322 



NORTH AMERICAN DIl'TERA. 



The members of this family are usually found in mead- 

 ows, along the banks of small streams, etc., wherever it 

 is moist. They are, for the most part, brown or brownish 

 yellow in color, oftentimes with pictured wings. They 

 are slow in their habits. The larvae are slender, cylin- 

 drical, thin anteriorly; the last segment with six or eight 

 conical, fleshy tubercles. They are aquatic. 



Fix. I2 9- Sciomyzidae. i, Sepedon, wing; 2, Sepedon, hind leg; 

 3, Sepedon, head; 4. Tetanocera, Wing; 5, Tetanocera, head; 6, Scio- 

 myza, \vinj4; 7, Sctomyza, head; S, Thecpmyia, head; 9, Trigonome- 

 topus, head. 



