198 INDEX. 



Corylophus, apterous in Madeira, 82. 



Criomorphus, Curtis, referable to the genus Delphax, 45. 



Cyclostom.a lucidum, Lowe, its extinction in Porto Santo, 131 . 



Cynthia Cardui, Linn., unaffected by climate, 32. 



Cynucus, a species of, seventeen miles from shore, 150. 



Cyrtonota, its concentration in S. America, 143. 



Darwin, Mr., on the fauna of the Galapagos, 23 ; relative propor- 

 tions of the insect tribes in the tropics, 28, 29 ; on the insects of 

 Tierra del Fuego, 47 ; on the natural features of Tierra del Fuego, 

 50 ; on the insects of Keeling Island, 55 ; on the insects of St. 

 Helena, 55; on the insects of Ascension, 55 ; on the apterous 

 condition of insular species, 86 ; on the fauna of the Cordillera, 

 145 ; on a Calosoma captured at sea, 147 ; on insects captured 

 in the sea, 149, 150; on the disappearance of animals before 

 more powerful ones than themselves, 178. 



Dawson, Rev. J. F., on a variety of Bembidium saxatile, 60. 



Definition of the term * species,' 4 ; of the term ' variety,' 4. 



Delphax, on the development of the wings of, 45. 



Dermestes vulpinus, Fabr., unaffected by climate, 31 . 



Deucalion, its occurrence on the Salvages and Dezertas, 125. 



Desertarum, Woll., its sedentary nature, 125, 126, 127. 



Dichelus, its concentration in S. Africa, 143. 



Differences, when to be regarded as specific, 6 ; too exclusively 

 studied, 12. 



Diffusion, various means of, which operate on the insect tribes, 148. 



Disturbing agents, Prof. Henfrey on, 8. 



Ditylus, the same type of, indicated in the Canaries and Salvages, 124. 



Domesticated animals, pliable nature of, 187, 192. 



Dromius arenicola, Woll., representative of D. obscuroguttatus, 66. 



fasciatus, Gyll., its paleness near the sea, 63. 



negrita, Woll., perhaps an ultimate state of D. glabratus, 85. 



obscuroguttatus, Dufts., its changes in Madeira, 36, 37, 38 ; 



apterous in Madeira, 84. 



sigma, Rossi, its colour affected by isolation, 88, 89. 



Elevation, sometimes corresponds with latitude, 35, 114. 

 Ellipsodes glabratus, Fabr., singular variety of, on one of the Ma- 

 deira Islands, 88, 109. 



Elytra, connateness of, a variable character, 96. 

 'Endemic,' to what species the term is applicable, 118. 

 Entomology, the study of, does not necessarily cramp the mind, 111. 

 Ephistemus, apterous in Madeira, 82. 

 Eucalypti, their concentration in Australia, 142. 

 Eunectes sticticus, Linn., unaffected by climate, 31. 

 Euphorbias, their concentration in Southern Africa, 142. 



