416 



INDEX 



Loomis, adaptive value of lower valve 



of Hippurites, 335 

 — , examples of excessive size and com- 

 plexity, 331, 332 

 Lotsy, evolution by hybridisation, 25, 



27,318 

 — , new definition of species, 73 

 Love and Leighty, correlation, 161 

 Lowe, intermediacy due to crossing, 



88 

 Lowndes, insular Crustacea, 335 

 Lucilia, species separable in male sex 



only, 121 

 Lull, appearance of direction in evolu- 

 tion, 327 

 — , orthogenesis, 324 

 Lundblad, insular Hydracarina, 135 

 Lutz, adaptive differences in ovipositor 



of Gryllus, 284, 285 

 — , correlation in Gryllus, 163 

 — , selection experiments in Drosophila, 



284-85 

 Lycid beetles, mimicry, 252 

 Lygaeus, geographical variation, 1 1 2 

 Lymantria, experiments on, 36 

 Lysiphlebus, temperature-relation with 

 Toxoptera, 359 



McAtee, observations on food of 



birds, 249-51 

 — , value of experiments on captive 



birds, 253 

 MacBride, experiments on Goldfish, 



4 1 

 Macdermott, species-recognition by 



light-signals, 146 



Macdougall, experiments on rats, 28, 



4° . 

 Macgillavry, habitat of Cicindela, 145 



Machaerodonts, size of canine teeth, 



33 1 * 334 



Maclagan, optimum conditions for 

 Smynthurus, 358 



— , optimum population density, 359 



Macoma, Baltic form, 169 



Macromerinae, specific characters, 277 



Malaria, 120 



Mammals, albinism, 92 



— , baculum, 297 



— , colour-polymorphism, 282 



— , colours of arctic species, 241-42 



— , comparison of recent and Pleisto- 

 cene forms, 133 



— , death-rates in nature, 194 



— , distribution of races, 82 



■ — , offensive weapons, 293 



— , protective resemblances, 235 



— , runways as protection against en- 

 vironment, 360 



— , scent-production, 293 



Manhardt, changed habits of Luperus, 



54. 

 Mantis, co-adaptation in foreleg, 309 



— , selective elimination of colour- 

 forms, 202 



Mantispa, co-adaptation in foreleg, 309 



Marco Polo's Sheep, size of horns, 332 



Marlatt, broods of Seventeen-year 

 Cicada, 142 



Marshall, mimicry of Lycid beetles, 252 



' Mass-mutation,' 217 



Matthew, Machaerodont tigers, 334 



Mavor, effects of X-rays, 24, 29 



Mayer, wing-colour of moths in rela- 

 tion to mating, 149, 296 



Mayer and Soule, wing-colour of moths 

 in relation to mating, 296 



Mechanism, 362 



Meinertzhagen in Cheesman, protective 

 resemblance in Ammomanes, 238 



Melanism, in Camptogramma, 202 



— , in insular forms, 1 39 



— , in Lepidoptera, 213-14 



— , supposed causation of, in Lepido- 

 ptera, 30 



Melipona, permutations of characters, 

 174 



Melitaea, change in population, 2 1 3 



Mercier, seasonal variation in genitalia, 



: 5 2 

 Meriones, isolation of races, 1 34 



Mertens, independent variation of 



characters, 166 



— , melanism in insular forms, 139 



Messor, optimum temperature for races, 



"9 

 Metalnikov, experiments on Galleria, 38 



Metcalf, determinate evolution, 325 

 Mice, alteration of mutation-rate, 29 

 — , application of Allen's Law, 48 

 — , correlated modifications, 169 

 — , selective origin of race, 201 

 Mickel, fluctuations in size of Dasy- 



mutilla, 79, 156 

 Micraster, lineages, 65 

 Microbracon, length of life, 22 

 — , non-heritable variants, 20 

 Micronecta, geographical trends, 78 

 Microspecies, 64 

 Middleton, change of habits in Grey 



Squirrel, 55 

 — , epidemics and size of populations, 



320 

 — , spread of Grey Squirrel, 322 

 Migration, effect on geographical 



variation, 104 

 — , effect on isolation, 146 

 Miller, G. S., races of Tragulus, 1 16 

 Miller, R. C, species of doubtful status, 



63 

 Mimicry, 251-65 



