366 



NORTH AMERICAN DIPTERA 



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Chamjemyidfe. — 1, Acrometopia maculata ; 2, Leucopis major; 3. Cryptochsetum iceryae; 

 4, Pseudodinia polita chsetotaxy : 5. Cryptochietuin iceryae; 6, Ochthiphila polystigma; 7, 

 Ochthiphila, chsetotaxy ; 8. Pseudodinia polita; 9. Plunomia elegans, chaftotaxy ; 10, Acrome- 

 topia maculata; 11, Plunomia elegans; 12, Ochthiphila polystigma ; 13, Leucopis major. 



