312 INSECT ARTIZANS AND THEIR WORK 



A minute species of Fire-fly (Photurus pennsyl- 

 vanicus), common in the Eastern United States, 

 has wings in both sexes. It is yellowish in colour, 

 with a few ill-defined lines of brown or black. In 

 the Mississippi Valley its place is taken by Photinus 

 pyralis. Its larva lives upon earth-worms and 

 soft-bodied insects, which it hunts for underground. 



