Erebidae : Erebinae
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Photo © Charles Sayer,  03/09/2019 - 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.
This is the Victorian collector's classic all-time favourite, often named the 'Blue Underwing'.

Modern-day Norfolk records are of assumed migrants, recorded mainly along the coast usually in late August - September. In 1976 an astonishing seven specimens were recorded in Norfolk.

In 2019, ten confirmed and one unconfirmed were recorded, the most ever on record in a single year.

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.
The species is now thought to be breeding once again in Suffolk, and possibly 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 note records will not be accepted without confirmation. Photo preferably showing the blue underwing required.

Retained Specimen / Photograph will be Required.

Recorded in 20 (29%) of 69 10k Squares.
First Recorded in 1834.
Last Recorded in 2019.
Additional Stats

< Beautiful Marbled  |  Red Underwing >

Determination
The Clifden Nonpareil in Norfolk 1976 - E.A. Ellis. Ent. Rec. 88. 1976.
List Species Records   [Show All Latest]
Latest 5 Records
Date#VC10k Area
23/10/2019128TL79 - Methwold/Foulden
07/10/2019127TG01 - Lyng/N.Tuddenham
04/10/2019127TG30 - Brundall/Cantley
30/09/2019127TM49 - Geldeston/Haddiscoe
30/09/2019127TG42 - Hickling/Horsey
Show Details | 1990 to 2018 | 2000 to 2018 |
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Copyright © Jim Wheeler 2019
   

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Forewing: 41-48mm.
Season: One generation Aug-Oct.
Foodplant:   Aspen, poplars
Nat Status: Immigrant
Verification Grade:  Adult: 3
 Immature Adult
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Underlying maps using Digital Map Data © Norfolk Online Lepidoptera Archive - NOLA™ 2019. © James Wheeler - Norfolk Moths 2007 - 2019. Data © NOLA™ 2019
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