Yorkshire Status: Fairly common resident.

Treble-lines has always had a rather patchy distribution in the county. In 1907, Porritt wrote "common in many districts east and west, yet in some places, scarcely found at all". It remained rather local and infrequent in many areas until 2000 then started to become more common, and since 2019 we have had considerably more records. This is mirrored nationally, the Atlas saying "it has shown major long-term increases in distribution and abundance". Our records are almost at the northern edge of the national distribution. It is now much commoner in VC63 than it appears to have been in Sutton and Beaumont's 1989 comments, though it is still absent from some parts of Yorkshire, particularly in the west and on the higher ground. In some parts of the county, large numbers are trapped, the maximum being 157 on 31/5/2019 at Austerfield.

Sutton & Beaumont, 1989: Very local but often quite frequent where it does occur. Apparently associated with limestone, chalk and sandy soils. There are no confirmed recent records from VC63.

Recorded in 92 (46%) of 200 10k Squares. First Recorded in 1883. Last Recorded in 2023. Additional Stats

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