768 INDEX. 



Nidification, of fishes, 391; relation of, to color, 515, 519; of 

 British birds, 517. 



Night-heron, cries of the, 417. 



Nightingale, arrival of the male before the female, 240; object of 

 the song of the, 418. 



Nightingales, new mates found by, 463. 



Nightjar, selection of a mate by the female, 473; Australian, sexes 

 of, 546; coloration of the 559. 



Nightjars, noise made by some male, with their wings, 426; elon- 

 gated feathers in, 436, 457. 



Nilghau, sexual differences of color in the, 611. 



Nillson, Prof., on the resemblance of stone arrow-heads from 

 various places, 203; on the development of the horns in the rein- 

 deer, 265. 



Nipples, absence of, in Monotremata, 184. 



Nitsche, Dr., ear of fetal orang, 18. 



Nitzsch, C. L., on the down of birds, 442. 



Noctuae, brightly colored beneath, 357. 



Noctuidae, coloration of, 355. 



Nomadic habits, unfavorable to human progress, 150. 



Nordmann, A., on Tetrao urogalloides, 460. 



Norfolk Island, half-breeds on, 217. 



Norway, numerical proportion of male and female births in, 275. 



Nose, resemblance of, in man and the apes, 174; piercing and 

 ornamentation of the, 656; very fiat, not admired in negroes, 664; 

 flattening of the, 665. 



Nott and Gliddon, on the features of Ramesis II, 192; on the 

 features of Amunoph III, 192; on skulls from Brazilian caves, 192; 

 on the immunity of negroes and mulattoes from yellow fever, 

 220; on the deformation of the skull among American tribes, 665. 



Nudibranch Mollusca, bright colors of, 296. 



Numerals, Roman, 163. 



Nunemaya, natives of, bearded, 639. 



Nuthatch, of Japan, intelligence of, 466; Indian, 555. 



Obedience, value of, 147. 



Observation, powers of, possessed by birds, 467. 



Occupations, sometimes a cause of diminished stature, 34; effect 

 of, upon the proportions of the body, 34. 



Ocelli, absence of, in female Mutillidae, 311; of birds, formation 

 and variability of the, 486. 



Ocelot, sexual differences in the coloring of the, 610. 



OcypJiaps lophote8,4:56. 



Odonata, 287. 



Odonestis potatoria, sexual difference of color in, 358. 



Odor, correlation of, with color of skin, 225; of moths, 349; 

 emitted by snakes in the breeding-season, 399; of mammals, 603. 



(Ecanthus nivalis, difference of color in the sexes of, 328; cecanthus 

 pellucid us, 328. 



Ogle, Dr. W., relation between color and power of smell, 19. 



Oidemia, 559. 



Olivier, on sounds produced by Pimelia striata, 347. 



Omaloplia hrunnea, stridulation of, 344. 



Onitis furcifer, processes of anterior femora of the male, and on 

 the head and thorax of the female, 337, 338, 



