A small, all black, scantily-haired bee with dirty-yellow scopae on the hind legs on the female. The male has distinctive pegs underneath the hind femora. In dull weather males are often found curled up in the flowers of yellow Asteraceae, especially hawkweeds. They may stay shut inside the closed flower overnight.
Known from southern England and Wales. It is also present in the Channel Islands. This species is much less widespread in occurrence than P. banksianus. Overseas, this species occurs in Europe, from Finland south to Spain, and east to Turkey and the Urals.