obscura, Presbytis, ii. 123 obscurus, Semnopithecus, ii. 102, 123, 131, 255, 249 Theropithecus, i. 278 occidentalis, Colobus, ii. 98 Guereza, ii. 97 ochraceus, Cercopithecus, ii. 65 ocreatus, Macacus, ii. 12 ochrocephala, Pithecia, i. 185 Oedipus geoffroyi, i. 140 titi, i. 140 oedipus, Hapale, i. 140 Midas, i. 139, 140; ii. 254 Simia, i. 140 oerstedi, Chrysothrix, i. 158; ii. 254, 256 Saimiris, i. 158 olivaceus, Cebus, i. 210, 215 Colobus, ii. 87 Cynocephalus, i. 267 Gastrimargus, i. 222 Hapalemur, i. 81 Lagothrix, i. 222 Semnopithecus, ii. 87 Omomys, i. 117; ii. 226, 238 carteri, i. 117; ii. 252 opisthostictus, Cercopithecus, ii. 72 Opisthotomus, i. 123; ii. 227, 238, 252 Opolemur, i. 61; ii. 226, 237, 248 samati, i. 62 thomasi, i. 63 Orabassu Titi, i. 162 Orang-utan, ii. 170, 174 Orangs, ii. 143, 146, 148, 149, 167, 171, 183 ornata, Callithrix, i. 162; ii. 254 Ornate Titi, i. 162 ornatus, Ateles, i. 233, 234 Oreopithecus, ii. 212, 228, 240 bambolii, ii. 212 oseryi, Nyctipithecus, i. 170 Otogale crassicaudata, i. 47 kirki, i. 47 pallida, i. 43 Otolemur agisymbianus, i. 40 garnetti, i. 40 Otolicnus allenii, i. 43 apicalis, i. 43 crassicaudatus, i. 47 demidoffi, i. 45 galago, i. 42 garnetti, i. 40 peli, i. 44 senegalensis, i. 42 ouakary, Brachyurus, i. 175 Ouakaria, i. 174 calva, i. 178 melanocephala, i. 175 rubicunda, i. 176 spixii, i. 175 owenii, Pithecus, ii. 171