---

I think it will be difficult/impossible to confirm this one :|, Alan Stubbs' key focuses on the males, and although he illustrates the female cerci the differences between the species are (to my eyes) very subtle (including a short-ovipositor form of T. saltator).

As you probably know there are at least 10 species of Trichocera in Britain, don't know how many of them could be present on Shetland.

Martin