@article {6422,
	title = {Synopsis of the dipterous genus Thereva},
	journal = {Canadian Entomologist},
	volume = {25},
	year = {1893},
	pages = {5},
	chapter = {197},
	url = {http://www.biodiversitylibrary.org/page/3062127},
	author = {Coquillett, D. W.}
}
