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.
Leafmine occurs on various Maples and on Sycamore. http://www.leafmines.co.uk/html/Lepidoptera/C.semifascia.htm
Usually restricted to localities where Field Maple is common.
Flies from late July to October and again, after hibernating, until May.
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.
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.
It appears to be uncommon in Leicestershire and Rutland, where there are few records. L&R Moth Group status = D (rare or rarely recorded).
Leicestershire & Rutland Map
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