Notodontidae : Notodontinae
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Lesser Swallow Prominent
Pheosia gnoma

(Fabricius, 1777) 2006 / 71.018
Photo © Colin Duke 2018,  Cromwell Bottom LNR, VC63

Immature stages

Similar Yorkshire Species
Swallow Prominent
Pheosia tremula
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Express Record Lesser Swallow Prominent

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Yorkshire Status: Common and widespread resident.

This is a birch-feeding species and it is common and widespread in good numbers across the county. It can be seen wherever birches grow. It is usually a brighter and more attractive species than Swallow Prominent and usually is easy to identify as the white wedge at the trailing corner of the wing is shorter and broader. Numbers in Yorkshire are healthy and stable, and trapping in birch woodland can result in quite large numbers at times, for example 77 at North Cliffe Wood on 6/8/2010. Like Swallow Prominent, it occurs in two broods, the second being largest.

Sutton & Beaumont, 1989: Recorded fairly commonly in all five vice-counties in areas where birch is well established such as heathlands in the Vale of York. It is also the most frequent Prominent in Wharfedale (WNS).

Recorded in 163 (82%) of 200 10k Squares.
First Recorded in 1883.
Last Recorded in 2023.
Additional Stats

< Swallow Prominent  |  Pale Prominent >
Forewing: 20-26mm
Flight: April - June and July - August
Foodplant:   Birch
Red List Status: Least Concern (LC)
GB Status: Common
Verification Grade:  Adult: 2
List Species Records   [Show All Latest]
Latest 5 Records
Date#VC10k Area
13/09/2023162SE98 - Wykeham
07/09/2023263SE60 - Hatfield
07/09/2023162SE98 - Wykeham
04/09/2023161TA17 - Bempton
03/09/2023162TA08 - Scarborough
  Immature   Adult   [Show Flight Weeks]
Show Details | 1990 to 2023 | 2000 to 2023 | Graph Key
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