Insects of Britain and Ireland: the genera of Lepidoptera-Geometridae
Adults. Antennae of males simple. Face rough.
Wingspan 28–32 mm. The outer margin of the forewing slightly sigmoid-curved, or convexly curved. Forewings usually deep yellow or orange, varying to yellowish brown, with fuscous striae; without a clear discal mark; without a median band. Hindwings plain; usually yellow or yellow-orange, varying to yellowish brown; predominantly ochreous, or yellow, or orange; without a clear discal mark; transversely lined (with several fairly obscure, complete or incomplete lines).
Vein 10 of the forewings arising independently of 9; arising independently, anastomosing with 11 and 9 to form a double areole. Hindwings exhibiting a tubular vein 5. Vein 5 of the hindwings arising from about the middle of the transverse vein, or arising from below the middle of the transverse vein (?). 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 stalked.
Posterior tibiae of males 4-spurred.
Early stages. Larvae feeding on Rumex, etc.
British representation. 1 species (four sub-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 June and July. C. bilineata (Yellow Shell).
Illustrations. • C. bilineata (The Yellow Shell), with Epirrhoe, Costaconvexa, Entephria, Larentia, Anticlea, Mesoleuca, Nebula, Pelurga, Lampropteryx, Cosmorhoe, Nebula: Newman 1869. • C. bilineata (Yellow Shell), with Larentiinae (‘Carpets’, ‘Pugs’, etc.): Kirby 51.
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’.