FIELD BOOK OF PONDS AND STREAMS 



Fig. 234. — Net-veined midge, Blepharocera: i, 

 larva, dorsal side; 2, ventral side showing gills and 

 the six suckers by which it clings to the stone; 3, 

 pupa showing gills; 4, adult. 



Horse-flies, Family Tabanidse. — Tabanid larvae (Fig. 235) 

 live in stagnant, scummy water close to shore, sometimes in 

 damp earth. They are half an inch long, whitish and worm- 

 like, taper at both ends, and have roughened ridges running 

 around the body. They breathe air usually through a pair 



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Fig. 235. — Horse-fly, Chrysops niger: i, larva 

 showing openings of air-tubes; 2, adult. 



298 



