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September Thorn
Ennomos erosaria ([Denis & Schiffermüller], 1775)
Geometridae: Ennominae
1915 / 70.236
Photo © Neil Sherman,  Harlow, Essex. July 2015

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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: 3
Status
Morley's Final Catalogue: Scarce, but widespread. Sudbury (Ransom), Freston, Ipswich, Brandeston, Swefling, Aldeburgh, Lowestoft in August (Ent. 1922, 258), Fritton, Beccles, Flixton, Bungay at light; Needham, West Stow; Tuddenham Fen in August 1928 (Mly), Brandon.

Recent Suffolk Status: Formerly a local species but now quite rare in the county with very few recent records. Photos may be requested to confirm records.

Life history: Single-brooded.

Identification: August thorn rests with wings held flatter. Canary-shouldered thorn normally has the bright yellow thorax, but beware specimens with a buff thorax which can resemble September thorn. The outer cross line is straighter in September thorn.

Habitat: Woodland, parkland, gardens.

Retained Specimen / Photograph will be Required.

Recorded in 34 (59%) of 58 10k Squares.
First Recorded in 1922.
Last Recorded in 2024.
Additional Stats

Latest 10 Records
Date#VC10kArea
29/09/2024125TM47Blythburgh/Dunwich
24/09/2024125TM57Southwold
23/09/2024125TM57Southwold
31/08/2024125TM03East Bergholt
08/08/2024125TM24Woodbridge/Martlesham
22/10/2023125TM58Carlton Colville/Kessingland
15/08/2023125TM23Felixstowe/Landguard Point
09/08/2023125TM24Woodbridge/Martlesham
07/08/2023125TM13Brantham/Holbrook
14/08/2021126TM07Thelnetham/Redgrave
Further info: Ennomos erosaria
 
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