@article {38557,
	title = {The insects and arachnids of Canada, Part 18. The flower flies of the subfamily Syrphinae of Canada, Alaska, and Greenland : Diptera : Syrphidae},
	volume = {Publication 1967},
	year = {1992},
	pages = {460},
	institution = {Agriculture Canada, Research Branch},
	url = {http://www.esc-sec.ca/aafcmonographs/insects_and_arachnids_part_18.pdf},
	author = {Vockeroth, J. R.}
}
