45 : 



ANALYTICAL INDEX 



Notley, Miss M. E., on pupal stage 

 of V. urticae, 306. 



Novitates Zoologicae, Tring, xvi, 

 53 n. i,66n. 2, 77,85. 



Nuclei of germ-cells in fertilization, 

 xxxi, 80-2 ; delicacy of mutual adjust- 

 ment in fertilization, 80-2 ; the seat 

 of the germ-plasm, 128. 



nuniata, Heliconius, exact resem- 

 blance of to M. mneme, 331 : see 

 also mneme ; probable gradual ap- 

 proach of to M. mneme, 332, 333. 



Numbers, effect on mimics of 

 relative, 328-33. 



Nummulina in the Carboniferous, 

 27. 



Nyanza, Victoria, see Victoria 

 Nyanza, xxxv, 69, 338, 374, 374 n. 3. 



Nymphalinae, Pupae of af- 

 fected by Gravity, V. 151, 152. 



Nymphalinae (see also classifica 

 tion of examples of mimicry, 383-7) : 

 methods of pupation in, 151 ; 

 seasonal changes in, 87, 207-8, 211, 

 310, 311, 320, 320 n. 1, 326, 339-42 ; 

 eye-spots in wet season forms of, 

 211, 326, 340-1 ; too exclusive study 

 of mimicry in Pierinae and, 229 ; 

 darkening of mimetic species of, in 

 the Guianas, 272, 273, 350; mimetic 

 species of, may be Miillerian, 272, 

 273 ; unpleasant scent in African 

 species of, 316; Dr. F. A. Dixey on 

 entrance into Miillerian combinations 

 of species of, 343 ; preferring station 

 different from that of model, L. 

 chrysippus, 349 ; combinations of 

 procryptic and mimetic colouring 

 not uncommon in, 350. 



O 



Oberea, mimicry of Hymenoptera 

 by, 257 n. 1 ; method of attainment 

 of mimicry by, 280. 



Oberthiir, Monsieur Charles, on 

 variation in Heliconia, 69 ; on the 

 distribution of Athyma punctata and 

 Limenitis albomaculata and their 

 model, and on the females of these 

 species, 381, 382. 



obscurata, Gnophos, colour on 

 chalk and on peat of, 307, 308. 



Observations on Indian Butter- 

 flies, T. R. Bell, 207 n. 1 : see also 



341. 



Observations on Sexual 

 Selection in Spiders of the 



Family Attidae, George W. and 

 Elizabeth G. Peckham, 380. 



Observations on the Coloration 

 of Insects, Brunner von Wattenwyl, 

 Engl, transl. by E. J. Bles, 256. 



Occasional Papers of the Nat. 

 Hist. Soc. of Wisconsin, 252, 253, 

 380. 



Ocean, floor of, 20-2 ; basins, 

 stability of, 21 ; general Protective 

 (Procryptic) Resemblance to, 297, 

 298. 



Oceanic islands, wingless insects 

 in, 18. 



ocellatus, Smerinthus, derived 

 chlorophyll passing into eggs and 

 offspring of, 314, 314 n. 2. 



ochlea, Amanris, a dominant 

 model in E. Africa, 336. 



Odonata (Protodonata) of Com- 

 mentry Carboniferous, 18, 37. 



Odontopera bz'dentata, 306. 



Odour, see smell. 



Odynerus, species of, resemble 

 other Hymenoptera in Australia, 

 278. 



Oecodoma, see Atta. 



Oecophylla, mimicry of, by cater- 

 pillar, 368. 



Oedipoda, value of bright hind 

 wings of, 303, 304. 



Oenotheras as the evidence for 

 Mutation, xix-xxii, 4. 



Oenothera crttciata, xxi, xxii, xxxv 

 n. 1 ; — /amarch'ana, xix-xxii, xxxv 

 n. I, 4. 



Of the Causes which have given 

 rise to Varieties in the Human 

 Species, J. C. Prichard, 176, 177. 



Of the Relation of particular 

 Varieties of the Human Species 

 to Climates, J. C. Prichard, 191, 

 192. 



Old World, Euploeini nearly ex- 

 clusively Austro- Malayan, Danaini'm 

 all tropics of the, 333. 



Oligocene, Myriapoda in the, 34. 



omphale, Teracolus, experiments on 

 seasonal forms of, 311 ; Miillerian 

 mimicry chiefly in dry f. of, 342. 



On Geological Time, Lord 

 Kelvin, 4. 



On some Difficulties of Dar- 

 winism, Prof. D'Arcy Thompson, 

 225 n. 1. 



On the Age of the Sun's Heat, 

 Lord Kelvin, 4 n. 3. 



