_Orpheus Thenca_, 61 —— _melanotis_, 62 —— _trifasciatus_, 62 —— _Patagonicus_, 60 —— _modulator_, 60 —— _parvulus_, 63 —— _calandria_, 60 _Ortyx Falklandica_, 117 Otus Galapagoensis, 32 —— palustris, 33 _Oxyurus ornatus_, 81 —— dorso-maculatus, 82 —— tupinieri, 81 Pachyramphus albescens, 50 —— minimus, 51 Palmipedes, 134 _Parulus ruficeps_, 79 _Passerina discolor_, 107 —— jacarina, 92 —— _guttata_, 94 Passer Hispaniolensis, 95 —— Jagoensis, 95 _Patagon_, 113 _Pattagonian maccaw_, 113 —— _warbler_, 67 Pelecanoides Berardi, 138 —— Garnotii, 139 _Pelecanus carunculatus_, 145 —— _aquilus_, 146 _Pelidna cinclus_, 131 —— _minutilla_, 131 —— Schinzii, 131 _Le Pepoaza proprement dit_, 54 _Pepoaza variegata_, 55 —— _pyrope_, 55 —— _maritima_, 57 —— _gutturalis_, 56 —— _nivea_, 53 _Perdix Falklandica_, 117 _Perruche_, 112 _Perspicilla leucoptera_, 51 _Petit Bout-de-Petun_, 114 _Petrel échasse_, 141 _Phalacrocorax imperialis_, 145 —— carunculatus, 145 _Phalcobœnus montanus_, 19 Philomachus Cayanus, 127 _Phytotoma Bloxami_, 106 —— _rutila_, 106 —— _silens_, 106 —— rara, Anat. Descript. of, 153 —— rara, 106 _Picazuro_, 115 _Picus campestris_, 113 —— _Chilensis_, 114 —— Kingii, 113 —— _melanocephalus_, 113 _Pigeon rougeatre_, 116 Pipilo personata, 98 Pitylus superciliaris, 97 _Platyurus niger_, 74 Podiceps kalipareus, 136 —— Rollandii, 137 —— Chilensis, 137 Pœcilonitta Bahamensis, 135 Polyborinæ, 9 _Polyborus Galapagoensis_, 23 —— _chimango_, 14 —— Brasiliensis, 9 —— _vulgaris_, 9 —— _albogularis_, 18 —— _chimachima_, 13 Porphyrio simplex, 133 Prion vittatus, 141 _Procellaria oceanica_, 141 —— _Capensis_, 140 —— _Berardi_, 138 —— _vittata_, 141 —— _urinatrix_, 139 —— gigantea, 139 —— glacialoïdes, 140 —— _puffinus_, 137 Progne purpurea, 38 —— modesta, 39 _Psarocolius sericeus_, 107 —— _anticus_, 107 —— _chrysopterus_, 106 —— _flaviceps_, 107 _Psittacara Patachonica_, 113 _Psittacus Patagonus_, 113 —— _murinus_, 112 Pteroptochos albicollis, 72 —— albicollis, Anat. Descript. of, 151 —— Tarnii, 70 —— Tarnii, Anat. Descript. of, 150 —— rubecula, 73 —— megapodius, 71 —— paradoxus, 73 _Ptiloleptus cristatus_, 114 _Puffinuria Berardi_, 138 —— _Garnotii_, 139 Puffinus cinereus, 137 Pyrocephalus, 44 —— parvirostris, 44 —— obscurus, 45 —— nanus, 45 —— dubius, 46 _Pyrgita Jagoensis_, 95 Pyrrhalauda nigriceps, 87 Pyrrhulinæ, 88 Querquedula creccoïdes, 135 —— erythrorhyncha, 135 Rallus Philippensis, 133 —— ypecaha, 133 —— sanguinolentus, 133 _Recurvirostra himantopus_, 130 _Regulus omnicolor_, 86 —— _Byronensis_, 86 Rhea Americana, 120 —— Darwinii, 123 Rhinomya lanceolata, 70 Rhynchaspis maculatus, 135 Rhynchæa semicollaris, 131 —— _Hilairea_, 131 —— _occidentalis_, 131 Rhynchops nigra, 143