Baer, Karl Ernst von, on the mechanism of nature, 639; on the vital force, 641; on the theory of selection, 694; on causality and purpose, 708. Baird, Prof., on the development of species of _Amblystoma_, 623. Balbiani, reproduction of Aphides, 97. Balfour, F. M., on insect phylogeny, 485, 494. Bates, H. W., local variation in Amazonian Lepidoptera, 60. Bees, embryological development of, 483. Belt, Thomas, on coloured frogs, 294; on the glaciation of North America, 622. Biogenetic law, corollary of, 611. Birchall, E., local variation in British Lepidoptera, 60. Blanchard, on oviposition of _Amblystoma_, 594. Boisduval, figures of larvæ referred to, 216, 218, 245; on snake-like appearance of the larva of _D. nicæa_, 342; on the relationship of _Euchloe belia_ and _E. ausonia_, 48. _Bombycidæ_, early stage of larvæ, 166. _Bombyx._ _B. cynthia_, colour changes in larva, 7; _B. neustria_, caterpillar refused by lizards, 336; _B. Rubi_, caterpillar eaten by lizards, 338. Boscher, E., dimorphism of larva of _S. ocellatus_, 241, 306. Brauer, insect phylogeny, 493. Burmeister, figures of larvæ referred to, 195, 196, 224, 232, 255, 261, 263, 436, 437; early stages of larvæ of Argentine butterflies, 166. Butler, A. G., affinities of genus _Acronycta_, 169; genera of _Chærocampinæ_, 190, 192, 194, 196; genera of _Smerinthinæ_, 233, 243, 244; genera of _Macroglossinæ_, 253, 254; species of _Pterogon_, 256; genera of _Sphinginæ_ and _Acherontiinæ_, 262; on coloured larvæ being rejected, 336; affinities of _Sesiidæ_, 370; descriptions and figures of new Sphinx-larvæ, 524, 526. Bütschli, embryology of bees, 483. Butterflies, action of warmth in producing changes in colour and marking, 58; summer and winter larvæ and pupæ alike in seasonally dimorphic species, 64; seasonally dimorphic species hibernate as pupæ, 73; odoriferous organs, 102; early stages of larvæ, 165; di- and polymorphism of, 250; crepuscular habits of certain species, 475. C. _Callosune eupompe_, polymorphism of female, 251. Cameron, P., on larva of _S. ocellatus_, 241, 282; protective habits of saw-fly larvæ, 290, 294. Carlin, W. E., on _Siredon lichenoides_, 630. Caterpillars, origin of markings, 161; means of defence, 289; defensive habits, 290; food of brightly coloured species, 294; habit of concealment by day, 291, 296; phytophagic variability, 305, 531; seasonal variability, 305; experiments with ocellated species, 330; experiments with annulated species, 336; sexual dimorphism of, 308, 527, 534; independent variability of stages, 416. _Cecidomyia_, metagenesis of, 82, 586.