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1659s1 ~ Yellow Horned ~ Achlya flavicornis
UK Status

Resident. Common N.

Montgomeryshire Status

A fairly common species throughout the county.

Wingspan :  M & F, 39-44mm.

Confusion species

Poplar Lutestring.

Flight time (Montgomeryshire)


Woodland, heathland and moorland.


Silver birch and downy birch.

Lifestage data

Larva mid May-mid July which hide during the day in-between spun leaves. Overwinters as a pupa in a cocoon formed in the leaf litter.
Click map for larger image

Montgomeryshire photos

Photo by PRW, 17th Mar 2007, Commins Coch

Photo by PB, 12th Mar 2011, Morben Isaf