Erebidae : Erebinae
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Photo © Charles Sayer,  07/10/2019 - Sparham

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Similar Norfolk Species
Red Underwing
Catocala nupta
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Clifden Nonpareil
Catocala fraxini

(Linnaeus, 1758) 2451 / 72.076
=Blue Underwing

Norfolk status
Rare immigrant. Recent resident.
This is the Victorian collector's classic all-time favourite, often named the 'Blue Underwing'.

Up until recently (2019+) all modern-day Norfolk records were of assumed migrants, recorded mainly along the coast, usually in late August - September. It is now thought to be resident.

According to Heath (MBGBI V.10, 1983), in around 1935 C. fraxini is believed to have been resident for some years in north Norfolk, but its occurrence there is not documented. Other publications including Skinner (MBI,1984) mention it as being resident in the Norfolk Broads from the early to mid 1930s. In the New Naturalist edition: The Broads 1965, Ted Ellis notes it as possibly breeding in the district occasionally ( e.g. on poplars near Barton Broad, where the moths appeared annually in fair numbers for several years in succession in the 1930s). The original source of this information is unfortunately unknown, and we have no C. fraxini records from Barton Broad or the 1930s.

In 1976 a remarkable seven specimens were recorded in Norfolk, a very rare occurrence in the UK at the time. It was not recorded in large numbers again until 2019, when ten confirmed and one unconfirmed were recorded, the most ever in Norfolk on record in a single year. In 2020 this record was smashed with 42 adults recorded and in 2021 a remarkable 124 adults from across Norfolk. The species is now thought to be breeding once again in Suffolk, and with huge numbers recorded recently, it appears to be locally breeding again(?) in Norfolk. [JW]

The larvae are nocturnal canopy feeders on mature Populus spp. and Aspen and are seldom seen, being out of reach to recorders.

Records of immaculate specimens seen before the end of August are questionable as this species is often captive bred.

Please photo, preferably showing the blue underwing for confirmation.

Recorded in 61 (82%) of 74 10k Squares.
First Recorded in 1834.
Last Recorded in 2023.
Additional Stats

< Beautiful Marbled | Red Underwing >

The Clifden Nonpareil in Norfolk 1976 - E.A. Ellis. Ent. Rec. 88. 1976.
List Species Records   [Show All Latest]
Latest 5 Records
Date#VC10kGeneral Area
19/10/2023327TG32East Ruston / Crostwight Heath
Show Details | 1990 to 2023 | 2000 to 2023 | Graph Key
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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Forewing: 41-48mm.
Flight: One generation Aug-Oct.
Foodplant:   Aspen, poplars
Red List: Least Concern (LC)
GB Status: Not Assessed / Immigrant
Former Status: Immigrant
Verification Grade:  Adult: 1
 Immature Adult   [Show Flight Times]

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Underlying maps using Digital Map Data © NOLA™ 2024. © Lepidoptera UK - Jim Wheeler - Norfolk Moths 2007 - 2024. Data © NOLA™ 2024
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