Insects of Britain and Ireland: the genera of Lepidoptera-Geometridae

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L. Watson and M. J. Dallwitz

Colostygia Hübner

Amaebe, Amoebe, Calostigia, Erinobia .

Adults. Antennae of males bipectinate. Face rough.

Wingspan 25–34 mm. The outer margin of the forewing slightly sigmoid-curved, or convexly curved. Forewings predominantly green when fresh; green, or whitish-ochreous (C. multistrigaria), with dark lines; with a clear discal mark (this dark); with a distinct median band (the band somewhat darker green, sometimes brown to blackish), or without a median band (or only very faintly distinguished). Hindwings plain; grey, or whitish-ochreous; not predominantly green, yellow, or black; with a clear discal mark, or without a clear discal mark; transversely lined (with pale postmedian and subterminal lines), or without transverse 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 Galium, Asperula.

British representation. 3 species; South-east England, Central-southern England, South-west England, English Midlands, Northern England, Southern Scotland, Northern Scotland, Wales, and Ireland. Living adults found March and April, or May and June, or July and August. C. multistrigaria (Mottled Grey), C. olivata (Beech-green Carpet), C. pectinataria (Green Carpet).

Subfamily. Larentiinae.

Illustrations. • 3 Colostygia spp., with Coenocalpe, Electrophaes, Eustroma, Hydriomena, Horisme, Melanthia: Newman 1869. • 3 species, with other Larentiinae (‘Carpets’): Kirby 50.

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.’.