicurus 

 and Rio Huallaga, ( Bartl ett). 



Genl. Char. Face black. Thumb absent. 



Color. Like A. paniscus, entirely black, face black. 



Measurements. Skull: total length, 119; occipito-nasal length, 

 102 ; Hensel, 80 ; zygomatic width, 73 ; intertemporal width, 48 ; palatal 

 length, 35 ; breadth of braincase, 64 ; median length of nasals, 20 ; 

 length of upper molar series, 25 ; length of mandible, 29.5 ; length of 

 lower molar series, 29. 



The only difference in the outward appearance between A. ater 

 and A. paniscus, is in the coloring of the face, that of the present 

 species being all black while that of A. paniscus is flesh colored. 



Wallace states (1. c.) that, "these monkeys are slow in their 

 motions, but make great use of their prehensile tails, by which they 

 swing themselves from bough to bough ; and I have been informed that 



