Caloptilia semifascia

    Alternative names
    Maple Slender

    Wingspan 10 to 12 mm. The angled light streak starting at the leading edge of the forewing is characteristic, but it can be obscured on darker specimens.

    Identification difficulty

    Adult Leafmine

    ID guidance

    Leafmine occurs on various Maples and on Sycamore.


    Usually restricted to localities where Field Maple is common.

    When to see it

    Flies from late July to October and again, after hibernating, until May.

    Life History

    The larva feeds on field maple in June and July and, occasionally, in late August and September. At first it inhabits a leaf mine, then a leaf cone and, finally, a sequence of two leaf rolls.

    UK Status

    It is widespread in southern England and South Wales, but Outlying populations occur in Caernarvonshire-Denbighshire and in Cumbria-Yorkshire. In the Butterfly Conservation's Microlepidoptera Report 2011 this species was classified as local.

    VC55 Status

    It appears to be uncommon in Leicestershire and Rutland, where there are few records. L&R Moth Group status = D (rare or rarely recorded).

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    Leicestershire & Rutland Map

    MAP KEY:

    Yellow squares = NBN records (all known data)
    Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

    UK Map