GENERA AND SPECIES cxxv 



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Callithrix albicollis 231 



Callithrix pygmaea 232 



Callicebus 234 



Callicebus torquatus 239 



Callicebus amictus 240 



Callicebus ustofuscus 241 



Callicebus cupreus 242 



Callicebus calligatus 243 



Callicebus melanochir 244 



Callicebus paenulatus 245 



Callicebus egeria 246 



Callicebus leucometopa 246 



Callicebus subrufus 247 



Callicebus hoffmannsi 248 



Callicebus ornatus 248 



Callicebus remulus 249 



Callicebus donacophilus 249 



Callicebus emilise 250 



Callicebus pallescens 251 



Callicebus moloch 251 



Callicebus cinerascens 252 



Callicebus nigrifrons 254 



Callicebus gigot , 254 



Callicebus personatus 255 



Callicebus brunneus 257 



Alouatta 258 



Alouatta caraya 265 



Alouatta ululata 267 



Alouatta villosus 268 



Alouatta beelzebul 270 



Alouatta palliata , . 271 



Alouatta p. mexicana 272 



Alouatta p. coibensis 273 



Alouatta p. aequatorialis 274 



Alouatta ursina 274 



Alouatta seniculus 277 



Alouatta macconnelli 281 



Alouatta insulanus , 282 



Alouatta juara . 283 



Alouatta sara 283 



Pithecia 285 



Pithecia monacha 288 



Pithecia capillimentosa 291 



Pithecia albicans 292 



Pithecia pithecia 293 



