Insects of Britain and Ireland: the genera of Lepidoptera-Geometridae
Adults. Antennae of males simple; simply-ciliate.
Wingspan 35–43 mm. The outer margin of the forewing slightly sigmoid-curved, or convexly curved. Forewings grey-whitish; without a clear discal mark; with a distinct median band (this dark-margined, with a continuous pale central band). Hindwings plain; pale fuscous; with a clear discal mark (this darker); transversely lined (with a faint postmedian line).
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.
Early stages. Larvae feeding on Hypericum.
British representation. 3 species (1 adventive); South-east England, Central-southern England, South-west England, English Midlands, Northern England, Southern Scotland, Northern Scotland, Wales, and Ireland. Living adults found May and June, or August and September (double brooded). A. efformata (The Lesser Treble-bar), A. plagiata (The Treble-bar), A. praeformata (Purple Treble-bar, adventive).
General comments. Front tibiae with a horny apical hook.
Illustrations. • A. plagiata (Treble-bar) with Acasis, Asthena, Carsia, Chesias, Discoloxia, Euchoeca, Hydrelia, Lithostege, Lobophora, Minoa, Odezia, Pterapherapteryx, Trichopteryx: Newman 1869. • Comparing Aplocera plagiata and A. efformata (Lesser Treble-bar). • A. plagiata, with Carsia and other Larentiinae: Kirby 49.
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’.