THE MIGRATIONS OF INSECTS 71 



years accompanied ships into most quarters of the 

 globe, and become a colonist, like the brown rat 

 or the cockroach. The large Oriental cockroach 

 is now firmly established in this country. In return 

 for this doubtful blessing we have sent to New 

 Zealand the humble-bee to fertilise the antipodean 

 clover, and are, it is said, about to export ladybirds 

 to eat the blight on the vines of Australia. 



