Geometridae : Ennominae
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September Thorn
Ennomos erosaria

([Denis & Schiffermüller], 1775) 1915 / 70.236
Photo © Terry Box, 7 Sep 2007,  SE2064Brimham Rocks, VC64

Similar Yorkshire Species
August Thorn
Ennomos quercinaria
Canary-shouldered Thorn
Ennomos alniaria
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Express Record September Thorn

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Yorkshire Status: Scarce and thinly distributed or restricted resident.

Sutton & Beaumont, 1989: Quite widely distributed in woodland although it often strays to other habitats and seems to spread to upland areas slightly more than the previous species [Dusky Thorn]. Only seems frequent in the centre of the County and parts of the North York Moors.

2012 (CHF): August and September Thorns can be tricky to separate if you are not familiar with them. One tip is that September Thorn holds its wings at a much steeper angle. The two species have quite different distributions in the county with August Thorn in the east and September Thorn in the middle of the county. The range overlaps a little in the south. Despite the names, the flight times are almost identical. Numbers are doing fairly well in the centre of the county.

Recorded in 97 (49%) of 200 10k Squares.
First Recorded in 1883.
Last Recorded in 2022.
Additional Stats

< Dusky Thorn  |  Early Thorn >
Forewing: 17-21mm
Flight: July - October
Foodplant:   Oaks, birches, limes, Beech
Red List Status: Near Threatened (NT)
GB Status: Common
BAP Status: Declining Species (BAP R)
Verification Grade:  Adult: 2
List Species Records   [Show All Latest]
Latest 5 Records
Date#VC10k Area
11/09/2022165SE18 - Middleham
09/09/2022262TA08 - Scarborough
06/09/2022162SE68 - Helmsley
04/09/2022164SE35 - Harrogate / Knaresborough
03/09/2022163SK69 - New Rossington / Austerfield
  Immature   Adult
Show Details | 1990 to 2022 | 2000 to 2022 | Graph Key
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