The identification of British adult specimens of Sigara lateralis (Leach), Sigara concinna (Fieber), Callicorixa praeusta (Fieber) and Callicorixa wollastoni (Douglas & Scott) (Hemiptera Heteroptera: Corixidae)

The aim of this communication is to briefly review nomenclature in the genus Callicorixa, describe the variation in the dark markings on the posterior legs of all four species, describe alternative diagnostic features, and provide a key to identification based on these alternative features. Attention is also drawn to a small error in FBA Scientific Publication 50 (Adults of the British aquatic Hemiptera Heteroptera: a key with ecological notes).