Glow-worms Lampyris noctiluca L. (Coleoptera: Lampyridae) in Essex Fig. 1. Recording coverage in 2001 (map shows 47 tetrads with survey) Fig. 2. Distribution of L. noctiluca records since 1992 (30 tetrads occupied) Creeksea (six sites) and at Langdon Hills (three sites) since 1992. Although these clusters of sites are quite close together, other colonies are much more isolated. For example, individuals were observed in the grounds of Saffron Walden's hospital during the 2001 survey, which is many kilometres from the nearest extant colony. Essex Naturalist (New Series) 19 (2002) 153