THE LACE-WING FLY 1 29 



Almost any swarm of aphides will show us this 

 fat wolf in the fold, and if not this particular one, 

 another — perhaps two others — quite as voracious, 

 one of them the fat larva of the lady-bug, and the 

 other a tapering- looking grub with needle beak 

 and insatiable hunger, the larva of the gold- 

 banded flower-fly. 



