Flame Shoulder       Purple Clay
73.331 BF2121  –  Noctuidae –  Noctuinae – Diarsia dahlii – Barred Chestnut Adult Macro:  CAT 2 – Can be confused with other species – Can be confused with other species       PDF Icon – click for Adult Macro Verification Guidelines
Green –  Rare / Uncommon / Scarce   
Taxonomy:   Macro  >> .  . >>  Noctuidae  >> Noctuinae
ID Difficulty:  amber  – care required in the identification process, as confusion with similar species is likely – quality photographs required.
Confusion Species:  Purple clay, Small Square-spot, Ingrailed Clay
ID pointers: See ID Guide below provided by Christian Heintzen©
Further ID Pointers: 🔗 Diarsia ID Reference
Distribution:  (Last record: 4 September 2024 at Glossop )  –  Widely distributed across the upland moorland areas of North Derbyshire, but not in large numbers. The distribution seems to be concentrated around the central part of the county, with some records from further north (Buxton). 
Flight Period: July /  August /  September /  –  July – September Moth Activity: Nocturnal  Photographed: Yes –  Photographed By: Christian Heintzen  © All Rights Reserved
*** Last updated on 6 May 2025 by RP ***
Wingspan: 32-42mm
Forewing: 15-18mm Food Plant: Birch (Betula) and Bilberry (Vaccinium myrtillus).
Last Recorded Year: September 2024
Last Recorded By – Christian Heintzen
Last Recorded General Area – Glossop
IMAGES BELOW:  ID guide kindly provided by Christian Heintzen ©  / Images  Glossop & Long Clough – Christian Heintzen©

Barred Chestnut - Christian Heintzen
Barred Chestnut – Christian Heintzen
Barred Chestnut - 23rd August 2024 - Long Clough - Christian Heintzen
Barred Chestnut – 23rd August 2024 – Long Clough – Christian Heintzen
Barred Chestnut - 1st September 2024 - Gnat Hole, Glossop -Christian Heintzen
Barred Chestnut – 1st September 2024 – Gnat Hole, Glossop -Christian Heintzen
Barred Chestnut - Christian Heintzen
Barred Chestnut - 23rd August 2024 - Long Clough - Christian Heintzen
Barred Chestnut - 1st September 2024 - Gnat Hole, Glossop -Christian Heintzen

no images were found

Distribution Map for Diarsia dahlii

derbyshiremoths.org © makes no guarantee of accuracy of data used in these maps and charts – they are presented to you with best endeavours and the data behind them updated periodically as time permits. Historic records are being discovered all the time. These will be assessed, so once they are all verified, they will be incorporated onto the map and charts.

Found 80 records
    ↳ 0 from After 2025
    ↳ 16 from 2020 - 2024
    ↳ 64 from Before 2020

If the Map Layers function fails, just refresh the page and it should be OK after. Use the +- zoom on the top left, or on a tablet, use two fingers to zoom. Remember, the last layer you ticked is the one which displays the popup information - they sit on top of each other - de-select then re-select, to see the popup values.

******* Choose ONLY one at a time, of either Monad, Tetrad or Hectad Distribution - each has it's own set of data. Also, the distribution maps cover ALL recorded data. *******

Bedrock Geology ** indirectly affects moth distribution by influencing the type of habitat and food plants available in an area. In turn, this may affect the types of moths that can thrive, or where they can most likely be found.


Monthly Records By Year: Diarsia dahlii

Monthly Counts By Year: Diarsia dahlii

Recordings By Year: Diarsia dahlii

Annual Growth Rate (AGR): Diarsia dahlii
AGR: 0.94%   |   Total % Change: 25.2%
Years Analysed: 2000 – 2024

Hectad (10kmx10km) Coverage: Diarsia dahlii

Flight Periods – Indicative –vs– Recorded Data
Diarsia dahlii

Flight Period chart – the grey hatched area above, which can cross one or more months, pictorially represents the best guess we have for this moth's flight periods [month/s]. The coloured lines represent the actual months seen in flight, from site observation records received between 2020-2025.

