Incongruence; in Lepidopterous families, 437; genera, 446, 449; species, 451; varieties, 456; two kinds of, 458, 502; in Hymenoptera, 481; in Diptera, 488; different forms of, 503; dependent upon action of environment, 505, 507, 508. Inheritance; homochronic, 63, 431; definition of cyclical, 66; limited by sex, 68. Insects, ancestry of, 493. Intermaxillary gland of Axolotl, 623. J. Jullien, on _Lissotriton punctatus_, 591. K. Kant, referred to, 638, 709. Kirby, W. F., “Synonymic Catalogue” referred to, 2, 49, 435, 449. Kleemann, larva of _S. Ligustri_, 259. Knaggs, Dr. H. G., seasonal dimorphism of _S. illustraria_, 4. Kölliker, Prof., experiments with Axolotl, 564; characters of Axolotl, 575. L. _Lacerta muralis_, colour variations, 361. Lake of Mexico, 603, 608, 621. Lange, F. A., “History of Materialism” referred to, 645, 656. Langer, Prof., experiments with _Pelobates_ tadpoles, 607. Lankester, Prof. E. R., on degeneration, 583. _Lasiocampa Pini_, larva eaten by lizards, 336; variable in two stages, 405. Lepidoptera; foes, 8; larva and imago independently variable, 401; species constant in three stages, 405; species variable in three stages, 405; variable in two stages, 405; variable in one stage, 406; causes of variability of pupæ, 411; case of incongruence among pupæ, 540. _Leptodora hyalina_, development, 93. _Lepus timidus_, white variations of, 662. Leuckart, reproduction of _Ascaris nigrovenosa_, 90; on growth, 654. Leydig, on sexual larvæ of _Triton_, 591. _Limenitis Artemis_ and _L. Proserpina_, dimorphic in both sexes, 32; _L. Camilla_, constant in three stages, 405. Lines, dorsal, subdorsal, supra- and infra-spiracular, 175. _Lissotriton punctatus_, sexual larvæ, 591, 595. Lizards, colour variation of, 361; rejection of caterpillars by, 336. Local forms, distinct from climatic varieties, 45; produced by isolation, 109. Lockyer, B., young _Noctua_ larvæ, 166. _Lophostethus Dumolinii_, larva, 527. _Lophura hyas_, larva, 254. Lubbock, Sir John, insect metamorphosis, 65, 431; derivation of metagenesis, 83; colours of caterpillars, 294; ancestry of insects, 493. _Lycæna pseudargiolus_, larva and ants, 290. M. _Macroglossa_, larvæ of, 245; _M. stellatarum_, oviposition of, 245; 1st, 2nd, and 3rd larval stages, 246; 4th and 5th stages, 247; di- and polymorphism of larva, 247; pupa of, 250; _M. belis_, and _M. pyrrhosticta_, larvæ, 255. Markings, general biological value of, 285; special biological value of, 308; subordinate, 347; of _Sphingidæ_, evolution of, 380. Marsh, Prof., on _Siredon lichenoides_, 567. Matter, assumption of, 711; conscious, 714. Mayer, Paul, insect phylogeny, 493. McLachlan, R., phytophagic variability, 305. Mechanism and teleology, 694.