Prepotency, 136 Prickly pear, 274 Primrose, evening, 84, 85, 88 Pritchard, Hesketh, 359 “Proceedings of the Fourth International Ornithological Congress,” 288, 337 “Proceedings of the Linnæan Society,” 288 “Proceedings of the Natural History Society of Brunn,” 141 _Protohippus_, 37 _Pseudoclytia pentata_, 103 Pseudo-sematic colours, 173 _Pseudotantalus cinereus_, 282 Ptarmigan, 190 _Pteroclurus exustus_, 204 Puffin, 191 Pugnacity of animals, 206, 360 Puma, 45 Purple beech, 87 Pycraft, W. P., 277 _Pycnorhampus affinis_, 284 _P. icteroides_, 284 _Pygæra bucephala_, 215 Q Quail, 185 Quatrefages, de, 124 _Quelea quelea_, 98 _Q. russi_, 98 _Querquedula crecca_, 290 Quetelet’s Law, 77 R Rabbit, 99, 100, 105, 183, 253, 283, 350, 352 Racehorse, 69 Radicles, biological, 159 _Rallus aquaticus_, 251 _R. indicus_, 251 _Ranunculus bulbosus_, 70 _Rappia_, 245 Raspberry, 118 Rat, 74, 282 —— water, 101 Raven, 190 Razorbill, 190 Recessive characters, 142 Recognition colours, 251-7, 275 —— marks, 124 Red-mantled parakeet, 121 Redpole, 207 Redwing, 354 Reed bunting, 98 Reeves’ pheasant, 129 Regression, Law of, 82, 374 Reid, Archdale, 5 Reindeer, 190 Rest-harrow, 22 Reversion, 64, 65, 129, 293 _Rhinosciurus tupaioides_, 180 _Rhodocera rhamni_, 155 _Rhododendron ferrugineum_, 118 _R. hirsutum_, 118 _Rhynchæa_, 327 Ricardo, 28 Ringed finch, 104 Robin, 281, 378 Robin, Indian, 202 Robinson, Dr H., 171, 198 —— E. K., 261, 264, 265, 266, 268, 270, 272-4 Rodents, 67 Rogeron, 126 Roller, 123, 220, 255 Romanes, 366-81 Rook, 51, 187 Rose, 61, 267 Rosella parakeet, 121 Rous, Admiral, 69 Roux, 136 Ruff, 343