10 



LIST OF DIPTEKA. 



7. Beris geniculata. 



Cyaneo -viridis ; caput nigro-viride ; antennarum articulus 3us fer- 

 rugineus ; scutellum spinis viridibus ; abdomen nigrum ; pedes 

 nigri, genubus fulvis ; alee maris nigricantes, fceminae cinereee. 



Beris geniculata, Holiday ; Curt Brit. Ent. 337. 

 a. England. From Mr. Stephens' collection. 



North America. 

 8. Beris quadridentata. 

 Beris quadridentata, Cat. of Diptera, Pt. 1, 127. 



9. Beris lata. 

 Beris lata, Cat. of Diptera, Pt. 1, 127. 



10. Beris brevis. 

 Beris brevis, Cat. of Diptera, Pt. 1, 127. 



11. Beris viridis. 



Viridi-eenea ; antennee flavee, apice nigro-fuscee ; scutellum spinis 

 quatuor flavis ; abdomen nigro-fuscum, fiavo marginatum ; 

 pedes flam, tarsis basi et tibiis posticis apice fuscis ; alee hya- 

 lines, basi flavescentes. 



Beris viridis, Say, Long's Exped. to St. Peters River, Append. 368, 

 1. Wied. Auss. Zweifl. i. 83, 2. J.oew, Ent. Zeit. Stett. vi. 305, 

 10. 



Pennsylvania. 



12. Beris dorsalis. 



Nigra ; antenna basi flavescentes ; abdomen basi medio flavidum ; 

 pedes flavidi, tibiis anticis et posticis supra nigro-fuscis ; alee 

 apud costamfuscee. 



Sargus dorsalis, Say, Long's Exped. Append. 377, 4. 

 Beris dorsalis, Weid. Auss. Zweifl. i. 540, 3. Loew, Ent. Zeit. 

 Stett. vi. 306, 11. 



Pennsylvania. 