Records Behind the Map and Charts - Diarsia dahlii – 80 records available

Listed by Year - descending

TaxonSite NameTetradYearDateCountStage
Diarsia dahliiLongdendale, Wildboar Clough WoodlandSK09U202403/09/20241adult
Diarsia dahliiLongdendale, Wildboar Clough WoodlandSK09U202403/09/20241adult
Diarsia dahliiGlossop, Shawmoor PlantationSK09G202404/09/20242adult
Diarsia dahliiGlossop, Gnat Hole Rough FieldsSK09L202401/09/20241adult
Diarsia dahliiHigh Leas Farm, RiberSK35D202424/08/20241adult
Diarsia dahliiDerbyshire Wild Life Trust Long CloughSK09G202423/08/20241adult
Diarsia dahliiDerbyshire Wild Life Trust Long CloughSK09G202431/08/20242adult
Diarsia dahliiGlossop, Shawmoor PlantationSK09F202323/08/202311adult
Diarsia dahliiDerbyshire Wild Life Trust Long CloughSK09G202311/08/20231adult
Diarsia dahliiLower Cromford GardenSK25Y202323/08/20231adult
Diarsia dahliiGlossop, Gnat Hole Rough FieldsSK09L202321/08/20231adult
Diarsia dahliiLower Cromford GardenSK25Y202207/09/20221adult
Diarsia dahliiGlossop, Shawmoor PlantationSK09F202218/09/20221adult
Diarsia dahliiGlossop, Shawmoor PlantationSK09F202219/09/20222adult
Diarsia dahliiGlossop, Shawmoor PlantationSK09F202206/09/20221adult
Diarsia dahliiHathersage, Derbyshire, UKSK28F202229/07/20221adult
Diarsia dahliiSK43W201927/09/20192Adult
Diarsia dahliiBirch ValeSK08I201905/08/20191adult
Diarsia dahliiDarley Dale (site not precise)SK26R201801/08/2018 - 31/08/20181Adult
Diarsia dahliiDarley Dale (site not precise)SK26R201701/07/2017 - 31/07/20171Adult
Diarsia dahliiJim Mart Nature ReserveSK36S201623/08/20161Adult
Diarsia dahliiSchool Close,Parkway Gardens,Darley DaleSK26R201311/09/20132Adult
Diarsia dahliiSchool Close,Parkway Gardens,Darley DaleSK26R201311/09/20132Adult
Diarsia dahliiYew Tree FarmSK36H201306/07/20131adult
Diarsia dahliiThe Mays,Malthouse Lane,FroggattSK27N201202/09/20121Adult
Diarsia dahliiThe Mays,Malthouse Lane,FroggattSK27N201202/09/20121Adult
Diarsia dahliiWelbeck Drive,WingerworthSK36T201204/09/20121Adult
Diarsia dahliiBeeley Moor (Slagmill Plantation)SK36E201203/09/20121Adult
Diarsia dahliiBeeley Moor (Slagmill Plantation)SK36E201203/09/20121Adult
Diarsia dahliiThe Mays,Malthouse Lane,FroggattSK27N201211/08/20121Adult
Diarsia dahliiThe Mays,Malthouse Lane,FroggattSK27N201211/08/20121Adult
Diarsia dahliiCross Green Cottages,Flint Lane,South DarleySK26Q201103/09/20111Adult
Diarsia dahliiSchool Close,Parkway Gardens,Darley DaleSK26R201113/09/20111Adult
Diarsia dahliiSchool Close,Parkway Gardens,Darley DaleSK26R201126/08/20111Adult
Diarsia dahliiSchool Close,Parkway Gardens,Darley DaleSK26R201114/08/20111Adult
Diarsia dahliiCross Green Cottages,Flint Lane,South DarleySK26Q200907/09/20091Adult
Diarsia dahliiFlash Lane,Beeley MoorSK26X200914/08/20091Adult
Diarsia dahliiFlash Lane,Beeley MoorSK26X200907/08/20097Adult
Diarsia dahliiCross Green Cottages,Flint Lane,South DarleySK26Q200824/08/20081Adult
Diarsia dahliiFlash Lane,Beeley MoorSK26X200829/08/200823Adult
