ii. 197

_Ictonyx_, ii. 199

_Ictops_, N. American Tertiary, i. 133

_Ideopsis_, ii. 470

_Idmais_, ii. 478

_Iguana_, ii. 401

Iguanas, ii. 400

IGUANIDÆ, ii. 400

_Ilerda_, ii. 477

_Ilicura_, ii. 102

India, Miocene fauna of, allied to that of Europe, i. 123 geological features of, i. 328

Indian sub-region, description of, i. 321 supposed relation to Ethiopian region, i. 321 mammalia of, i. 322 birds of, i. 323 reptiles and amphibia of, i. 326

_Indicator_, ii. 304

INDICATORIDÆ, ii. 304

Indo-Chinese sub-region, description of, i. 329 zoological characteristics of, i. 330 illustration of, i. 331 reptiles of, i. 331 amphibia of, i. 331 insects of, i. 332 islands belonging to, i. 333

Indo-Malayan sub-region, description of, i. 334 mammalia of, i. 336 illustrations of, i. 336, 339 birds of, i. 337 remote geographical relations of, i. 339 reptiles and amphibia of, i. 340 fishes of, i. 341 insects of, i. 341 coleoptera of, i. 342 terrestrial mollusca of, i. 343 zoological relations of islands of, i. 345 recent geographical changes in, i. 357 probable origin of fauna of, i. 359

_Inia_, ii. 209

_Insectivora_, European Miocene, i. 117 N. American Post-Pliocene, i. 129 N. American Tertiary, i. 133

Insectivora, classification of, i. 87 of the Palæarctic region, i. 181 of N. China and E. Thibet, i. 222 range of Palæarctic genera of, i. 239 of Madagascar, i. 273 range of Ethiopian genera of, i. 301 of the Oriental region, i. 315 range of Oriental genera of, i. 372 range of Australian genera of, i. 476

INSECTIVORA, ii. 186 general remarks on the distribution of, ii. 191 summary and conclusion, ii. 541

Insects, means of dispersal of, i. 32 tenacity of life of, i. 33 adapted to special conditions, i. 33 groups selected for the study of their geographical distribution, i. 102 antiquity of the genera of, i. 166 fossil of European Miocene, i. 166 European Cretaceous, i. 167 European Wealden, i. 167 Palæozoic, i. 168 Palæarctic, i. 187 of Central Europe, i. 196 of the Mediterranean sub-region, i. 205 of the Siberian sub-region, i. 220 of the Manchurian sub-region, i. 227 of the Ethiopian region, i. 255 of the E. African sub-region, i. 260 of W. African, i. 265 S. African, i. 268 of Madagascar, i. 282 general remarks on, i. 284 of tropical Africa and America, probable cause of similarities in, i. 291 of Indo-Chinese sub-region, i. 332 of the Oriental region, i. 318 of Ceylon, i. 327 of Indo-Malay sub-region, i. 341 statistics of collecting in the various islands of the Malay Archipelago, i. 343 of the Australian region, i. 403 of New Guinea, i. 417 of the Moluccas, i. 420 of the Timor group, i. 426 of Celebes, i. 454 of New Zealand, i. 458 scarcity of, in New Zealand, i. 462 influence of, on the flora, i. 463 of the Neotropical region, ii. 13 of S. Temperate America, ii. 42 of S. Temperate America, Palæarctic affinity of, ii. 45 of the Mexican sub-region, ii. 55 of the Antilles, ii. 73 of the Nearctic region, ii. 122 of Canada, ii. 137 distribution of, ii. 468 range of, in time, ii. 469 summary and conclusion, ii. 550 lines of migration of, ii. 551

_Iodopleura_, ii. 102

_Iolæma_, ii. 107

_Iolaus_, ii. 477

_Iole_, ii. 267

_Iora_, ii. 267

_Iphias_, ii. 478