ANALYTICAL INDEX 



DUCTION TO DISCUSSION ON, II. 



63-5. 



Whewell, W., on the study of 

 Final Causes as a stimulus to inquiry, 

 xlvi n. I. 



White Admiral, 342 : see also 

 Limenitis, 218, 274, 342. 



White under surface of animals 

 interpreted by A. H. Thayer, 299. 



Whiteness, J. C. Prichard on local 

 development of, 187. 



' Why ' and ' How ', both answers 

 essential, xlvi, xlvii. 



Wichura, proof thathybridsof.SW2.r 

 do not follow Mendel's principle 

 by, xxxv n. I. 



Wiggins, C. A., butterflies from the 

 V. Nyanza collected by, 69 ; on H. 

 misippus and its model, 216 n. I. 



Wight, Isle of, effect on plants of 

 wind in, 75. 



Windle, Prof. B. C. A., on Roux's 

 researches, 128 n. I ; on Teratology, 

 136 n. i. 



Wings, stability of pigments in 

 butterflies', xlv, xlv n. I, 53 ; as evi- 

 dence of uniformity of conditions in 

 geological times, 18 ; insects in 

 oceanic islands often without, 18; 

 immense size of, in Carboniferous 

 dragon-flies, 18, 37 ; fully developed 

 in Carboniferous Phasmids, 36 ; evo- 

 lution of insects', 36, 37 ; ancient 

 insects probably with six, 37; seasonal 

 change of form in butterflies', 206, 

 207, 310, 311; eye-spots especially 

 developed on under surface of, 210, 

 211, 326, 340, 341 ; of butterflies 

 injured as if by enemies, 270, 270 n. i, 

 281-3, 3 2 5 5 darkening of hind, in 

 Guiana mimetic butterflies, 272, 

 2 73, 331) 332, 350; of dragon-flies, 

 butterflies, moths, flies, and cicadas 

 in nests of Microhierax, 290, 291, 

 291 n. i. 



Winter moth, 1 56. 



Winter, the time of stress, 148, 

 209, 3*7, 3 2 o: see also dry season. 



Wisconsin, 118 n. i, 252, 253, 256, 

 380. 



Wisconsin Geological and 

 Natural History Survey, 118 n. i. 



Wood splinter, protective resem- 

 blance to, 319. 



Woodland in S. Africa, definition 

 of, 340. 

 Woodpecker, Darwin on the in- 



adequacy of Mutation to account for 

 the, xix. 



Woodward, Henry, on evolution 

 of Crustacea, 40 n. i. 



Worms, prey allured by pseud- 

 episematic resemblance to, 378. 



Wortman, Dr., on formation of 

 joints by pressure, 115. 



Wright, Miss F. A., on pupal 

 stage of V. urticae, 306. 



X 



xenocles, Papilio, a Danaine mimic 

 not attacked by bee-eaters, 288. 



Xylocopidae, see classification of 

 examples of mimicry, 389, 391-2. 



Yerbury, Col. J. W., on forms of 

 Limnas chrysippus, 70 n. I, n. 2 ; on 

 Pard fly mimicking Hymenoptera, 257 

 n. I ; direct evidence of the attacks 

 of birds on butterflies obtained by, 

 283, 285, 286. 



Yoonzaleen River, Burma, 290. 



Yorkshire and Lancashire, recent 

 darkening of moths in, 308-10. 



Young enemies, Miillerian mimicry 

 and, 1 66-8, 212-15, 222, 278, 327- 

 31, 366; advantage of episematic 

 markings to, 357. 



Zea, Darwin on sterility between 

 selected varieties of, 79. 



Zebra, invisibility of, 298. 



Zeitschr. f. Wissenschaft. Zool., 

 84 n. 2, 334 n. 2. 



zitenius, Melanitis, king-crow 

 unable to find, 288, 289. 



Zittel, Karl A., Palaeontologie 

 by, consulted for Essay I, 43. 



Zonosoma (Ephyra), cocoon re- 

 placed by loop, &c., in, 1 50 ; parallel- 

 ism with Pierinae, 150 ; cryptic 

 colours of larva and pupa of, 150; 

 unique dimorphism in larva and 

 pupa of, 1 50. 



Zool. Ergeb. einer Reise in Ost- 

 Afrika, F. Stuhlmann, Hemiptera, 

 Gerstaecker, 255. 



Zoological Congress at Berlin 

 (1901), Author's English Address to, 

 the original form of Essay IX, 271 ; 

 Report of the, 271. 



Zoological Society of London, 



