INDEX. 



AbeiTation, perhaps indicated universally, 16, 17, 18. 



Aborigines, insect, unimportant for climatal modifications, 25, 26, 27. 



Acalles, the Canarian type of, apparent on the Salvages and De- 

 zertas, 124. 



Neptunms, WoU., perhaps a state of A. argillosus, 124. 



Achatina EuUma, Lowe, its extinction in Porto Santo, 131. 



Achenium Hartungii, Heer, a form of A. depressum, 65. 



Aeherontia Atropos, Linn., its introduction into Madeira perhaps 

 recent, 74. 



Adimonia, the capture of, out at sea, 150. 



Aepus marinus, Strom., pallid hue of, 64. 



Robinii, Lab., pallid hue of, 64. 



Agdbus bipustulatus, Linn., unaffected by climate, 31. 



Alligators, their peculiarity to S. America, 143. 



Alpine species, some peculiarly so, 40. 



Altitude and latitude, sometimes reciprocal, 35, 114. 



Amyeterus, its concentration in Australia, 143. 



Amyot, M., his ' Methode Mononomique,' 164. 



Analogies, Lord Bacon on the importance of, 13 ; why necessary to 

 be studied, 14. 



Analogy, argument from, 10, 11, 12. 



Anohomenus marginatus, Linn., slightly modified in Madeira, 38. 



Andes, dissimilarity of the fauna on the opposite sides of the, 146. 



Anobium striatum, Oliv., unaffected by climate, 31. 



Antennae, joints of, said occasionally to vary, 96. 



Anthicus bimaculatus, lUig., variability of, near the sea, 63. 



fenestratus, Schmidt, slightly modified in Madeira, 38. 



humilis, Germ., variability of, in salt places, 63. 



instabilis, Hoffm., pallid hue of, 64. 



Anthonomus ater, Mshm, very small in Lundy Island, 58, 73. 



Aphelocheirus cestivalis, Fabr., the hemelytra of, sometimes fully 

 developed, 100. 



Aphodius nitidulus, Fabr., paler in Madeira than in Europe gene- 

 rally, 65. 



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