92 



MR. 11. I. POCOCK ON THE EXTERNAL 



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

 bi-ackets : — 



OaUimico goeldii Thos. ; S ^^d., from the Ma River, Bolivia. 

 Callicehus (Ccdlithrix) onoloch Hoffm. (?) ; two immature $. 

 „ versonatus ; sevei'al adults of both sexes (Prof. J. P. 



Hill).' 

 Saimiris {Chrysothrix) sciureus Linn. ; c? and 5 ad. 

 Cacajao {Brachyurits, Oiiaharia) ruhicundtis Geoffr. ; $ ad. 

 Aotus {JSfycti'pithecus) trivirgatus i^T) \ $ ad. 

 Gehus cdhifrons (?) and apellaC?) ; rC , $ immature. 

 LagothrLi: lagotricha { = humboldti) ; $ ad.: and L. infumata ; 



S immature. 

 Ateles ater Linn. ; J immature: and an immature S partaking 



of the characters of two or tliree alleged species. 

 AJoicatta (Mycetes) villosa Gra,y (?) ; 5 immature, so named 



from Elliot because the immature specimen was all black. 



Text-figure 1, 



f) ( 



A. Nostrils of Leontocehus rosalia. 



B. „ CaUimico 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. 



X*. 



IVie 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 



A 



