INDEX. 



ABBOT and Smith, descriptions of 

 larvae, 192, 216, 261, 263, 268, 



452. 453- 



Acherontia Atropos, South African 

 form of larva, 263, 324 531 ; larva 

 in Spain, 324 ; larva phytophagi- 

 cally variable, 531. 



Acosmeryx anceus, larva, 192. 



Acrcea and Maracuja butterflies as 

 larva?, pupa?, and imagines, 536. 



Acronycta, affinities of genus, 169. 



Adaptation, 281, 589 ; analogous. 

 376; physiological, 590; mutual, 

 647. 



Allen, J. A., variation in birds and 

 mammals, 658. 



Alpine form of P. Na/>i, 40. 



Alpine hare, seasonal change of 

 colour, 7. 660. 



Alternation of generations, 80, 699, 

 702. 



Amfrlystoma. A. mavortium from 

 Siredon lichenoides, 567 ; A, 

 tigrinum bred by DumeYil, 567 ; 

 distribution of species of genus, 

 569 ; habits of species, 573 ; a 

 reversion form, 581, 592 ; sterility 

 f< 593 : oviposition by, 594, 623 ; 

 definition of genus, 610 ; dc- 

 gcneration of, 612 ; causes of 

 reversion of, 600. 608, 613, 620, 

 631 ; A. punctatum and A. 

 fasciatum, development of, 623 ; 

 summer sleep of, 628 ; A. ///.; 

 Hum, metamorphosis of, 629. 



AmbuIyxgannascvsanA A. litnr t jln, 

 larvar, 245. 



Amixia, the principle of, 46, 1 10. 



Ammonites, 275. 



Ampehplia^a rubiginosa, larva, 



192. 



Amphibia of Upper Engadine, 615. 

 Amfhiiima, characters of genus, 



579- 



Anceryx, larva, 264 ; stages 3, 4, 

 and 5, 266. 



Aphaniptera, characters of, 498. 



Aphides, organic reproduction of, 

 97- 



Araschnia. A. levana and A. 

 Prorsa seasonally dimorphic, 2 ; 

 dimorphism of larva?, 6 ; A. 

 lmana, first experiments with, 

 10 ; A. var. porjma, artificial 

 production of, 10, 17 ; A. /a>ana, 

 Uorfmeister's experiments with, 

 II ; explanation of seasonal 

 dimorphism of, 19 ; northern, 

 extension of, 20 ; A. prorsa 

 gradual origination of 22 ; A. 

 levana^ reversion of, caused by 

 high temperature, 37 ; the Inmna 

 form the most constant, 43, and 

 sexually dimorphic, 43 ; summer 

 and winter forms compared, 56 ; 

 experiments with A. levana, 117; 

 A. levana, variable in all three 

 stages, 405; incongruence in 

 genus, 449. 



Argent, W. J.. phytophagic varia- 

 bility of larva of Sphinx Ligus/n, 

 306. 



Argynnts faphia, dimorphism of, 

 250. 



Artemia salina mAA. ^filhansenii t 

 transformations of, 635. 



