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I found this in our garden, but it is an ex-bog, and still adjacent to boggy areas. It looks like a Prionocera species.
Mindful of what John Kramer said before with a similar species - there are some rare species that emerge in April and May. So this must be a possible.
If I see this again, do I need to capture?
Yes to Prionocera. This seems to be either P. turcica (quite common) or P. pubescens (not so common). Females are difficult to separate.
Agreed. There are 3 British species which look very similar, apart from the male genitalia. If you can photograph the terminal segment of a male, from above, that would be the most useful. You may find that you have more than one species. The resource partitioning that permits 3 species (or more in Scandinavia) to thrive on the same bog is not yet understood, so if you have more than one species, and look for larvae in different places and breed them through the results might be interesting.
Yes, I thought I'd found the wrong sex as well!
However, since I am located in a fairly promising place for finding such species, I feel some optimism in finding just the right thing.