Diarsia dahliiFar Cross,Cavendish Park,MatlockSK36A200826/08/20081Adult
Diarsia dahliiGlossop (Shire Hill Quarry)SK09M200822/07/20081Adult
Diarsia dahliiCross Green Cottages,Flint Lane,South DarleySK26Q200723/08/20071Adult
Diarsia dahliiThe Hollies,Station Rd,Darley DaleSK26R200723/07/20071Adult
Diarsia dahliiCross Green Cottages,Flint Lane,South DarleySK26Q200621/09/20061Adult
Diarsia dahliiCross Green Cottages,Flint Lane,South DarleySK26Q200622/08/20061Adult
Diarsia dahliiCross Green Cottages,Flint Lane,South DarleySK26Q200605/08/20061Adult
Diarsia dahliiFlash Lane,Beeley MoorSK26X200616/07/20063Adult
Diarsia dahliiCross Green Cottages,Flint Lane,South DarleySK26Q200404/09/20041Adult
Diarsia dahliiThe Hollies,Station Rd,Darley DaleSK26R200307/08/20031Adult
Diarsia dahliiCross Green Cottages,Flint Lane,South DarleySK26Q200316/08/20031Adult
Diarsia dahliiSchool Close,Parkway Gardens,Darley DaleSK26R199914/09/19991Adult
Diarsia dahliiStocksmoor Farm, Ashover Rd, Old TuptonSK36S199711/08/1997 - 27/08/19975Adult
Diarsia dahliiBeeley Lodge, Chatsworth ParkSK26U198204/08/19821Adult
Diarsia dahliiBeeley Lodge, ChatsworthSK26U198204/08/19821Adult
Diarsia dahliiSlagmill Plantation,Beeley MoorSK36E197931/08/19791Adult
Diarsia dahliiHopton Wood Quarry (site not precise)SK25M197028/08/19701Adult
Diarsia dahliiBeeley Moor, Beeley (site not precies)SK26Z196810/08/19681Adult
Diarsia dahliiBeeley Moor, Beeley (site not precise)SK26Z196810/08/19681Adult
Diarsia dahliiGladwin's Mark, Beeley MoorSK36D196401/09/19641Adult
Diarsia dahliiMoorend, BeeleySK26T195922/08/19591Adult
Diarsia dahliiMoorend, Beeley, MatlockSK26T195920/08/19592Adult
Diarsia dahliiMoorend, BeeleySK26T195925/08/19592Adult
Diarsia dahliiMoorend, Beeley, MatlockSK26T195922/08/19591Adult
Diarsia dahliiMoorend, Beeley, MatlockSK26T195925/08/19592Adult
Diarsia dahliiMoorend, BeeleySK26T195920/08/19592Adult
Diarsia dahliiBeeley, MatlockSK26T195706/08/19571Adult
Diarsia dahliiBeeleySK26T195706/08/19571Adult
Diarsia dahliiFroggatt (site not precise)SK27N195428/08/19541Adult
Diarsia dahliiFroggatt (site not precise)SK27N195428/08/19541Adult
Diarsia dahliiLittleover, Derby (site not precise)SK33G195101/01/1951 - 31/12/19511Adult
Diarsia dahliiLittleover, Derby (site not precise)SK33G195101/01/1951 - 31/12/19511Adult
Diarsia dahliiFroggatt (site not precise)SK27N194828/08/19481Adult
Diarsia dahliiFroggatt (site not precise)SK27N194828/08/19481Adult
Diarsia dahliiDarley Dale (site not precise)SK26R191801/08/19181Adult
Diarsia dahliiDarley Dale (site not precise)SK26R191701/07/19171Adult
Diarsia dahliiBakewell (site not precise)SK26J189401/01/1894 - 31/12/18941Adult
Diarsia dahliiBakewell (site not precise)SK26J189401/01/1894 - 31/12/18941Adult
Diarsia dahliiDerbyshire (site not precise)SK33L187001/01/1870 - 31/12/18701Adult
Diarsia dahliiDerbyshire (site not precise)SK33L180001/01/1800 - 31/12/18701Adult

Flame Shoulder       Purple Clay

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