The middle tibiae of C. viduatus are distinctly yellow-brown. the female eyes are green with severa purple spots whilst the male eyes are entirely green, turquoise or coppery, without spots. The second abdominal segment is yellow with a well-defined quadrate black spot. The female eyes are green with several purple spots whilst the male eyes are entirely green, turquoise or coppery, without spots. Chrysops viduatus occurs in wet meadows, mires, fens and wet woodlands. The larvae feed on organic matter in wet peaty detritus.
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