Much information on the behaviour of Nysson and related genera is given by Evans (1966), although the nomenclature is now out of date.

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.

Being one of the larger and the most easily identified pompilids, the biology and distribution of Anoplius viaticus is comparatively well known.

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).

A scarce yellow-marked Crossocerus, closely resembling the relatively frequent C. dimidiatus, but typically with entirely yellow tibiae. This species has been variously assigned to the genera Crabro and Cuphopterus in older literature.