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Bibio hortulanus (Linnaeus, 1758) and Bibio marci (Linnaeus, 1758)

Bibio hortulanus Bibio hortulanus Bibio hortulanus
Left: Male, Cambridge 13 Apr 2002.
Centre: Female, Cambridge 16 Apr 2002.
The males are smaller than in B. marci (below), and the females are distinguished by the red-brown thorax.
Bibio marci Bibio marci (St Mark's fly)
Male, Cambridge 5 May 2001.
The larger male - the females are all black, and appear on or about St Mark's day, (25th April) hence both the popular and scientific name of the species.

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