774 INDEX. 



seasons, 886; reasoning powers of, 85; male, devoured by females,, 

 881. 



Pike, L. O.. on the psychical elements of religion, 108. 



Pimtlia striata, sounds produced by the female, 347. 



Pinel, hairiness iu idiots, 41. 



Pintail, drake, plumage of, 446; pairing with a wild duck, 471; 

 duck, pairing with a widgeon, 471. 



Pipe-fish, filamentous, 590; marsupial receptacles of the male. 392. 



Pipits, moulting of the, 444. 



Pipra. modified secondary wing-feathers of the male, 429: pipra 

 idiciuxa, 429, 480. 



Pirutts istridulas, stridulation of, 319. 



P:tcuirn Island, hall'- breeds on, 217. 



Piihecia leucocepluda, sexual differences of color in, 613; pithecia 

 sataiKis. beard of, 007: resemblance of. to a negro. C90. 



Pits, suborbital, of Ruminants, 601. 



Pittida?, uidificatiou of, 516. 



Placentata, 179. 



Plagiostomous fishes, 375. 



Plain- wanderer, Australian, 542. 



Piano-rice, bright colors of some. 295. 



Plantain-eaters, colors and nidification of the, 518; both sexes of, 

 equally brilliant, 523. 



Plants, cultivated, more fertile than wild. 50: Nageli, on natural 

 selection in, 68; male fiowers of, mature before the female. 240; 

 phenomena of fertilization in. 251. 



Platalea. 425. change of plumage in, 525. 



Platyblemnus, 328. 



Platycercus, young of, 549. 



Platyphyllum concacum, 321, 324. 



Platyrrhine monkeys, 174. 



Ptatyama my aides. 14. 



Ple.coatomus, head-tentacles of the males of a species of, 384; 

 plecostomas barbatus, peculiar beard of the male, 383. 



Plectropterus gambensis, spurred wings of, 414 



Ploceus, 420, 426, 460. 



Plovers, wing-spurs of, 414, double moult in, 442, 444. 



Plumage, changes of, inheritance of, by fowls, 259: tendency to 

 analogous variation in, 438; display of, by male birds, 447. 455,' 

 changes of, in relation to season, 526; immature, of birds, 529, 530; 

 color of, in relation to protection. 556. 



Plumes on the head in birds, differences of, in the sexes, 513, 



Pneumora, structure of, 325. 



Podica, sexual difference in the color of the irides of. 483, 



Poeppig, on the contact of civilized and savage races, 208. 



Poison, avoidance of, by animals, 90. 



Poisonous fruits and herbs avoided by animals. 75. 



Poisons, immunity from, correlated with color. 220. 



Polish fowls, origin of the crest in, 261. 



Pollen and van Dam, on the colors of Lemvr macaco. 613. 



Polyandry, 677; in certain Cyprinidse, 282; among the Elaterid, 



Polydactylisoi in man, 42. 



