FRESH-WATER BIOLOGY 



n 



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 j, Leptidae Snipe-flies 



Dixa-midges k, Dolichopodidae Dolichoppds 



Mosquitoes I, Empididae The empids 



m, Syrphidae Syrphus flies 



n, Muscidae (s, lat.) 



d, Dixidae 



e, Culicidae 



/, Chironomidae Midges 

 g, Simuliidae Black-flies 



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 



