NO. 2333. MAMMALIA COLLECTED IN PERU BY HELLER— THOMAS. 221 



[CEBUS AZARAE PALLIDUS Gray.] 



[Three males and one female, Nos. 97.10.3.4r-7, B. M., Idma, Santa 

 Ana, Cuzco. J. Kalinowski.] 



The association with azarae is accepted on the a uthority of Doctor 

 Elliot.^ I had already referred the specimens to Gray's pallidus. 



4. LAGOTHRIX THOMASI Elliot. 



Young male. No. 194343, Eio Comberciato (2,000 feet). 



[Female, No. 98.11.6.2, B. M., Callanga, Cuzco (5,000 feet). O. 

 Oarlepp. Type.] 



No. 194343 of the present collection is quite young, so that it can 

 not be determined with any certainty. It may perhaps be referable 

 to the Cuzco form described by Doctor Elliot as L. thomasi. 



5. SAIMIRI BOLIVIENSIS NIGRICEPS Thomas. 



Three males and one female, Nos. 194344-7, Kio Comberciato (2,000 

 feet). 



These specimens, and others recently received, confirm Doctor 

 Elliot's observation that nigHce'ps may be distinguished from holi- 

 viensis by the deeper and more golden orange color of the forearms 

 and feet, the tone in holiviensis being more yellowish. On the other 

 hand, the intensity of the blackness of the cap, on which I primarily 

 distinguished the^ subspecies, proves to be subject to considerable 

 change with age, the older specimens having this a deeper black than 

 the younger. Besides the type from Cosnipata, examples o^f nigri- 

 ceps are in the British Museum collection from Marcapata (Kalinow- 

 ski) and Tahua Manu Eiver (Maj. H. S. Toppin). 



6. LEONTOCEBUS PURILLUS Thomas. 



Four specimens as follows : 



Rio Cosireni, 3,000 feet, male and female, Nos. 194331, 194334. 



Rio San Miguel, 4,.500 feet, male and female, Nos. 194335-6. 



These four specimens agree remarkably well with the type of L. 

 'pmillus, which came from the Acre Eiver, Upper Purus Eiver, some 

 200 miles northeast of the present locality. 



In the description, which was based on a single specimen that had 

 been in confinement, emphasis was laid on the amount of ferruginous 

 at the base of the tail, and on the buffy suffusion of the dorsal mar- 

 bling; but both these characters prove to be variable on the evidence 

 of Mr. Heller's specimens. On the other hand, the latter show one 

 very well marked characteristic of the species which was not readily 

 perceptible on the menagerie-soiled type— namely the white V-shaped 

 frontal patch, extending the white of the muzzle backwards on each 



1 Primates, vol. 2, p. 108. 



