The story begins with finding a small Water Carpet Lampropteryx suffumata type on the 17/5/2019 with a wing length of 13mm at Ballinclare, Glenealy, Co. Wicklow. 13mm was smack bang in the middle of Devon Carpet Lampropteryx otregiata size and apparently outside the normal Water Carpet range of 14-17mm. Although the jury was out as to its identity from the external appearance, Ken Bond dissected it and found it to be just a female Water Carpet.
On the 28/5/2020 I trapped with a 50w MV at a spot 170m away from the above spot at the edge of a small natural Aspen Populus tremula copse (Grid Ref. T258893). I caught another small Water Carpet type with a wing length of 13mm. It was missing the apex of one of its wings but it still immediately stood out as not normal for Water Carpet. I posted a photo on the MothsIreland Facebook page and there followed much discussion as to its identity but as there was little actual experience of Devon Carpet in Ireland, I also posted on UK Moths where it was thought to be this species. As my first experience had thought me, I decided to again send it to Ken Bond for dissection. Eventually the news came through that this was indeed a Devon Carpet, Ireland’s first.
Unbeknownst to me, Dave Allen had previously predicted this as a potential new species to find in Ireland as they were spreading west in the UK. On the 30/7/2020, I trapped another fresh one at the same spot. This was probably a 2nd generation, something that does not occur in Water Carpets. It was also small and showed all the features of a Devon Carpet so it was released after some good photos were obtained. The habitat beside the trapping area is very wet under the aspen wood and probably contains the food plant of Devon Carpet, Marsh Bedstraw Galium palustre. As it is a tiny plant and I am not familiar with it, I have not actually seen it here. With the two specimens found at the same site of first and second generations in one season, I would conclude that they are probably breeding here.
In GB, Devon Carpet has historically been restricted to the south-west but has been spreading rapidly north up the west coast in recent years, reaching the Midlands in 2009 and Scotland in 2013.
I would like to thank Ken Bond for confirming the identification.