Insects of Britain and Ireland: the genera of Lepidoptera-Geometridae
Adults. Nocturnal (much attracted to light); relatively stout-bodied to slender-bodied. Antennae of males very strongly bipectinate; bipectinate to the apex. Face rough (roughly hairy). Eyes each crossed by a sub-antennal hair-tuft. Tongue absent.
Wingspan 46–50 mm. The outer margin of the forewing sigmoid-curved. Forewings the male rich reddish-ochreous, sprinkled fuscous, the female paler, both with dark first and second lines, a discal spot, and a whitish or grey subapical spot; with a clear discal mark (this dark fuscous). Forewings of the male without a fovea. Hindwings conspicuously patterned, or plain (the line being sharper in the male); coloured similarly to the forewings, but paler, especially basally; with a clear discal mark; transversely lined (with a median line only).
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 Quercus, Fagus, 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. Living adults found October and November. C. pennaria (Feathered Thorn).
Illustrations. • 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’.