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Useful pic. I looked these up and there is some talk of splitting them in to your upland ones and a separate lowland river one.
Jamie from Briantspuddle
Very interesting to hear this Jamie, thanks for sharing that with me. Will check out that link now.
The male Welshman's button has a distinctive maxillary palp which covers its face like a mask - this can be seen in the male in this imnage, on the left.
Thanks for this Inopinatus. I didnt know this was a feature to look for on the Welshmans Button.
Lat/Lng: 55.015, -6.023
OS grid ref: NW429763