North Wales Lepidoptera Database

This online database contains all available* butterfly and moth records from the six vice-counties of North Wales: Montgomeryshire (VC47), Merionethshire (VC48), Caernarvonshire (VC49), Denbighshire (VC50), Flintshire (VC51) and Anglesey (VC52). (To see a map of the vice-counties click on the menu option above). The table below summarises the current number of records from each vice-county along with the number of species recorded.  Note that these numbers are recalculated whenever this page is loaded - hence the slight delay in loading the page.

Only records where the moth or butterfly was identified to the species level are included here, i.e. records assigned to aggregate categories are ignored. (There are currently 14,021  such aggregate records).

North Wales totals VC47 VC48 VC49 VC50 VC51 VC52
No. of micro-moths recorded 980 649 719 792 727 585 605
No. of macro-moths recorded   621 527 561 529 546 456 501
No. of butterflies recorded 49 40 45 46 37 38 37
Total no. of spp recorded 1650 1216 1325 1367 1310 1079 1143
Total no. of records 926,303 245,280 151,522 260,713 58,538 56,972 153,261

Database accessed: 1/17/2019 9:05:05 PM

A pivot table showing the number of records for each taxon by vice-county can be generated here: .

The information displayed in this website is generated dynamically whenever a request is made. Thus there are no distribution maps stored on the server so when a map is requested a complex series of actions occur to prepare the map and then send it to your browser. The advantage of this approach is flexibilty - nothing has to be prepared in advance. The disadvantage is that the whole website runs more slowly than many others which are much simpler and merely consist of a series of linked pre-prepared pages. Speed is a particular issue when dealing with very common species for which there are a large number of records. E.g. the map for Meadow Brown will take longer to generate than for some rarity with only one or two records.

Note that, in common with many other websites, this one requires your browser to be 'javascript enabled' and to 'accept cookies'. The latter functionality is needed simply to store temporary variables used in the behind-the-scenes processing. These are deleted at the end of your session.

*  Not all records from recent years have yet been collated. Also, not all of the county datasets have been made available for use on this website. The records that are included are shown in the table below.

VC47 VC48 VC49 VC50 VC51 VC52
Butterflies up to end 2016 up to date up to date partial data only partial data only up to date
Moths up to end 2017 up to date up to end 2016. macros up to end 2016
micros up to end 2017
macros up to end 2016
micros up to end 2017
up to date but some records probably lost.


Many thanks to everyone who has helped make this website possible both by supplying datasets and by commenting on layout and functionality. I am particularly grateful to those of my fellow Vice-County Recorders who have been generous in supplying their county datasets and providing annual updates, to BIS (Biological Information Services) for allowing the use of their moth and butterfly records from Montgomeryshire and to Cofnod for close co-operation over the Lepidoptera records from Merionethshire.

The micro-moth UK status categories are taken from: A Review of the Status of Microlepidoptera in Britain, Butterfly Conservation Report No. S12-02, Tony Davis, January 2012.

Macro-moth UK status categories are from an earlier (2004) table also prepared by Tony Davis.

The English names used for micro-moths are taken from: A Label and Checklist of the British Micro-lepidoptera with Vernacular Names (second edition), Jim Porter, October 2002.

The Welsh names for macro-moths are from a spreadsheet prepared by Duncan Brown.