gio 



FRESH-WATER BIOLOGY 



Fig. 1378. Typical wing venation in the aquatic families of the Diptera. 



a, Psychoclidae Moth flies h, Tabanidae Horse-flies 



b, Tipulidae Crane-flies , i, Stratiomyidae Soldier flies 



c, Blephoceridae Net-winged midges 



d, Dixidae 



e, Culicidae 



/, Chironomidae 

 g, Simuliidae 



Dixa-midges 

 Mosquitoes 

 Midges 

 Black-flies 



j, Leptidae Snipe-flies 



k, Dolichopodidae Dolichopods 



I, Fmpididae The empids 



m, Syrphidae Syrphus flies 



M, Muscidae (5, lat.) 



in the Chironomidae, Tipulidae, etc., or even to enter into detailed 

 statements as to their habits. A few of the families are compara- 

 tively small and unimportant. The moth flies (Psychodidae) are 

 very minute, being among the smallest of flies, and live as larvae 



