512 



PROCEEDINGS OF THE ACADEMY OF 



posing which are directed superiorly ; hairs of occiput long and black; cheeks 

 covered with short white hair; behind and beneath cheeks, two pencils of long 

 black hairs directed anteriorly. 



Female and young male, coloration generally lighter than in male, the black 

 of the back and limbs being replaced by a brown of greater or less intensity, 

 according to the age of the specimen ; triangular spot upon the forehead black, 

 the hairs composing it being yellow at their bases and black throughout the 

 remainder of their length ; elbows and feet black. 



Young, yellowish, dashed with brown, frontal spot as in female, or with the 

 hairs black to the root. 



By means of a fine suite of specimens, in the collections of the Academy and 

 Smithsonian Institution, I have been enabled to study with care this most 

 curious species. Though varying greatly in coloration it may always be re- 

 cognized by the triangular frontal spot. 



I have examined the skull of a female corresponding in coloration to Dr. 

 Gray's Brachyteles fronlatus, and find it decidedly that of a Sapajou, the distance 

 between the intermaxillaries and nasal bones being one-tenth of an inch. 



The only specimen I have met with from a well authenticated locality is one 

 collected by the Paraguay expedition (Sm. Inst. No. 3252), in Bolivia. Speci- 

 mens in the collection of the Academy are marked Brazil, but as they were 

 purchased of a dealer, little reliance can be placed upon it. Dr. Gray's type is 

 marked Tropical America, and no locality is given for any specimen in the 

 Paris museum, all being "De la Menagerie." 



Skull of No. 3232, occiput broken* Antro posterior?; occipito frontal?; 

 bi-temporal 2-35; bi-parietal 2-4; facial angle 56 ; cranial capacity ?. 



Lower Jaxo. Angle to symphysis 2-8; angle to condyle 1 5 ; angle to coro- 

 noid process 1-7 ; posterior molar to coronoid process 1*25. 



Sapajou makginatus. 



Ateles marginatus, Geoff., Ann. du Mus., vol. xiii., 1809, p. 92. 

 Ateles frontatus, Bennett, Proc. Zool. Soc, 1830, p. 38. 

 Ateles albifrons, Schinz., Synopsis, vol. i., 1844, p. 63. 

 Chuva, Humboldt. 

 Icon. Ann. du Mus., vol. xiii., T. 9. 



S. niger ; pilis faciem cingintibus partim albis ; sincipite albo. 



Sab. Brazil, Grand Para. 



General color black ; belly and internal surface of limbs ashy-grey ; face 

 naked, flesh-colored in the occular region, the remainder black; forehead, 

 sinciput and a spot on each side of nose white or grey. 



Humboldt found this species quite abundant in the province of Jaen de Bra- 

 camotos ; he describes its disposition as fierce and libidinous. 



Sapajou hybridus. 

 Ateles hybridus, Is. Geoff., Mem. du Mus., vol. xvii., 1828, p. 168. 



* This skull presents the anomaly of a well developed seventh molar in the left superior max- 

 illary ; such anomalies are not unfrequently met with among the Quadrumana. 1 recollect ex- 

 amining at the Magazin of Virreaux fieres, paiif, a skull of the Simia satyrus having on each 

 side ot the lower jaw t-ix well denned molars. 



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ov. 



