ONTHOPHAGUS. 



INDEX 



0\vp;n. 



66s 



femora of the male, and on the 

 head and thorax of the female, 

 297. 



Onthophagus, 295. 



rangifer, sexual differences of, 



296 ; variation in the horns of the 

 male, 297. 



Ophidia, sexual differences of, 351. 



Ophidium, 347. 



Opossum, wide range of, in America, 

 169. 



Optic nerve, atrophy of the, caused 

 oy destruction of the eye, 32. 



Orang-Outan, 561 ; Bischoff on the 

 agreement of the brain of the, 

 with that of man, 6 ; adult age 

 of the, 8 ; ears of the, 1-i ; ver- 

 miform appendage of, 21 ; hands 

 of the, 50 ; absence of mastoid pro- 

 cesses in the, 53 ; platforms built 

 by the, 66 ; alarmed at the sight of 

 a turtle, 72 ; using a stick as a 

 lever, 81 ; using missiles, 81 ; using 

 the leaves of the Pandanus as a 

 night covering, 82 ; direction of 

 the hair on the arms of the, 151 ; 

 its aberrant characters, 154 ; sup- 

 posed evolution of the, 177 ; voice 

 of the, 527 ; monogamous habits 

 of the, 590 ; male, beard of the, 

 531. 



Oranges, treatment of, by monkeys, 

 50. 



Orange-tip butterfly, 308, 312, 313. 



Orchestia Darwinii, dimorphism of 

 males of, 268. 



— — Tucuratinga, limbs of, 267, 271. 



Ordeal, ti'ial by, 96. 



Oreas canna, colours of, 535. 



Derbianus, colours of, 535, 543. 



Organs, pi*ehensile, 209 ; utilised for 

 new purposes, 571. 



Organic scale, von Baer's definition of 

 progress in, 164. 



Orioles, nidification of, 453. 



Oriolus, species of, breeding in im- 

 mature plumage, 484. 



— •— r melanocephalus, coloration of the 

 sexes in, 460. 



Ornaments, prevalence of similar, 

 179; of male birds, 367; fondness 

 of savages for, 574. 



Ornamental characters, equal trans- 

 mission of, to both sexes, in mam- 

 mals, 541 ; of monkeys, 549. 



Ornithoptera crcesus, 250. 



Ornithorhynchus, 156 ; reptilian ten- 

 dency of, 159 ; spur of the male, 

 502. 



Orocetes erythrogastra, young of, 487. 



Orrony, Grotto of, 22. 



Orsodacna atra, difference of colour ia 

 the sexes of, 294. 



Orthoptera, 282 ; metamoa-phosis of, 

 237 ; stridulating apparatus of, 

 283, 288; colours of, 289; rudi- 

 mentary stridulating organs in 

 female, 288 ; stridulation of the, 

 and Homoptera, discussed, 288. 



Ortygornis gularis, pugnacity of the 

 male, 363. 



Oryctes, stridulation of, 303 ; sexual 

 differences in the stridulant organs 

 of, 305. 



Oryx leucoryx, use of the horns of, 

 509, 518. 



Osphrantet- rufus, sexual difference in 

 the colour of, 533. 



Ostrich, African, sexes and incuba- 

 tion of the, 478. 



Ostriches, stripes of young, 464. 



Otaria jubata, mane of the male, 

 521. 



nigrescens, difference in the 



coloration of the sexes of, 534. 



Otis be?igalensis, love-antics of the 

 male, 380. 



tarda, throat-pouch of the male, 



373 ; polygamous, 219. 



Ouzel, ring-, colours and nidification 

 of the, 455. 



, water-, colours and nidifica- 

 tion of the, 455. 



Ovibos moschatus, horns of, 505. 



Ovipositor of insects, 208. 



Ovis cydoceros, mode of fighting of, 

 508, 513. 



Ovule of man, 9. 



Owen, Prof., on the Corpora Wolf- 

 fiana, 11 ; on the great toe in man, 

 11; on ""the nictitating membrane 

 and semilunar fold, 17 ; on the 

 development of the posterior mo- 

 lars in different races of man, 20 ; 

 on the length of the ccecum in the 

 Koala, 20 ; on the coccygeal ver- 

 tebrae, 23 ; on rudimentary struc- 

 tures belonging to the reproductive 

 system, 24 ; on abnormal condi- 

 tions of the human uterus, 38, 



