6 TRAVELS AMONGST THE GREAT ANDES. 



to their acquiring a footing. That these facilities are possessed in a 

 higher degree by Plants than Insects and some other groups of animals 

 may be a sufficient explanation of the fact that so many species of 

 Plants have surmounted the obstacles to their passage from north to 

 south during the last Glacial epoch, Mdiile few or no Insects have done 

 so. The more distant, or generic, relationship between the Insects of 

 Chili and those of the North Temperate zone can only be explained on 

 the assumption of a migration at some epoch far more remote than the 

 last Glacial epoch. 



TRACHYDERES VERMICULATUS, BATES. 

 NEAR CHILLO. 



