73.331 BF2121 – Barred Chestnut – Diarsia dahlii – (Hübner, 1813)
Adult Macro: CAT 2 – Can be confused with other species – Good photographs may be required – 
– click for Adult Macro Verification Guidelines
– click for Adult Macro Verification Guidelines
– Rare / Uncommon / Scarce
– 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©
Distribution: (Last record: 6 September 2025 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).
General Comment: None *** Last updated on 4 March 2026 by TD ***
Forewing: 15-18mm
Last Recorded Year: 2025
Last Recorded By – Christian Heintzen
Last Recorded General Area – Glossop
Selected Images: ID guide kindly provided by Christian Heintzen © / Images Glossop & Long Clough – Christian Heintzen© / Glossop (July 2025) Christian Heintzen©
Image Gallery
No gallery images found for this moth.
Temporal Distribution Chart
Adults: (between 1917 - 2025)
(click legend below to show/hide datasets)
This chart summarises all available historical occurrence records collated by ISO week of the year. It reflects recorder effort and sampling distribution as well as true biological activity, and should be interpreted as an indicative pattern of seasonal occurrence rather than a statistically controlled abundance or phenology model.
Distribution Map for Diarsia dahlii
Found 84 records
↳ from 2026+
↳ 20 from 2020 - 2025
↳ 64 from Before 2020
↳ from 2026+
↳ 20 from 2020 - 2025
↳ 64 from Before 2020
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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.
NBN Atlas UK Distribution for – Diarsia dahlii
⚠️ Please wait for the map to load fully – do not click the link shown.
Note – the NBN Atlas datasets are listed in the map below and vary in their currency (uptodateness) – however,
the map does give a general indication of the moth's distribution across the UK.
Monthly Records By Year:
Diarsia dahlii
( data includes both Larvae and Adult Stages )
Monthly Counts By Year:
Diarsia dahlii
( data is based on 'Adult' stage records only )
First/Last Recorded Dates: Diarsia dahlii
Adult-only & Anything [Larvae, Pupae, Adult, Mines]
Shading shows moth presence between dates
Click the colour discs below to Select/De-select as Required
Recordings By Year: Diarsia dahlii
( All data includes both Larvae and Adult Stages )
Annual Growth Rate (AGR): Diarsia dahlii
AGR: 3.2% | Total % Change: 100%
Hectad (10kmx10km) Coverage: Diarsia dahlii
( data includes both Larvae and Adult Stages )
Flight Periods – Indicative –vs– Recorded Data
Diarsia dahlii
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 2020-2026.
Records Behind the Map and Charts - Diarsia dahlii – 84 records available
Listed by Year - descending - scroll across to see all table columns
| Site Name | Tetrad | Date | Count | Stage | Recorder | Source | RecordKey |
|---|---|---|---|---|---|---|---|
| Glossop, Chunal Plantation | SK09F | 06/09/2025 | 1 | adult | Heintzen, Christian | vc57_irecords_extract | iBRC48792405 |
| Glossop, Shittern Clough Woodland | SK09M | 26/08/2025 | 4 | adult | Heintzen, Christian | vc57_irecords_extract | iBRC48787347 |
| Cromford Moor | SK25X | 21/08/2025 | 2 | adult | Ashton, Clive | vc57_irecords_extract | iBRC44789726 |
| Glossop, Hague Street, Hay Meadow | SK09G | 25/07/2025 | 1 | adult | Heintzen, Christian | vc57_irecords_extract | iBRC43980592 |
