Geometridae : Archiearinae
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Photo © Ben Sale,  Bramfield Woods, Hertfordshire (15/04/19)

Similar Herts & Middlesex Species
Light Orange Underwing
Archiearis notha
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Orange Underwing
Archiearis parthenias

(Linnaeus, 1761) 1661 / 70.203

General comments:
Very local resident.

This day-flying moth flits about the tops of birch trees on sunny afternoons in March and early April. Sometimes it will descend to ground level where it may settle on a sunlit patch, but more often than not it keeps a healthy few centimetres beyond the reach of the net, which is unfortunate since separation from the near identical Light Orange Underwing requires careful examination (note that males are immediately separated by their antennae). The different foodplants are of help, but are not absolute as both species may affect both birches and Aspen. The apparent notion that the removal of tall birches from woodlands is beneficial in some way to the long-term woodland structure is ill-conceived and does little to allow this insect to thrive.

Recorded in 17 (41%) of 41 10k Squares.
First Recorded in 1887.
Last Recorded in 2022.
Additional Stats

< Early Tooth-striped  |  Light Orange Underwing >

List Species Records   [Show All Latest]
Latest 5 Records
Date#VC10k Area
24/03/2022120TL31 - Hertford
25/05/2020121TQ29 - Barnet / Finchley
07/04/2020121TQ29 - Barnet / Finchley
04/04/2020120TL31 - Hertford
24/03/2020120TL30 - Hoddesdon / Cheshunt
Show Details | 1990 to 2023 | 2000 to 2023 | Graph Key
Express Record Orange Underwing
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VC20 VC21 VC21 VC20
Click Map for Details
Forewing: 16-19mm.
Flight: One generation. Mar-April.
Foodplant:   Downy Birch, Silver Birch
Red List: Least Concern (LC)
GB Status: Common
Former Status: Local
Verification Grade:  Adult: 1
 Immature Adult   [Show Flight Weeks]
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