INDEX. 203 



NotiopMlus geminatus, Dej., large size of, on one of the Madeira 

 Islands, 88. 



Observation, indispensable in natural science, 20, 159, 192. 



Ocean, the, its hindrance to insect- diffusion, 145. 



Ochthebius marinus, Payk., lurid hue of, 64. 



Olisthopus, apterous in Madeira, 82. 



Maderensis, Woll., large state of, on one of the Madeira Islands, 



88, 89. 

 rotundatus, Payk., very small in the Scilly Islands, 58, 73 ; 



subapterous in the Scilly Islands, 1 02. 

 Omaseus nigerrimus, Dej., a form of 0. aterrimus, 33. 

 Omias Waterhousei, Woll., large state of, on one of the Madeira 



Islands, 88, 109. 



Oncocephalus griseus, development of the wings of, 101. 

 Othius, apterous in Madeira, 82. 

 Ourangs, their peculiarity to the Indian Islands, 143. 

 Oxyomus, a modification of Aphodius, 144. 



Pachymerus brevipennis, the development of the wings of, 100. 



Pachyrhynchus, its concentration in the Philippine Islands, 143. 



Painted-Lady Butterfly, unaffected by climate, 32. 



Papilio Machaon, Linn., unaffected by climate, 31. 



Paropsis, its concentration in Australia, 143. 



Patagonia, insects of, distinct from those of Tierra del Fuego, 47, 48. 



Patrobus septentrionis, Dej., has been supposed to be a state of P. 

 excavatus, 40. 



Pecteropus, its maximum attained in the Canaries, 124. 



Maderensis, Woll., varies from altitude, 39. 



rostratus, Woll., varies from isolation, 90. 



Pelargoniums, their concentration in Southern Africa, 142. 



Pelophila borealis, Payk., larger in Ireland than in the Orkneys, 33. 



Phaleria cadaverina, Fabr., pallid hue of, 64. 



Pkilhydrus melanocephalus, Oliv., two states of, frequently indicated, 

 105. 



Phlwophagus, apterous in Madeira, 82. 



Phosphuga atrata, Linn., taken with the wings developed, 102. 



subrotundata, Leach, the Irish form of the P. atrata, 33. 



Phytophaga, preponderance of, in the tropics, 28, 29. 



Pieris Brassicce, Linn., varies in Nepaul and Japan, 34. 



Pissodes notatus, Fabr., unaffected by climate, 30. 



Platyomus, its concentration in S. America, 143. 



Platyrrhini, their peculiarity to S. America, 143. 



Pogonus luridipennis, Germ., lurid hue of, 64. 



Pontia Brassicce, Linn., its introduction into Madeira probably re- 

 cent, 74, 



