Lesser Swallow Prominent Pheosia gnoma: Distribution map

Please note that the NBN Gateway map service has been terminated as of 1 April 2017.

As soon as a replacement map service is available, distribution maps will hopefully appear here again.

In the meantime, you can get some idea of distribution from the NBN Atlas website.

View the NBN Atlas Map

71.018 BF2006
Lesser Swallow Prominent Pheosia gnoma

(Fabricius, [1777])


Wingspan 45-50 mm.

A fairly common moth throughout most of Britain, this species is very similar to Swallow Prominent (P. tremula), but can be identified with care. Compared to that species, gnoma has a more distinct white wedge at the tornus of the forewing, and lacks the wavy white line in the blackish area of the hindwing.

Northern forms can show a chocolate brown head and thorax, in contrast to the typically paler-headed forms further south.

There are two generations, on the wing in May and June, and later in August. The larvae feed on birch (Betula).

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