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Unfortunately, Collin's book is about the only picture-oriented guide to flies around, and as everyone soon learns, it is next to useles for identification. For the time being, there's really no substitute to catching what you have photographed - or photographing what you have caught, which tend to be the easier route.

Swedes is currently working on an "Encyclopedia of the Swedish Flora and Fauna", which aim to procude illustrated identification guides for practically all multicellular species of the country. Mad? Impossible? Fun? Yes! AFAIK only two diptera books are currently being written for the series: Syrphidae and Tachinidae.