Insects of Britain and Ireland: the genera of Lepidoptera-Geometridae
Adults. Nocturnal; relatively stout-bodied. Antennae of males bipectinate; bipectinate to the apex. Face rough (with dense, projecting scales). Tongue fully developed, or absent.
Wingspan 40–46 mm. The outer margin of the forewing slightly sigmoid-curved, or convexly curved; scalloped (less so than in Odontopera). Forewings pale ochreous or cream, with dark first and second lines enclosing a shaded-brownish median band and a blackish, sometimes pale-centred discal spot; with a clear discal mark. The discal mark conspicuously pale-centred and dark-ringed, or not dark-ringed. Forewings with a distinct median band to without a median band (the band somewhat darker, but lighter in the middle). Forewings of the male without a fovea. Hindwings plain; coloured like the forewings, or paler; with a clear discal mark. The discal mark not dark-ringed. Hindwings transversely lined (with a faint median line), or without transverse lines.
Hindwings lacking a tubular vein 5. Vein 8 of the hindwings approximated to or anastomosed with the upper margin of the cell to the middle or beyond. Hindwing veins 6 and 7 separate.
Posterior tibiae of males 4-spurred.
Early stages. Larvae feeding on foliage of Corylus, Prunus spinosa, etc.
British representation. 1 species; South-east England, Central-southern England, South-west England, English Midlands, Northern England, Southern Scotland, Northern Scotland, Wales, and Ireland (common). Living adults found July and August. C. elinguaria (Scalloped Oak).
Illustrations. • Ennominae (‘Thorns’, etc.): Kirby 46. • Assorted Ennominae (‘Thorns’, with larvae): Humphreys, 1860. • Crocallis elinguaria (Scalloped Oak): photo, Giles Watson.
To view the illustrations with detailed captions, go to the interactive key. This also offers full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting or lacking specified attributes, and distributions of character states within any set of taxa.
Cite this publication as: ‘Watson, L., and Dallwitz, M.J. 2003 onwards. Insects of Britain and Ireland: the genera of Lepidoptera-Geometridae. Version: 8th June 2016. delta-intkey.com’.