Prev Flights Rec Search
September Thorn
Ennomos erosaria ([Denis & Schiffermüller], 1775)
Geometridae: Ennominae
1915 / 70.236
Photo © Peter Tilley

Tetrad Map
Google Map

Similar Species
August Thorn
Ennomos quercinaria
Canary-shouldered Thorn
Ennomos alniaria
Forewing: 17-21mm.
Flight: One generation July-Oct.
Foodplant:   Oaks and birches. limes, Beech.
Red List: Near Threatened (NT)
GB Status: Common
Verification Grade:  Adult: 2
Status
Local but infrequent, scarce in recent years.
Woodland and gardens.

Very similar to August Thorn. August Thorn has white "socks" on each leg, and a flat resting posture, which separates it from the similar September Thorn. (September Thorn rests with wings raised)

Recorded in 47 (64%) of 74 10k Squares.
First Recorded in 1873.
Last Recorded in 2024.
Additional Stats
Latest 10 Records
Date#VC10kArea
30/09/2024127TG33Ridlington
21/09/2024127TG10Cringleford (UEA)
20/09/2024127TG20Norwich (Lakenham)
06/09/2024+27TG23Thorpe Market / Gunton
27/08/2024128TL99Griston / Northacre
16/08/2024128TF93Little Walsingham
13/08/2024127TG10Cringleford (UEA)
12/08/2024+28TL99Thompson Common
11/08/2024128TM09Great Ellingham
02/08/2024128TL99Griston / Northacre
Further info: Ennomos erosaria
 
UK Moths
British Lepidoptera
NBN Atlas
Moth Dissection UK
Svenska fjarilar
Lepiforum.de
Bedfordshire Moths
Cambs Moths
Devon Moths
Dorset Moths
Essex Field Club
Hants Moths
Herts & Middx Moths
Huntingdon HMBG
Kent Moths
Norfolk Moths
Somerset Moths
Suffolk Moths
Upper Thames Moths
West Midlands Moths
Yorkshire Moths
Norfolk Moths (Full)
Back Record Home
iMoths V14.3 HD © Lepidoptera UK 2025
This web app requires necessary cookies to function correctly. We'd also like to set Google analytics cookies that help us make improvements by measuring how you use the site. These will be set only if you accept all cookies. Necessary cookies enable core functionality such as security, network management, and accessibility. You may disable these by changing your browser settings, but this will affect how the website functions. Cookies Policy