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- (old) Key to the Syrphidae of the southeastern US
- Key overview of syrphidae for Slovenia
- Fantastic character overview of diptera!
- Miranda, G.F.G, Young, A.D., Locke, M.M., Marshall, S.A., Skevington, J.H., Thompson, F.C. 2013. Key to the Genera of Nearctic Syrphidae. Canadian Journal of Arthropod Identification No. 23, 23 August, 2013. Available online at doi: 10.3752/cjai.2013.23
- Picture key of the genera of Syrphidae (Diptera) from the Brazilian Amazon
- Key to some Vietnam speciesm but I guess you can find way more species than listed in the key