Devon to Kent, Wales and north to mid-west Yorkshire and Morecombe Bay.
A widely distributed central and southern European species, also found eastwards through Asia to Japan (Lomholdt 1975-76). The species may be Holarctic, as Vincent (in Bohart & Menke 1976), synonymised the nearactic P. ithacae Krombein, 1938, with P. insignis. Thus enlarged, P. insignis is also found in Canada (Alberta) and the north-east United States to Virginia. (It is also possible that the taxon 'P.ithacae' includes both P. insignis and P. monilicornis).