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This family has two representatives in Britain, both of which are Dicranocephalus species. Despite their large size and bold markings, they are difficult to separate externally. Habitat and host plant are a very useful guide to identification. D. agilis is larger and more elongate.
D. agilis is a scarce species confined to sand dunes in southern and south-west Britain, where it is associated with portland spurge and sea spurge. Adults overwinter and mate in May, the new generation appearing from August onwards.
Compare: D. medius
Adult: All year
Length 12-14 mm
|Adult on foodplant: north Wales (July 2009) ©Tristan Bantock
|Adult: south Wales (May 2009) ©Barry Stewart
||Adult on foodplant: north Wales (July 2009) ©Tristan Bantock
|Adults: north Wales (June 2008) ©Tristan Bantock
||Early instar nymph: north Wales (July 2010) ©Tristan Bantock
|Mid instar nymph: north Wales (July 2010) ©Tristan Bantock
||Final instar nymph: north Wales (September 2007) ©Tristan Bantock