Erebidae : Lymantriinae
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Photo © Ben Sale,  Scales Park, Hertfordshire (08/07/17) - Female

Immature stages

Similar Herts & Middlesex Species
Gypsy Moth
Lymantria dispar
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Black Arches
Lymantria monacha

(Linnaeus, 1758) 2033 / 72.010

General comments:
Widespread and usually common resident.

The Black Arches has not always been widespread in Hertfordshire, but during 1997 and 1998 it started to expand its range. It is now relatively widespread, but more or less confined to mature woodlands, where Hornbeam, rather than the expected oak, seems to be the principal larval foodplant. Other than the fully melanic form, which ias frequent in the Broxbourne Woods complex, adults vary considerably in the extent of their black markings and these varieties can be found in most places in the two counties.

Recorded in 37 (90%) of 41 10k Squares.
First Recorded in 1893.
Last Recorded in 2023.
Additional Stats

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List Species Records   [Show All Latest]
Latest 5 Records
Date#VC10k Area
08/10/2023120TL23 - Letchworth / Baldock
20/09/2023120TL23 - Letchworth / Baldock
18/09/2023120TL23 - Letchworth / Baldock
26/08/2023120TL22 - Stevenage
26/08/2023120TL42 - Bishop's Stortford (N)
Show Details | 1990 to 2023 | 2000 to 2023 | Graph Key
Express Record Black Arches
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VC20 VC21 VC21 VC20
Click Map for Details
Forewing: 18-28mm
Flight: One generation July - August
Foodplant:   Oak
Red List: Least Concern (LC)
GB Status: Common
Former Status: Local
Verification Grade:  Adult: 1
 Immature Adult   [Show Flight Weeks]
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