Reference:
RICHARDS, Owain Westmacott. 1983, The British Bethylidae (sl)(Hymenoptera). Transactions of the Royal entomological Society of London, 89.8: 185-344.
URL:
https://resjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2311.1939.tb00740.x
