THE LACE-WING FLY 129 



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 oold- 

 banded flower-fly. 



