Hairy-Legged Horsefly - Hybomitra bimaculata

    Description

    A medium-large, highly variable horsefly with a body length of 13 to 16.5 mm. Both males and females possess long hair fringes on the anterior and posterior surfaces of the mid tibiae with males also having a posteroventral fringe along the length of the hind tibiae with hairs twice as long as the width of the tibia. This latter feature is useful in separating the species from H. lurida, a scarce bogland horsefly. The abdomen varies from all black individuals to those with extensive orange markings along the flanks of the first three tergites. Females have three dark stripes across the eyes but can be separated from the rarer H. micans by the tibiae which are at least partially pale (all black in H. mican) and a paler abdomen.

    Identification difficulty
    Habitat

    Found in various habitats, including wetlands and open wet woodlands.

    When to see it

    Summer.

    Life History

    The predatory larvae develop in wet soil, wood detritus and even waterbird nests.

    UK Status

    Widespread in the southern half of Britain but seems to be less common further north.

    VC55 Status

    Status in Leicestershire and Rutland not known.

    Leicestershire & Rutland Map

    UK Map