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 46–50 mm. The outer margin of the forewing angulated; scalloped. Forewings brown with dark first and second lines, or (ab. nigra) blackish with a lighter second line only, with a dark-ringed discal spot; predominantly brown, or blackish; with a clear discal mark. The discal mark conspicuously pale-centred and dark-ringed. Forewings of the male without a fovea. The outer margin of the hindwings rounded; often slightly scalloped, or smooth. Hindwings conspicuously patterned to plain; coloured like the forewings, but paler; with a clear discal mark (this dark-ringed). The discal mark conspicuously pale-centred and dark-ringed. Hindwings transversely lined (the first line lacking, the second dark and sharp).
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 Betula, Corylus, 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 May and June. O. bidentata (Scalloped Hazel).
Illustrations. • Odontopera bidentata (Scalloped Hazel): light and melanic (photos). • Ennominae (‘Thorns’, etc.): Kirby 46. • Assorted Ennominae (‘Thorns’, with larvae): Humphreys, 1860.
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’.