8 INDIAN FOREST INSECTS 



appear to be at home both in a hot dry cHmate and in a hot moist one. 

 Finally, it is not possible to base a distribution list on the species of 

 trees attacked. In the coniferous areas of the Western Himalaya it is 

 apparent to some extent that certain species of one or more genera are 

 confined to certain species of tree; in some cases a genus may be con- 

 fined to a particular tree ; or another genus and certain species in it may 

 infest more than one species of tree ; or, lastly, to one or two species of 

 trees one or more species in one or more genera may confine their attacks. 



In the case of predaceous insects instances are known where a par- 

 ticular species is found throughout the plains forests attacking a certain 

 genus of bark beetles, its distribution apparently depending on the distri- 

 bution of the genus upon which it preys. 



