Crossocerus aphidium misident.; Crabro cloevorax (NIELSON,1901); Crabro clypearis (SCHENCK,1857); Crabro geniculatus (SHUCKARD,1837)
A small black solitary wasp with a yellow clypeus in both sexes. Identification keys are given in Yeo & Corbet (1995), Lomholdt (1984) and Richards (1980).
There are scattered records from across much of Britain, northwards to central Scotland. Overseas, recorded from northern and central Europe, Central Asia and Japan (Bitsch & Leclerq 1993).