Identification keys and general biology are given in Olberg (1959), Spradbery (1973), Richards (1980), Falk (1991), Yeo & Corbet (1995) and Archer (2000). This species is known as the Heath Potter Wasp.

The only representative of its genus in Britain, this species has always been regarded as a rarity, from its discovery in Britain in 1868 to the present day (Archer 2000). It is targeted for action under English Nature's Species Recovery Programme (Edwards & Roberts 1995; Roberts 1996, 1997, 1998, 1999; Roberts & Else 1997).

Identification keys and general biology are given in Bristowe (1948), Danks (1971), Spradbery (1973), Richards (1980), Yeo & Corbet (1995) and Archer (2000).

Identification keys and general biology are given in Krombein (1967), Spradbery (1973), Richards (1980), Yeo & Corbet (1995) and Archer (2000).

Previously known as Ancistrocerus callosus (Thomson, 1870). Identification keys and general biology are given in Nielsen (1932), Spradbery (1973), Richards (1980), Yeo & Corbet (1995) and Archer (2000).

Identification keys and general biology of the Red Wasp are given in Spradbery (1973), Archer (1979, 1996, 1997a, 19976b), Edwards (1980), Akre et al. (1981) and Else (1994).

The rarest of our four Crossocerus species with yellow-marked gasters, and regarded as possibly extinct until its recent re-discovery in Hampshire and discovery in Wales.

A small red and black wasp which is a cleptoparasite of the similar looking Harpactus tumidus (Panzer), occurring in the same sparsely-vegetated sandy areas as its host.

This large and readily identifiable pompilid would not be easily overlooked and is now probably extinct in mainland Britain. The species is, however, still recorded in the Channel Islands.