Posted by John Bratton on 23-12-2023 12:09
#1
Swept from Carex by Llyn y Cwn, an upland lake above Cwm Idwal, North Wales, 16 August 2023. It keys to C. means using Fonseca 1968 RES Handbook. But the cercal plate, second photo, looks more like the drawing of C. intermedia in Gregor et al. Muscidae of Central Europe.