Vol. XXVIII, pp. 101-102 April 13, 1915 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



A NEW SPIDER MONKEY FROM PANAMA. 

 BY E. A. GOLDMAN. 



In determining the collection of mammals made in the course 

 of the Smithsonian Biological Survey of the Panama Canal 

 zone (1911-1912), a black spider monkey obtained in the east- 

 ern part of Panama was provisionally referred to Ateles ater 

 F. Cuvier of Guiana, a species first recorded from Panama by 

 Sclater.* More recent comparisons, however, with material 

 from various sources including the type and a topotype of 

 Ateles rohustus Allen from western Colombia, kindly loaned l)y 

 Dr. J. A. Allen of the American Museum of Natural History, 

 indicate that the specimen represents a new form described 

 below. 



Atele.s dariensis sp. nov. 



DARIEN BLACK SPIDER MONKEY. 



Type from near head of Rio Limon (altitude 5200 feet). Mount Pirri, 

 eastern Panama. No. 179,044, female adult (teeth slightly worn), U. S. 

 National Museum (Biological Survey Collection), collected by E. A. 

 Goldman, April 29, 1912. Original number 21,664. 



General characters. — A rather small long-tailed black spider monkey of 

 the Ateles ater group. Similar in total length to Ateles robustus of west- 

 ern Colombia, but tail longer and head and body correspondingly shorter 

 (tail nearly twice as long as head and body, instead of only a little longer 

 as in A. robustus); skull differing especially in the greater posterior 

 extension of the palate, and the peculiar flattened condition of the audital 

 bullae. Apparently diflering from A. ater in relatively longer tail, 

 smaller general size, and in cranial details. 



Color. — Face and entire pelage uniform deep glossy black, except a few 

 whitish hairs on the middle of the forehead and about the mouth. 



Skull. — Similar to that of A. robustus, but smaller, the frontal region 

 more elongated anteriorly; zygomatic portion of jugal more expanded 



• Proc. Zool. Soc. Lond., 1872. p. 5. 



16— Proc. Biol. Soc. Wash., Vol. XXVIII, 1915. (101) 



