SYNOPSIS OF NORTH AMERICAN SYRPHID^. 283 



The American fossil species already described are the following: 

 Eristalis lapideus Scndder, Bull. U. S. Geol. Surv., iii, 756. 



Based upon an imperfect specimen, and, as before stated, probably 

 not belonging to this genus. 



Milesia quadrata Scudder, Bull. U. S. Geol. Surv., iv, 752. 



Probably not a Milesia ; see remarks on previous page. 

 Chilosia ampla Scudder, Bull. U. S. Geol. Surv., iv, 753. 



Most probably a true Chilosia. 



CHRONOLOGICAL LIST OF GEN"ERA. 



In the following list I have endeavored to give all the generic names 

 hitherto proposed in the family of Sijrphidw, arranged chronologically. 

 Such names as I believe to be well founded, or which I cannot find any 

 reliable data as to their synonymy, are printed in heavj^ type, in order to 

 distinguish them from those which are believed to be synonymous. The 

 latter, printed in italics, it will be observed, are preceded by numbers 

 indicating their synonymy. Undoubtedly from among the former others 

 will yet be shown to be synonyms, and from the latter not a few may 

 be finally accepted as subgeneric, or as applying to species sufficiently 

 distinct to justify their use. I have given, in brackets, such of the various 

 spellings as I have been able to find. The habitats given are of the type 

 species. 



1763. 



1. — Rhingia \_Rhyngia'\ Scopoli, Eutora. Carniol., 358. Europe. 



1764. 

 2. — Volucella Geoffroy, Hist, des iusectes des environs de Paris, it. 



1775. 

 3. — Syrphus Fabricius, Syst. Entom., 762. Europe. 



1794. 

 4. — Ceria Fabricius (non Scopoli, 1763), Entom. Syst., iv, 277. Europe. 



1801. 

 2. — Cenogaster Dum^rill, Expos, et diet, d'hist. uat. Europe. 



1803. 

 5. — Chrysotoxum Meigen, in Illiger's Mag., ii, 259. Europe. 

 6. — Spilomya \_Spilomyia, Spi/Iomyal Meigen, ibid., 273. Europe. 

 23. — HeliopMlus Meigen, ibid., ii, 273. Europe. 

 7. — Chrysogaster Meigen, ibid., 274. Europe. 

 8. — Doros Meigen, ibid., 274. Europe. 

 9. — Sericomya [mj/m, rni/^a] Meigen, ibid., 274. Europe.. 

 10. — Elophilus {^Helophilusl Meigen, ibid., 274. Europe. 

 11. — Merodoii Meigen, ibid., 274. Europe. 

 12. — Microdon Meigen, ibid., 275. Europe. 

 2. — Pterocera Meigen, ibid. Europe. 



1804. 

 13. — Psarus Latreille, Hist. nat. Crust et Ins., xiv, 357. Europe. 

 12. — Aphriiis Latreille, ibid., 358. Europe. 

 14. — Paragus Latreille, ibid., 359. Europe. 

 15. — Milesia Latreille, ibid., 361. Europe. 

 16. — Eristalis Latreille, ibid., 363. Europe, 



