774 INDEX. 



seasons, 386; reasoning powers of, 85; male, devoured by females, 

 281. 



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



Pimelia striata, sounds produced by the female, S47. 



Pinel, hairiness in idiots, 41. 



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

 duck, pairing with a widgeon, 471. 



Pipe-fish, filamentous, 390; marsupial receptacles of the male, 392. 



Pipits, moulting of the, 444. 



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

 deliciosa, 429, 430. 



Pirates stridulus, stridulation of, 319. 



Pitcairn Island, half-breeds on, 217. 



Pithecia leucocepliala, sexual differences of color in, 613; pithecia 

 satanas, beard of, 607; resemblance of, to a negro, 690. 



Pits, suborbital, of Ruminants, 604. 



Pittidse, nidification of, 516. 



Placentata, 179. 



Plagiostomous fishes, 375. 



Plain- wanderer, Australian, 542. 



PlanaricB, 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; Niigeli, on natural 

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

 phenomena of fertilization in, 251. 



Platalea, 425; change of plumage in, 525. 



Platyblemnus, 328. 



Platycercus, young of, 549. 



Platyphyllam concavum, 321, 324. 



Platyrrhine monkeys, 174. 



Platysma myoides, 14. 



Plecostomus, head-tentacles of the males of a species of, 884; 

 plecostomus harhatus, peculiar beard of the male, 383. 



Pkctropterus gambends, 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 it, 

 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 Lemur macaco, 613. 



Polyandry, 677; in certain Cyprinidae, 282; among the Elateridse, 

 386. 



Polydactylism in man, 42. 



