II 



FLIES WITH AQUATIC LARVAE 



145 



our window-panes, and would be called a Gnat by 

 most people. It can be easily distinguished from a 

 true Gnat, by its habit of raising the fore-legs from 



FlG. 43. Fly of Chironomus. A, male fly ; B, female fly ; C, antenna of male ; 



D, antenna of female. 



the ground when at rest. Gnats under like circum- 

 stances often keep the hind-legs raised. The Chir- 

 onomus fly is entirely harmless, and the mouth-parts 

 can neither pierce nor suck. Like many other Diptera, 



