Geometridae : Ennominae
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Photo © Neil Sherman,  Harlow, Essex. July 2015

Immature stages

Similar Suffolk Species
August Thorn
Ennomos quercinaria
Canary-shouldered Thorn
Ennomos alniaria
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September Thorn
Ennomos erosaria

([Denis & Schiffermüller], 1775) 1915 / 70.236

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 2023.
Additional Stats

< Dusky Thorn  |  Early Thorn >

List Species Records   [Show All Latest]
Latest 5 Records
Date#VC10k Area
22/10/2023125TM58 - Carlton Colville/Kessingland
15/08/2023125TM23 - Felixstowe/Landguard Point
09/08/2023125TM24 - Woodbridge/Martlesham
07/08/2023125TM13 - Brantham/Holbrook
14/08/2021126TM07 - Thelnetham/Redgrave
Show Details | 1990 to 2023 | 2000 to 2023 | Graph Key
Express Record September Thorn
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Copyright © Jim Wheeler 2024

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Forewing: 17-21mm.
Flight: One generation July-Oct.
Foodplant:   Oaks and birches limes, Beech
Red List: Near Threatened (NT)
GB Status: Common
BAP Status: Declining (Research only)
Verification Grade:  Adult: 3
 Immature Adult
Underlying maps using Digital Map Data © Norfolk Online Lepidoptera Archive - NOLA™ - Suffolk 2024. © James Wheeler - Norfolk Moths 2007 - 2024. Data © NOLA™ - Suffolk 2024
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