| Glossop, Shawmoor Plantation | SK09G | 04/09/2024 | 2 | adult | Heintzen, Christian | vc57_irecords_extract | iBRC38678387 |
| Longdendale, Wildboar Clough Woodland | SK09U | 03/09/2024 | 1 | adult | Heintzen, Christian | vc57_irecords_extract | iBRC38678341 |
| Longdendale, Wildboar Clough Woodland | SK09U | 03/09/2024 | 1 | adult | Heintzen, Christian | vc57_irecords_extract | iBRC38678369 |
| Glossop, Gnat Hole Rough Fields | SK09L | 01/09/2024 | 1 | adult | Heintzen, Christian | vc57_irecords_extract | iBRC38657857 |
| Derbyshire Wild Life Trust Long Clough | SK09G | 31/08/2024 | 2 | adult | Heintzen, Christian | vc57_irecords_extract | iBRC38473512 |
| High Leas Farm, Riber | SK35D | 24/08/2024 | 1 | adult | Thorpe, Steve | vc57_irecords_extract | iBRC40045330 |
| Derbyshire Wild Life Trust Long Clough | SK09G | 23/08/2024 | 1 | adult | Heintzen, Christian | vc57_irecords_extract | iBRC38473372 |
| Glossop, Shawmoor Plantation | SK09F | 23/08/2023 | 11 | adult | Heintzen, Christian | vc57_irecords_extract | iBRC36337465 |
| Lower Cromford Garden | SK25Y | 23/08/2023 | 1 | adult | Ashton, Clive | vc57_irecords_extract | iBRC34568425 |
| Glossop, Gnat Hole Rough Fields | SK09L | 21/08/2023 | 1 | adult | Heintzen, Christian | vc57_irecords_extract | iBRC36337393 |
| Derbyshire Wild Life Trust Long Clough | SK09G | 11/08/2023 | 1 | adult | Heintzen, Christian | vc57_irecords_extract | iBRC36337191 |
| Glossop, Shawmoor Plantation | SK09F | 19/09/2022 | 2 | adult | Heintzen, Christian | vc57_irecords_extract | iBRC36335376 |
| Glossop, Shawmoor Plantation | SK09F | 18/09/2022 | 1 | adult | Heintzen, Christian | vc57_irecords_extract | iBRC36335370 |
| Lower Cromford Garden | SK25Y | 07/09/2022 | 1 | adult | Ashton, Clive | vc57_irecords_extract | iBRC34569348 |
| Glossop, Shawmoor Plantation | SK09F | 06/09/2022 | 1 | adult | Heintzen, Christian | vc57_irecords_extract | iBRC36335314 |
| Hathersage, Derbyshire, UK | SK28F | 29/07/2022 | 1 | adult | Miles, Claire | vc57_irecords_extract | iBRC28567988 |
| Not given | SK43W | 27/09/2019 | 2 | Adult | Bryce, Marion | vc57_irecords_extract | iBRC11857299 |
| Birch Vale | SK08I | 05/08/2019 | 1 | adult | Hewitt, Jane | vc57_irecords_extract | iBRC35073079 |
| Darley Dale (site not precise) | SK26R | 01/08/2018 | 1 | Adult | A.E.W. Morse | vc57_danes_bc_data | LC000334001WPU7H |
| Darley Dale (site not precise) | SK26R | 01/07/2017 | 1 | Adult | H.C. Hayward | vc57_danes_bc_data | LC000334001WPZ1P |
| Jim Mart Nature Reserve | SK36S | 23/08/2016 | 1 | Adult | Mahadevan, Nikki | vc57_irecords_extract | iBRC34908821 |
| School Close,Parkway Gardens,Darley Dale | SK26R | 11/09/2013 | 2 | Adult | A. Butler | vc57_danes_bc_data | LC000334001OLDTC |
| School Close,Parkway Gardens,Darley Dale | SK26R | 11/09/2013 | 2 | Adult | A. Butler | vc57_danes_bc_data | LC000334001WPO3L |
| Yew Tree Farm | SK36H | 06/07/2013 | 1 | adult | Sinnott, Tony | vc57_irecords_extract | iBRC38922768 |
| Welbeck Drive,Wingerworth | SK36T | 04/09/2012 | 1 | Adult | B.J.N. Hill | vc57_danes_bc_data | LC000334001OKA9M |
| Beeley Moor (Slagmill Plantation) | SK36E | 03/09/2012 | 1 | Adult | Dave Budworth;D.A. Clarke;P. Patrick | vc57_danes_bc_data | LC000334001OJW0W |
| Beeley Moor (Slagmill Plantation) | SK36E | 03/09/2012 | 1 | Adult | Dave Budworth;D.A. Clarke;P. Patrick | vc57_danes_bc_data | LC000334001WPC33 |
