@inbook {1809,
	title = {Fam. Syrphidae},
	booktitle = {Biologia Centrali Americana, Zoologia - Insecta - Diptera},
	volume = {3},
	year = {1891},
	pages = {1-56; 57-72; 73-78, pl. 1, 2, figs. 1-12},
	address = {London},
	url = {http://www.sil.si.edu/digitalcollections/bca/navigation/bca_16_03_00/bca_16_03_00select.cfm},
	author = {Williston, S.W.},
	editor = {Godman, F.D. and Salvin, O.}
}
