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70.233 (BF1912)

August Thorn   

Ennomos quercinaria
Adult: 2
Resident, rare, fairly widespread. UK BAP Priority Species. Widespread but local in England and Wales north to Lancashire and Yorkshire. In Scotland mostly in Dumfries and Galloway with a very thin scattering of old records to Perthshire.


Great care is needed in identifying this very scarce species from other thorns. It is very similar to September Thorn, but this species holds it wings at a lower angle than other thorns when at rest. Also, outer cross-line on the forewing is kinked at the costa, with the inner one having a more pronounced angle at the costa. A quality picture or specimen required for record acceptance.

Recording method

Comes to light.

Life cycle

One generation. Overwinters as an egg. Pupates among leaves of the foodplants, mainly oaks.

Larval foodplants

Pedunculate Oak, limes and Small-leaved Elm.


Woodland and parkland.


First recorded for Dumfries and Galloway in 1862 for VC73 at Terregles by Lennon who said it was ‘not common’, in 1895 for VC74 at Monreith by Maxwell who caught ‘six specimens flying at dusk’ but not until 1999 for VC72 at Durisdeer by Caroline Allan.

66 record(s) from 21 hectad(s) in D&G

VC74 VC73 VC72
Last recorded 2020 2022 2021

 UK Moths website - further information on species (with photos)

 East Scotland Butterfly Conservation website - national distribution maps and phenology

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