THE " QUICK-WINGED GNAT " 55 



bodies, and what look like very large heads 

 enclosed in a kind of diver's helmet. 



I expect that you will guess that the baby 

 Gnats have now turned to pupae. This is 

 true, but they do not behave in the usual 



A BABY ONAT AFTER IT HAS CHANGED 

 INTO A PUPA. 



way. Instead of quietly resting while their 

 final change is taking place, the Gnat pupae 

 wriggle about just as much as ever. They 

 dive below, plunge about, and paddle them- 

 selves along with two little paddles at the end 

 of their tails. They are just as active as ever, 



