203 INDEX. 



on the eiFects of a volcanic eruption in destroying species, 1/9 ; on 

 the flexible nature ofcertain animals and plants, 187; on the greater 

 differences which varieties often present than do species, 193. 

 hygcms brevipennis, Latr., on the development of the wings of, 

 101. 



Macrottota, its peculiarity to Java, 143. 



Madeira, has some features in common vrith Tierra del Fuego, 48, 

 49, 50, 61 ; former state of, 48, 49 ; great fire on the southern 

 side of, 49 ; origin of the name of, 50 ; the insects of, 55 ; the 

 tendency of its insects to become apterous, 82 ; the migratory 

 direction of its insect population, 119; the local nature of its 

 various species, 152, 153. 



Magnolias, their concentration in Central America, 142. 



Malta, Mr. Gould on the birds of, 102. 



Malthodes Kiesenwetteri, WolL, perhaps a state of M. brevicollis, 66. 



Man, agency of, in the destruction of species, 179. 



Mantura Chrysanthemi, Ent. H., variability of, in Lundy Island, 59. 



Marsupialia, their concentration in Australia, 142. 



Mesembryanthemums, their concentration in Southern Africa, 142. 



Mesites, a modification of Cossonus, 144. 



Maderensis, WolL, its near relationship to the M. Tardii, 14 1 . 



Tardii, Curtis, its variability near the coast, 58. 



'Methode Mononomique,' the unsoundness of, 164 — -168. 



Migratory powers, slowness of, in the Madeiran Helices, 130 — 132. 



progress, direction of, in the Madeiran animals, 120, 135. 



Mimosas, their concentration in Austraha, 142. 



MoUusca, Terrestrial, often present two distinct states, 106. 



Moluris, its concentration in S. Africa, 143. 



Monochelus, its concentration in S. Africa, 143. 



Mountain-chains, their hindrance to insect-diffusion, 145. 



Mountain-tops, either very prolific in insect life, or else barren, 115. 



Mus Rattus, almost exterminated in England, 178. 



Mycetoporus pronus, Erichs., two distinct states of, indicated, 106. 



Myrtles, their concentration in Australia, 142. 



Naturalist, the, what his province to investigate, 158. 



Nature, not irregular because presenting occasional anomalies, 94. 



Naupactus, its concentration in S. America, 143. 



Nebria complanata, Linn., unusually pale near Bordeaux, 33 ; pallid 



hue of, 64. 

 New World, some of its insects perhaps but states of those of the 



Old, 37. 

 Nomenclature, a binomial system the only true one, 164, 168. 

 Notaphus, the capture of, out at sea, 1 50. 

 Notiophili, extremely variable, 40. 



