Ball, S.G., 2008
Colour Key to the Tribes of the Syrphidae
Unpublished key to tribes of Syrphidae Flies (Hoverflies)
Downloadable from the members area of the Diperists Forum website. (See the instructions on this site's review page for the Dipterists Forum Website.)
||Colour photographs and line drawings.
||Under a Stereo Microscope.