726 



Index. 



and ontogeny of Sphinx-mark- 

 ings, 177; of insects, 493. 



Pieritue, seasonal dimorphism of, 

 13 ; analogous seasonal dimor- 

 phism in, 60, 1 08 ; experiments 

 with, 122. 



Pieris Napi, experiments with, 13; 

 summer form the younger, 29 ; 

 reversion of, caused by mechanical 

 vibration, 38 ; var. Bryonia, the 

 potential winter form, 39 ; ex- 

 periments with this var., 40 ; this 

 var. the parent form of Napi, 41 ; 

 a climatic var., 41 ; very variable, 

 43 ; variability due to crossing, 

 43 ; var. cestiva more variable 

 than var. vernalis t 43 ; P. Napi, 

 summer and winter forms com- 

 pared, 56 ; incongruence in this 

 species, 457 ; P. Kruepeti, sea- 

 sonal dimorphism of, 78 ; P. 

 Brassicce, larva rejected by 

 lizards, 337 ; constant in three 

 stages, 405 ; photographic sensi- 

 tiveness of pupa, 405 ; P. Napi, 

 variable in two stages, 405. 



Plants, cultivated, 107 ; sterility of 

 reverted, 596. 



Plastidule theory, 667. 



Plebeius amyntas and P. poly- 

 spenhon, seasonal dimorphism, 

 2 ; P. Alexis, do., 3 ; P. pseud- 

 argiolus and P. violacea, do., 

 4 ; P. agestis, do., 50 ; polymor- 

 phism of females in this genus, 

 251. 



Pluvial period, 621. 



Polar animals, colour of, 658, 660. 



Polyommatus phlaas, distribution 

 and climatic variation, 49 ; sea- 

 sonal dimorphism, 50 ; Italian 

 summer and winter forms com- 

 pared, 55. 



Polyptychus dentatus, larva, 244. 



Ptarmigan, seasonal colours of, 6. 



Pterogon, larvae of, 255 ; P. 

 cenvthera, larva, 256. 



Pulinonifera, functional change in 

 lungs, 590. 



Pygcera bucephala, larva rejected 

 by lizards, 337. 



QUATREFAGES, De, spermatozoa of 

 Amblystoma, 593. 



Rana temporaria of Upper Enga- 



dine, 618. 

 Ratzeburg, larva of Anc. Pinastri, 



265. 



Reproduction and growth. 664. 

 Reversion, of species, 611; two 



modes of, 612 ; periodic, 613. 

 Rhopalocera, characters of, 433, 



471- 



Rhytina Stelleri, extinction of, 651. 



Riley, C. V., descriptions of cater- 

 pillars referred to, 437, 521, 522 ; 

 on sexual dimorphism in cater- 

 pillar, 535. 



Ring-spots, 325 ; development, 327 ; 

 signs of distastefulness, 341 ; re- 

 sembling berries, 344. 



Rosel, breeding of Aras. Levana 

 by, 6 ; on larva of JLfeif. Euphor- 

 bia, 206 ; of D. Galii, 213; of 

 Smer. Tilia, 236 ; of S. ocellatus, 

 240 ; of Anc. Pinastri, 265, 268. 



Roux, Dr. W., struggle of parts in 

 the organism, 689. 



Rutherford, D. G., colour variations 

 of Ater. mdeagris, 8. 



8. 



SACC, on sterility of Amblystoma, 



593- 

 Salamanders, habits of Italian land 



species, 617 ; oviposition of, 630. 

 Salamandra atra, experiments with, 



615. 

 Salamandnna, characters of, 577 ; 



S. perspicillata, habits of, 617. 

 Sars, development -of Leptodora 



hyalina, 94. 

 Saturnia. S. carpini, larva eaten 



by lizards, 338 ; J>'. Yamamai, 



variable in first stage only, 406 ; 



S. carpini, development of larv;x 



of local forms, 419. 



