350 



NORTH AMERICAN DIPTKRA. 



Fig. 143. Peckia prtzceps, enlarged. 



TABLE OF GENERA. 



1. First posterior cell closed or much narrowed in the margin. 2 

 First posterior cell open. ....... 5 



2. Second and third abdominal segments with discal and marginal 



macrochaetae. Paramintho. 



Second and third segments without discal macrochaetae. . 3 



3. First vein bristly. ....... Johnsonia. 



First vein bare. ......... 4 



4. Arista bare or pubescent. .... Hesperomyia. 

 Arista distinctly plumose. .... Sarcophilod.es. 



5. Abdomen black or metallic, unicolorousand but slightly pruinose. 6 

 Abdomen gray or partly ochraceous, with black reflecting spots. 8 



6. Hypopygium very prominent; legs more or less hairy. . 7 

 Hypopygium concealed; legs not hairy; curvature of fourth vein 



with an obtiise angle and without stump. . . Onesia. 



7. Abdomen usually black; tibiae densely hairy. . . Peckia. 

 Abdomen metallic; tibiae with short hairs (see Muscidae). 



Cynomyia. 



