– click for Adult Macro Verification Guidelines
– Rare / Uncommon / Scarce 
– Migrant
– easy to identify, generally distinctive and unlikely to be confused with other species.ID pointers: A large and powerful looking moth. The long narrow wings help to distinguish this from other large noctuids. The immigrants that arrive from Scandinavia are grey (as is this specimen). The local British population are usually dark blackish with a variable amount of lighter grey markings.
Distribution: (Last record: 2 September 2022 at Buxton ) – Either a rare resident or a rare immigrant in Derbyshire. A scattering of records with 14 between 1968 – 1986, the majority of which were from the Matlock area indicating a possible low density colony but never been proven. During August 2007 there was a large influx into Britain and several. 5, were trapped in the county all from the Darley Dale area. Latest record is of one in a Buxton garden moth trap on 3rd September 2022.
*** Last updated on 2 October 2025 by RP ***
Forewing: 24-27mm
Last Recorded Year: September 2022
Last Recorded By – Steve Orridge
Last Recorded General Area – Buxton
Selected Images: Darley Dale, Derbyshire – Simon Roddis© and Buxton, Derbyshire – Steve Orridge©
Image Gallery
Distribution Map for Eurois occulta
Found 33 records
↳ 0 from After 2025
↳ 1 from 2020 - 2024
↳ 32 from Before 2020
↳ 0 from After 2025
↳ 1 from 2020 - 2024
↳ 32 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.
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 – Eurois occulta
⚠️ 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:
Eurois occulta
( data includes both Larvae and Adult Stages )
Monthly Counts By Year: Eurois occulta
( data is based on 'Adult' stage records only. )
First/Last Recorded Dates: Eurois occulta
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: Eurois occulta
( All data includes both Larvae and Adult Stages )
Annual Growth Rate (AGR): Eurois occulta
AGR: 0% | Total % Change: 0%
CUSUM Analysis: Eurois occulta
About this chart: CUSUM (Cumulative Sum) charts track long-term trends in moth populations [ filtered by 'Adult' and 'Mine' life stages ] by showing whether each year’s counts are above or below the historical average. Even small shifts build up over time, making trends of growth, stability, or decline easier to see. CUSUM highlights trend-consistency — asking: “Across the years, have moth counts mostly stayed above or below average?”
The data sample has 20 gap year/s here (zero records) between 2000 and 2025. The moth may have been present in those gap years, but no data was available. Too many year-gaps may exaggerate or skew the chart.
Counts for the current year (2025) are pro-rated based on data available up to month 8 (August) to provide a full-year equivalent.
ⓘ
Purple line rises = years better than average; falls = years worse than average.
Peak (best year)
Trough (worst year)
Growth periods
Decline periods
Population peaked around 2013, reaching above average levels. The lowest population point occurred near 2012, showing a significant decline.
