Geometridae : Ennominae
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Photo © Ben Sale,  Stevenage, Hertfordshire (23/09/13)

Similar Herts & Middlesex Species
August Thorn
Ennomos quercinaria
Canary-shouldered Thorn
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Large Thorn
Ennomos autumnaria

(Werneburg, 1859) 1911 / 70.232

General comments:
Extremely local resident. Declining. Species of Conservation Concern.

Our area lies on the south-western edge of the broader national range of this striking moth, and that is clear explanation for its strong north-east bias here. However, records are few and it appears to be on a downwards trend; this may be natural range contraction (the map shows we really are right on the edge), but it should be monitored in case there are more sinister reasons for the decline.

Recorded in 8 (20%) of 41 10k Squares.
First Recorded in 1931.
Last Recorded in 2017.
Additional Stats

< Lilac Beauty  |  August Thorn >

List Species Records   [Show All Latest]
Latest 5 Records
Date#VC10k Area
04/09/2017120TL23 - Letchworth / Baldock
20/09/2015120TL22 - Stevenage
20/09/2015120TL22 - Stevenage
23/09/2013120TL22 - Stevenage
30/09/2012120TL22 - Stevenage
Show Details | 1990 to 2023 | 2000 to 2023 | Graph Key
Express Record Large Thorn
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VC20 VC21 VC21 VC20
Click Map for Details
Forewing: 21-28mm.
Flight: One generation Sept-Oct.
Foodplant:   Broadleaved trees
Red List: Near Threatened (NT)
GB Status: Common
Former Status: Nationally Scarce B
Verification Grade:  Adult: 2
 Immature Adult   [Show Flight Weeks]
© hertsmiddxmoths.uk 2024 NOLA®; Database using MapMate® Digital Maps © Bartholomew 2010. Design © Jim Wheeler 2024
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