ADAPTATIONS JO HAUNTS AND SEASONS 305 



Similarly another familiar member of the Lepidoptera, the 

 Death's Head Moth {Acherontia atropos) im^ades the country 

 every summer in numbers ; its caterpillars are hatched, 

 grow, and pupate in the soil, but the combined coolness 

 and damp of our winters apparently kill them all. The 

 migrant powers of such insects give promise of wide 

 extension of their permanent range, but such promise is 

 unfulfilled if they cannot adapt themselves throughout the 

 year to the climatic conditions of the occupied territory. 



