SYRPHICT. 53 



sexmaculatus Pal. St. Domingo, Southern States. Pal. Beauvois. 



Ins. p. 224. Dipt. tab. iii, fig. 8. 



x. b. This species evidently belongs to some other genus. 



sexquadratus Walk. Hucls. Bay, Nova Scotia. Walker, List, etc. 



Ill, 586. 



simulatus Harris. Cat. Ins. Mass. 



stegnus Say. Mexico. Say, J. Acad. Phil. VI, 163, 1. 



strigatus Stfeger. Greenland. Steeger, Greenland's Antliater (Sphae- 



rophoria) . 



tarsatus Zett. Greenland. Zetterstedt, insecta lapponica. Stseger, 



Greenland's Antliater. 



teretus Harris. Cat. Ins. Mass. 



topiarius Meig. ^Europe (aut.); Huds. Bay, New York (Walk.); Green- 

 land (Stagger). Meigen, Zetterstedt, etc. Stagger, Greenland's Ant- 

 liater. Walker, List, etc. Ill, 582. 



ximbellatarum Fab. Europe (aut.) ; Nova Scotia (Walk.). Fabri- 



cius, Meigen, Zetterstedt, etc. Walker, List, etc. Ill, 587. 



vittatifrons Harris. Cat. Ins. Mass. 



Ocyptareims Serv. 



fusc?.pennis Macq. Philadelphia. --Macq. Hist. Nat. Dipt. I, 554, 2, 



tab. xii, fig. 13. 



SericomySa Meig. 

 chrysotoxeide3 Macq. Philadelphia. Macq. Dipt. Exot. II, 2, 19, 1. 



Mem. de Lille, 1841, p. 79, tab. iii, fig. 3, bis. 



filia Walk. Huds. Bay, Nova Scotia. Walker, List, etc. Ill, 596. 



lappena Lin. Europe (aut.); Greenland (Fab.). Linne, etc. 0. Fa- 



bricius, Fauna Grcenl. p. 208, 169. 

 limbipennis Macq. Nova Scotia. Macq. Dipt. Exot. 2e Suppl. p. 



58, 2. Mem. de Lille, 1846, p. 74 ("perhaps $ of S. Ckrysotoxoides?" 



Macquart) . 



militaris Walk. Huds. Bay, Nova Scotia. Walker, List, etc. Ill, 595. 



sexfasciata Walk. Huds. Bay. Walker, List, etc. Ill, 596. 



tuberculata Harris. Cat. Ins. Mass. 



Tropsdia Meig. 



albistylum Macq. North America. Macq. Dipt. Exot. 2e Suppl. 



p. 60, 1. Mem. de Lille, 1846, p. 76, tab. ii, fig. 10. 



x. b. Macquart also refers to this genus Xylota quadrata Say (vid. 



Xylota). 



Polydonta Macq. 



bicolor Macq. Nova Scotia. Macq. Dipt. Exot. 4e Suppl. p. 144, 1. 



Mem. de Lille, 1849, p. 448, tab. xiii, fig. 6. 



Merodon Latr. 

 Balauus Walk. New York. Walker, List, etc. Ill, 600. 



