@book {1209,
	title = {Systematische Beschreibung der bekannten europaischen zweiflugeligen Insekten},
	volume = {3},
	year = {1822},
	pages = {x + 416 pp., pls. 22-32},
	publisher = {Dritter Theil. Schulz-Wundermann, Hamm.},
	organization = {Dritter Theil. Schulz-Wundermann, Hamm.},
	url = {http://www.biodiversitylibrary.org/item/49298$\#$page/1/mode/1up},
	author = {Meigen, J.W.}
}
@article {518,
	title = {Keys to Nearctic Syrphidae (Diptera)},
	year = {1991},
	pages = {88},
	address = {unpublished keys},
	author = {Thompson, F. C.}
}
