St Mark's Fly St Mark's Fly - Bibio marci.
The St Mark's Fly is a very common, long, shiny black fly which can be found in large numbers during the spring around woodland edges, fields and wetlands. It hangs in the air over the vegetation, drifting along with its legs dangling in underneath it. Take on Nature: St Mark's Fly The Bibio marci St Mark's fly on an oak leaf. Males are large-eyed, black-bodied, relatively hairy and usually with a pale wing membrane. When airborne, they fly in a sluggish manner above hedgerows and grass, with their long legs dangling down. During autumn and winter, larvae feed on rotting vegetation which they chew with their strong mouthparts. Bibionid flies (Fever fly, St Mark’s Fly) are stout, black, hairy flies with short wings, ranging from 6 to 10mm long.
In the late summer the Heather Fly (Bibio pomonae) hatches in large number on moorlands: it looks very similar to St Mark's Fly, but the base of its legs is orangey-red. Bibio marci or St. Mark's fly or Hawthorn Fly is a species of fly from the family Bibionidae.It is found across much of Europe.

April - June. Like most bibionid larvae, they grow up in grassy areas and are herbivores and scavengers feeding on dead vegetation or living plant roots. The St. Mark’s Fly has a very short adult life cycle, being in flight for approximately only one week. Bibionids are relatively large and robust nematoceran flies with sexes that differ substantially in appearance. In springtime the males emerge first and the females a few days later.

Species; Additional images ... Named after St. Marks day, 25th April, when they appear with amazing regularity. Swarms of Bibionid flies can sometimes be seen hovering above the lawn on sunny days. Stephen Colton 22 April, 2017 01:00. Adult Fever Fly can be seen from March to October. Biology. Another species is Bibio hortulanus, common in gardens in Spring: in this species, the female is not black but a rich brick red. Their common name comes from the fact that the adults usually emerge around St Mark's Day, 25 April.. Life History.

The majority of their time is spent as larva in the soil.

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