92 



MR. R. I. POCOCK ON THE EXTERNAL 



and the better-known text-book names for the genera are put in 

 brackets : — 



CalUmico goeldii Thos. ; ad., from the Ma River, Bolivia. 

 Callicehus {Callithrix) moloch Hoffm. (?); two immature 

 ,, versonatus ; several adults of both sexes (Prof. J. P. 

 Hill).^ 



Saimiris {Chrysothrix) schireus Linn. ; and $ ad. 

 Cacajao {Brachijuriis^ 0 imkaria) ruhicundiis Geoffr. ; $ ad. 

 Aotus {Nyctipithecus) trivirgatus (?) ; 2 ad. 

 Ceb'us alhifrons (?) and ajjella{^. \ ; ^-^ , $ immature. 

 LagothrLv lagoU^icha ( = humholdti); 2 ad,: and L. infumata ; 

 S immature. 



Ateles ater Linn. ; S immature: and an immature c5" partaking 

 of the characters of two or three alleged species. 



Alouatta [Mycetes) villosa Gray (?) ; 5 immature, so named 

 from Elliot because the immature specimen was ail black. 



Text-figure L 



A. Nostrils oi Leontocehus rosalia. 



B. Callimico goeldii. 



C. „ Callicehus moloch. 



D. Cacajao rubicundus. 



E. Side view of muzzle of the same. 



F. Nostrils of Ateles. 



G. Side view of muzzle of the same. 



The Nostrils. 



Contrary to the current belief, all the South American Monkeys 

 are not, strictly speaking, Platyrhine. There is great variation 

 in the shape and situation of the nostrils. Typically both in the 



