_Deilephila_, division of larvæ into groups, 199; _D. Euphorbiæ_, 1st larval stage, 202; 2nd and 3rd stages, 203; 4th and 5th stages, 205; _D. nicæa_, larva, 207; _D. dahlii_, larva, 208; _D. vespertilio_, larva, 209; _D. Galii_, larva, 211; 5th stage, 213; _D. livornica_, larva, 215; _D. Zygophylli_, larva, 217; _D. Hippophaës_, larva, 218, 650; division of larvæ according to phyletic stages, 223; genealogy of, 358; _D. Galii_, larva rejected, 340; _D. Euphorbia_, larva eaten, 340; habits of larvæ and imagines, 412; _D. Robertsi_, larva, 525. Development; of marking of Sphinx-larvæ, laws of, 274; phyletic, of markings of _Sphingidæ_, 370; unequal phyletic, 460. Dimorphism and polymorphism; of butterflies, 250; of Sphinx-larvæ, 300; of pupæ, 412. Diptera, incongruences among, 488; imaginal characters of, 488; divisions of, 498. Dodo, extinction of, 651. Dohrn, A.; on degeneration, 583; on functional change, 590. Dorfmeister, G.; experiments with _A. levana_, 11. Duponchel; figures of larvæ referred to, 207, 208, 218, 253. Duméril; experiments with Axolotl, 555, 564, 566, 593; characters of Axolotl, 375, 576. E. Edwards, W. H., seasonal dimorphism of _P. pseudargiolus_ and _P. violecea_, 4; of _P. Tharos_ and _P. Marcia_, 4; of _P. Ajax_, 30; of _L. Artemis_ and _L. Proserpina_, 32; experiments with _P. Ajax_ and _P. Tharos_, 33, 126, 140; pupal period of winter forms of _P. Ajax_, 36; experiments with _G. interrogationis_, 149; early stages of larvæ of N. American butterflies, 165; larva of _P. pseudargiolus_ and attendant ants, 290; figures of larvæ referred to, 165, 436, 437. Eimer, colour variation in _Lacerta muralis_, 361. _Emmelesia unifasciata_, larva phytophagically variable, 307. Environment, direct and indirect action of, 686. _Ephyra punctaria_ and _E. omicronaria_, seasonal dimorphism of, 4. _Eriogaster lanestris_, larva eaten by lizards, 336. _Eriotus Pteridis_, resemblance of larva, 320. _Euchelia Jacobææ_; larva and imago rejected by lizards, 336; constant in all three stages, 405. _Euchloe_: _E. belia_ and _E. ausonia_, seasonal dimorphism of, 3; _E. belia_, climatic variation of, 47; var. _Simplonia_ in Alps, 48; _E. belemia_, seasonal dimorphism and migration of, 78. _Euproctus Rusconii_, habits of, 617. _Eusmerinthus Kindermanni_, larva, 526. Evershed, J., larva of _C. porcellus_, 188. Eye-spots; repetition of, 277; development of, 325, 327; terrifying action, 330; resemble flower-buds, 334; useful when rudimentary, 366. F. Fatiot, Amphibia of Upper Engadine, 616. Fechner, on conscious matter, 714. Filippi, De, _Triton alpestris_, 585. Forel, Prof., fresh water _Pulmonifera_, 590.