346 Professor Williston on the 



SYRPHID^.* 



Mekomacrus. 

 Rondanij Esam. di var. sp, Ins. Bras., 10, 1848. 



1. Meromacrus pratorum. 



Syrphus 'prntornm, Fabricius, Syst. Ent., 765; Eiifc. 



S.yst., iv., 286. 

 EristaUs pratorum, Fabricius, Syst. Antl., 236 ; 



Wiedemann, Auss. Zw. Ins., ii., 166. 

 Pteroptild pratorum, Osten Sacken, Catalogue, 113 ; 

 Williston, Synopsis, 183. 



Twelve specimens. Wiedemann's description applies 

 well, save that it is not stated that the sutural thoracic 

 band is interrupted. The species will be distinguished 

 from M. ruficrus by the separated spots at the base of 

 the abdomen ; from all the other known species by the 

 entirely yellowish red legs. 



Erfstalis. 

 Latreille, Hist. Nat. des Crust, et Ins., xiv., 363, 1804. 



1. Eristalis vineforum. 



Syrphns vinetorum, Fabricius, Ent. Syst. Suppl., 562. 



Eristalis vinetorum, Fabricius, Syst. Antl., 235; 

 Wiedemann, Auss. Zw. Ins., ii., 163; Macquart, 

 Dipt. Exot., ii., 2, 42 ; Williston, Synopsis North 

 Amer. Syrphidas, 171, pi. vii., fig. 8 ; Trans. Amer. 

 Ent. Soc, XV., 280 ; Biologia Centr.-Amer. Dipt., 

 iii., Q'6 ; F. Lynch, A. Dipt. Argentina, Syrphidas, 

 116; Giglio-Tos, Dit. Messic, ii., 7. 



Eristalis trifasciatus, Say, J. Acad. Sci. Phil., vi., 



165 ; Compl. Wr., ii., 359. 

 Eristalis uvariim, Walker, List, iii., 623. 



Hah. North, Central and South America, and the 

 West Indies. 



- By S. W. Williston. 