| The Mays,Malthouse Lane,Froggatt | SK27N | 02/09/2012 | 1 | Adult | Barnacle, Brian | vc57_danes_bc_data | LC000334001OKA8N |
| The Mays,Malthouse Lane,Froggatt | SK27N | 02/09/2012 | 1 | Adult | B. Barnacle;K. Barnacle | vc57_danes_bc_data | LC000334001WQHOR |
| The Mays,Malthouse Lane,Froggatt | SK27N | 11/08/2012 | 1 | Adult | Barnacle, Brian | vc57_danes_bc_data | LC000334001OJVMZ |
| The Mays,Malthouse Lane,Froggatt | SK27N | 11/08/2012 | 1 | Adult | B. Barnacle;K. Barnacle | vc57_danes_bc_data | LC000334001WQBOK |
| School Close,Parkway Gardens,Darley Dale | SK26R | 13/09/2011 | 1 | Adult | A. Butler | vc57_danes_bc_data | LC000334001OK80U |
| Cross Green Cottages,Flint Lane,South Darley | SK26Q | 03/09/2011 | 1 | Adult | R. Hawksworth | vc57_danes_bc_data | LC000334001OK7Y1 |
| School Close,Parkway Gardens,Darley Dale | SK26R | 26/08/2011 | 1 | Adult | A. Butler | vc57_danes_bc_data | LC000334001OL3YM |
| School Close,Parkway Gardens,Darley Dale | SK26R | 14/08/2011 | 1 | Adult | A. Butler | vc57_danes_bc_data | LC000334001OJT9I |
| Cross Green Cottages,Flint Lane,South Darley | SK26Q | 07/09/2009 | 1 | Adult | R. Hawksworth | vc57_danes_bc_data | LC000334001OK2V5 |
| Flash Lane,Beeley Moor | SK26X | 14/08/2009 | 1 | Adult | Roddis, Simon | vc57_danes_bc_data | LC000334001OJN0Y |
| Flash Lane,Beeley Moor | SK26X | 07/08/2009 | 7 | Adult | B.L. Statham | vc57_danes_bc_data | LC000334001OK2FM |
| Flash Lane,Beeley Moor | SK26X | 29/08/2008 | 23 | Adult | B.L. Statham | vc57_danes_bc_data | LC000334001OJL4B |
| Far Cross,Cavendish Park,Matlock | SK36A | 26/08/2008 | 1 | Adult | B.L. Statham | vc57_danes_bc_data | LC000334001OK0N7 |
| Cross Green Cottages,Flint Lane,South Darley | SK26Q | 24/08/2008 | 1 | Adult | R. Hawksworth | vc57_danes_bc_data | LC000334001OKLQ0 |
| Glossop (Shire Hill Quarry) | SK09M | 22/07/2008 | 1 | Adult | Colin Plant | vc57_danes_bc_data | LC000334001OKKUZ |
| Cross Green Cottages,Flint Lane,South Darley | SK26Q | 23/08/2007 | 1 | Adult | R. Hawksworth | vc57_danes_bc_data | LC000334001OJZ7F |
| The Hollies,Station Rd,Darley Dale | SK26R | 23/07/2007 | 1 | Adult | Roddis, Simon | vc57_danes_bc_data | LC000334001OJYWW |
| Cross Green Cottages,Flint Lane,South Darley | SK26Q | 21/09/2006 | 1 | Adult | R. Hawksworth | vc57_danes_bc_data | LC000334001OI92M |
| Cross Green Cottages,Flint Lane,South Darley | SK26Q | 22/08/2006 | 1 | Adult | R. Hawksworth | vc57_danes_bc_data | LC000334001OI8QI |
| Cross Green Cottages,Flint Lane,South Darley | SK26Q | 05/08/2006 | 1 | Adult | R. Hawksworth | vc57_danes_bc_data | LC000334001OI8K0 |
| Flash Lane,Beeley Moor | SK26X | 16/07/2006 | 3 | Adult | B.L. Statham | vc57_danes_bc_data | LC000334001OHTK7 |
| Cross Green Cottages,Flint Lane,South Darley | SK26Q | 04/09/2004 | 1 | Adult | R. Hawksworth | vc57_danes_bc_data | LC000334001OJ80J |
| Cross Green Cottages,Flint Lane,South Darley | SK26Q | 16/08/2003 | 1 | Adult | R. Hawksworth | vc57_danes_bc_data | LC000334001OJ4C9 |
| The Hollies,Station Rd,Darley Dale | SK26R | 07/08/2003 | 1 | Adult | Roddis, Simon | vc57_danes_bc_data | LC000334001OJ47D |
| School Close,Parkway Gardens,Darley Dale | SK26R | 14/09/1999 | 1 | Adult | A. Butler | vc57_danes_bc_data | LC000334001OHO7X |
| Stocksmoor Farm, Ashover Rd, Old Tupton | SK36S | 11/08/1997 | 5 | Adult | VC57 Derbyshire Recorder | vc57_danes_bc_data | LC000334001OI361 |
