Geometridae : Sterrhinae
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Treble Brown Spot
Idaea trigeminata

(Haworth, 1809) 1711 / 70.012
Photo © Andy Nunn,  Lowestoft Suffolk

Similar Yorkshire Species
Single-dotted Wave
Idaea dimidiata
Small Fan-footed Wave
Idaea biselata
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Express Record Treble Brown Spot

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Yorkshire Status: Scarce wanderer, probably in the process of becoming resident.

This southern species has been doing well in recent years and is slowly moving north so it was no great surprise when one was found at Spurn on 17/6/2022. A second moth was found the following year a little further down the peninsula. It is likely that this is the precursor to colonisation so it will be interesting to follow the progress. Take care not to confuse it with the much commoner and widespread Single-dotted Wave.

Recorded in 2 (1%) of 200 10k Squares.
First Recorded in 2022.
Last Recorded in 2023.
Additional Stats

< Single-dotted Wave  |  Small Fan-footed Wave >
Forewing: 10-11mm
Flight: Two Generations. May - July, July - September
Foodplant:   Various plants, including Knotgrass and Ivy
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
26/06/2023161TA41 - Kilnsea / Spurn Head
17/06/2022161TA31 - Skeffling / Easington
  Immature   Adult   [Show Flight Weeks]
Show Details | 1990 to 2023 | 2000 to 2023 | Graph Key
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