Geometridae : Larentiinae
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Photo © John Maxen,  Sunbury-On-Thames, Middlesex (18/06/24)

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Similar Herts & Middlesex Species: None
Grass Rivulet
Perizoma albulata

([Denis & Schiffermüller], 1775) 1807 / 70.137

General comments:
Widespread resident - extending its range southwards and eastwards.

Nationally, we are informed, there has been a 96 per cent decline in population since 1970; in Hertfordshire we could not provide numerical data, but writing in the 2008 "Herts Moth Book" I said that it appears to have been lost from 83 per cent of formerly occupied sites. Happily, this situation has reversed with the moth staging a remarkable comeback starting in the north-west of Hertfordshire from around 2005 onwards - spreading south and east. The colonisation of Middlesex started in around 2014, with many records that year. At the start of 2023 its is a widespread and not uncommonly encountered resident in most areas of the two counties.

Recorded in 26 (63%) of 41 10k Squares.
First Recorded in 1887.
Last Recorded in 2024.
Additional Stats

< Barred Rivulet | Sandy Carpet >

List Species Records   [Show All Latest]
Latest 5 Records
Date#VC10k Area
18/06/2024121TQ16 - Sunbury / Hampton Court
12/06/2023120TL23 - Letchworth / Baldock
11/06/2023220TL23 - Letchworth / Baldock
09/06/2023221TQ18 - Harrow / Wembley / Ealing
08/06/2023220TL12 - Hitchin (S) / Whitwell
Show Details | 1990 to 2023 | 2000 to 2023 | Graph Key
Express Record Grass Rivulet
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Copyright © Lepidoptera UK 2024

VC20 VC21 VC21 VC20
Click Map for Details
Forewing: 10-12mm.
Flight: One generation May-July.
Foodplant:   Yellow-rattle
Red List: Least Concern (LC)
GB Status: Common
BAP Status: Declining (Research only)
Former Status: Local
Verification Grade:  Adult: 1
 Immature Adult   [Show Flight Weeks]
© 2024 NOLA®; Database using MapMate® Digital Maps © Bartholomew 2010. Design © Jim Wheeler 2024
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