| Beeley Lodge, Chatsworth | SK26U | 04/08/1982 | 1 | Adult | VC57 Derbyshire Recorder | vc57_danes_bc_data | LC000334001OIAFA |
| Beeley Lodge, Chatsworth Park | SK26U | 04/08/1982 | 1 | Adult | A.C. Warne | vc57_danes_bc_data | LC000334001WPUTO |
| Slagmill Plantation,Beeley Moor | SK36E | 31/08/1979 | 1 | Adult | VC57 Derbyshire Recorder | vc57_danes_bc_data | LC000334001OHGNH |
| Hopton Wood Quarry (site not precise) | SK25M | 28/08/1970 | 1 | Adult | VC57 Derbyshire Recorder | vc57_danes_bc_data | LC000334001OHES2 |
| Beeley Moor, Beeley (site not precies) | SK26Z | 10/08/1968 | 1 | Adult | VC57 Derbyshire Recorder | vc57_danes_bc_data | LC000334001OHW2Z |
| Beeley Moor, Beeley (site not precise) | SK26Z | 10/08/1968 | 1 | Adult | B. Elliott | vc57_danes_bc_data | LC000334001WOP5G |
| Gladwin's Mark, Beeley Moor | SK36D | 01/09/1964 | 1 | Adult | VC57 Derbyshire Recorder | vc57_danes_bc_data | LC000334001OIH7M |
| Moorend, Beeley, Matlock | SK26T | 25/08/1959 | 2 | Adult | VC57 Derbyshire Recorder | vc57_danes_bc_data | LC000334001OHE4C |
| Moorend, Beeley | SK26T | 25/08/1959 | 2 | Adult | B.S. Fletcher | vc57_danes_bc_data | LC000334001WOOVU |
| Moorend, Beeley, Matlock | SK26T | 22/08/1959 | 1 | Adult | VC57 Derbyshire Recorder | vc57_danes_bc_data | LC000334001OIDMT |
| Moorend, Beeley | SK26T | 22/08/1959 | 1 | Adult | B.S. Fletcher | vc57_danes_bc_data | LC000334001WOOV8 |
| Moorend, Beeley, Matlock | SK26T | 20/08/1959 | 2 | Adult | VC57 Derbyshire Recorder | vc57_danes_bc_data | LC000334001OHVMQ |
| Moorend, Beeley | SK26T | 20/08/1959 | 2 | Adult | B.S. Fletcher | vc57_danes_bc_data | LC000334001WPIQF |
| Beeley, Matlock | SK26T | 06/08/1957 | 1 | Adult | VC57 Derbyshire Recorder | vc57_danes_bc_data | LC000334001OHEWW |
| Beeley | SK26T | 06/08/1957 | 1 | Adult | B.S. Fletcher | vc57_danes_bc_data | LC000334001WOSOL |
| Froggatt (site not precise) | SK27N | 28/08/1954 | 1 | Adult | VC57 Derbyshire Recorder | vc57_danes_bc_data | LC000334001OIDF0 |
| Froggatt (site not precise) | SK27N | 28/08/1954 | 1 | Adult | A.M. Emmet | vc57_danes_bc_data | LC000334001WPQ7X |
| Littleover, Derby (site not precise) | SK33G | 01/01/1951 | 1 | Adult | [VC57 Recorder] | vc57_danes_bc_data | LC000334001TAGFO |
| Littleover, Derby (site not precise) | SK33G | 01/01/1951 | 1 | Adult | A.H. Turner | vc57_danes_bc_data | LC000334001WOSKW |
| Froggatt (site not precise) | SK27N | 28/08/1948 | 1 | Adult | VC57 Derbyshire Recorder | vc57_danes_bc_data | LC000334001OHDHP |
| Froggatt (site not precise) | SK27N | 28/08/1948 | 1 | Adult | A.M. Emmet | vc57_danes_bc_data | LC000334001WOSKJ |
| Darley Dale (site not precise) | SK26R | 01/08/1918 | 1 | Adult | VC57 Derbyshire Recorder | vc57_danes_bc_data | LC000334001OID90 |
| Darley Dale (site not precise) | SK26R | 01/07/1917 | 1 | Adult | VC57 Derbyshire Recorder | vc57_danes_bc_data | LC000334001OID7Y |
| Bakewell (site not precise) | SK26J | 01/01/1894 | 1 | Adult | [VC57 Recorder] | vc57_danes_bc_data | LC000334001TAGB1 |
| Bakewell (site not precise) | SK26J | 01/01/1894 | 1 | Adult | R.H. Fuller | vc57_danes_bc_data | LC000334001WPQ3Y |
| Derbyshire (site not precise) | SK33L | 01/01/1870 | 1 | Adult | E. Newman | vc57_danes_bc_data | LC000334001WPZ7W |
| Derbyshire (site not precise) | SK33L | 01/01/1800 | 1 | Adult | VC57 Derbyshire Recorder | vc57_danes_bc_data | LC000334001OJYHT |