What the Y-axis "Cumulative Deviation" means: Cumulative Deviation shows the running total of how each year’s moth population count differs from the long-term average. i
Hectad (10kmx10km) Coverage: Eurois occulta
( data includes both Larvae and Adult Stages )
Flight Periods – Indicative –vs– Recorded Data
Eurois occulta
Eurois occulta
( data includes Adult Stage only )
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 - Eurois occulta – 33 records available
Listed by Year - descending - scroll across to see all table columns
| Site Name | Tetrad | Date | Count | Stage | Source |
|---|---|---|---|---|---|
| Ladycroft Ave, Buxton | SK07S | 02/09/2022 | 1 | adult | vc57_irecords_extract |
| Birch Vale | SK08I | 10/08/2017 | 1 | adult | vc57_irecords_extract |
| Lang Rd, Alvaston, Derby | SK33R | 05/07/2013 | 2 | Adult | vc57_danes_bc_data |
| Lang Rd, Alvaston, Derby | SK33R | 05/07/2013 | 2 | Adult | vc57_danes_bc_data |
| Lang Rd, Alvaston, Derby | SK33R | 30/06/2013 | 1 | Adult | vc57_danes_bc_data |
| Lang Rd, Alvaston, Derby | SK33R | 25/06/2013 | 1 | Adult | vc57_danes_bc_data |
| Lang Rd, Alvaston, Derby | SK33R | 17/06/2013 | 1 | Adult | vc57_danes_bc_data |
| Lang Rd, Alvaston, Derby | SK33R | 17/06/2013 | 1 | Adult | vc57_danes_bc_data |
| Lang Rd, Alvaston, Derby | SK33R | 30/06/2013 | 1 | Adult | vc57_danes_bc_data |
| Lang Rd, Alvaston, Derby | SK33R | 25/06/2013 | 1 | Adult | vc57_danes_bc_data |
| Repton (in garden) | SK32D | 25/07/2012 | 1 | Adult | vc57_danes_bc_data |
| Rose Av,Clowne | SK57D | 15/08/2010 | 1 | Adult | vc57_danes_bc_data |
| Rose Av,Clowne | SK57D | 25/08/2010 | 1 | Adult | vc57_danes_bc_data |
| The Hollies,Station Rd,Darley Dale | SK26R | 04/09/2007 | 1 | Adult | vc57_danes_bc_data |
| The Hollies,Station Rd,Darley Dale | SK26R | 24/08/2007 | 1 | Adult | vc57_danes_bc_data |
| School Close,Parkway Gardens,Darley Dale | SK26R | 26/08/2007 | 1 | Adult | vc57_danes_bc_data |
| The Hollies,Station Rd,Darley Dale | SK26R | 23/08/2007 | 1 | Adult | vc57_danes_bc_data |
| School Close,Parkway Gardens,Darley Dale | SK26R | 24/08/2007 | 1 | Adult | vc57_danes_bc_data |
| Far Cross,Cavendish Park,Matlock | SK36A | 08/08/1997 | 1 | Adult | vc57_danes_bc_data |
| Deerlands Rd, Ashgate, Chesterfield | SK37K | 01/09/1996 | 1 | Adult | vc57_danes_bc_data |
| Deerlands Rd, Ashgate, Chesterfield | SK37K | 01/09/1996 | 1 | Adult | vc57_danes_bc_data |
| Newbold Ave, Chesterfield | SK37R | 24/08/1957 | 1 | Adult | vc57_danes_bc_data |
| Langley Mill, Heanor (site not precise) | SK44N | 07/08/1939 | 1 | Adult | vc57_danes_bc_data |
| Langley Mill, Heanor (site not precise) | SK44N | 07/08/1939 | 1 | Adult | vc57_danes_bc_data |
| Repton (in garden) | SK32D | 25/07/1912 | 1 | Adult | vc57_danes_bc_data |
| Little Eaton, Derby (site not precise) | SK34Q | 01/01/1895 | 1 | Adult | vc57_danes_bc_data |
| Little Eaton, Derby (site not precise) | SK34Q | 01/01/1895 | 1 | Adult | vc57_danes_bc_data |
| Drakelow, Burton on Trent (site not precise) | SK21J | 01/01/1885 | 1 | Adult | vc57_danes_bc_data |
| Drakelow, Burton on Trent (site not precise) | SK21J | 01/01/1885 | 1 | Adult | vc57_danes_bc_data |
| Barrow on Trent, Derby (site not precise) | SK32P | 01/01/1885 | 1 | Adult | vc57_danes_bc_data |
| Bretby area, Swadlincote (site not precise) | SK22W | 01/01/1881 | 3 | Adult | vc57_danes_bc_data |
| Bretby area, Swadlincote (site not precise) | SK22W | 01/01/1881 | 3 | Adult | vc57_danes_bc_data |
| Barrow on Trent, Derby (site not precise) | SK32P | 01/01/1800 | 1 | Adult | vc57_danes_bc_data |