Yorkshire Status: Local resident.

Marbled Brown has never been a common moth in Yorkshire. Populations in the northern half of the UK tend to be rather fragmented. It is a moth of established woodland with old oak trees and our records tend to come from the centre of the county, extending well up into VC62. It is extremely uncommon in VC63. We have had more records in recent years though this may partially be due to increased recorder effort. In good habitat in late May and early June it can sometimes be found in good numbers, for example 22 at Bulmer Hagg in VC62 on 17/5/2023. An example of the rare nigrescens form was found at Askham Bog in 2021. This is said to be more common in East Anglia. Do not confuse this species with Lunar Marbled Brown which flies earlier and is much more widespread in Yorkshire.

Sutton & Beaumont, 1989: This species seems to be at the limit of its north-eastern range in Yorkshire and currently seems to be in decline. There are only two recent sites, both in VC61 although there should be no shortage of suitable oak woods elsewhere in the County.

Recorded in 29 (15%) of 200 10k Squares. First Recorded in 1883. Last Recorded in 2023. Additional Stats

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