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Light Orange Underwing
Archiearis notha (Hübner, 1803)
Geometridae: Archiearinae
1662 / 70.204
Photo © Garry Barlow,  Oversley Wood, Warks 03042016

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Similar Species
Orange Underwing
Archiearis parthenias
Forewing: 15-17mm.
Flight: March - April.
Foodplant:   Aspen.
Red List: Least Concern (LC)
GB Status: Nationally Scarce
Former Status: Nationally Scarce B
Verification Grade:  Adult: 3
Status
Scarce.
Occurring locally in the southern half of England.

Known from one site in Norfolk (confirmed in 2021, Phil Heath) Recent investigations by Phil have uncovered previously unknown reports of regular sightings at this site, possibly since the 1960s!

Identification can be made by differences in the male antennae, which are finely serrated in Orange Underwing and slightly feathered in Light Orange Underwing.
The underside of the hindwing of Orange Underwing shows an orange band that projects centrally into a dark outer band, often reaching outer margin. Light Orange Underwing shows a dark outer band that is is unbroken, and the central projection of the orange band is absent. (MBGBI Vol 7 part 2)

Barrett [VCH 1901] Brephos notha, Hb.
" Has been taken at Horsford near Norwich"

(Note 2021 genus name change to Archiearis)

Retained Specimen / Photograph will be Required.

Recorded in 3 (4%) of 74 10k Squares.
First Recorded in 1873.
Last Recorded in 2023.

Latest 10 Records
Date#VC10kArea
19/04/2023127TG02Foxley Wood
23/04/20211027TG02Foxley Wood
1914+28TF60Downham / Fincham
1907128TF60Shouldham
1873 to 1913+27TG11Horsford
Further info: Archiearis notha
 
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