. Fig. 25. Wing of P. xanthopus $. what numerously in flood refuse at the border of a pond in April 1890 (Schlick) and on ^Vs 1910, V2 1913 and ^^4 1914 (Kryger), the imagines emerged on "U—^U- Geographical distribution: — Northern and middle Europe down into Hungaria, towards the north to southern Sweden. Remarks: There can be no doubt that the species is xanthopus^ as it in every respect is quite agreeing; the yellow sides of third and 4*

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Keywords: ., bookauthorlu, bookcentury1900, bookdecade1900, booksubjectdiptera