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

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L. Watson and M. J. Dallwitz

Acasis Duponchel

Adults. Antennae of males simple; shortly simply-ciliate. Face smooth.

Wingspan 25–29 mm. Forewings relatively narrow-elongate to relatively broad; about 1.9 times as long as wide; predominantly green when fresh; light to dark olive green, with dark transverse lines incorporating black dots, sometimes also with whitish lines, and sometimes the median lines joined by a dark median band; with a clear discal mark (this black); with a distinct median band to without a median band (the dark band containing two light bands, thus ill-defined). Hindwings conspicuously patterned to plain; grey; predominantly grey; with a clear discal mark; transversely lined to without transverse lines (the dark outer line sometimes quite conspicuous).

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 separate.

Posterior tibiae of males 2-spurred (females also?).

Early stages. Larvae feeding on foliage of Ilex, Hedera, Acer, Cornus, etc.

British representation. 1 species; South-east England, Central-southern England, South-west England, English Midlands, Northern England, Southern Scotland, Wales, and Ireland. Living adults found May and June, or August. A. viretata (Yellow-barred Brindle).

Subfamily. Larentiinae.

Illustrations. • A.s viretata (Yellow-barred Brindle), with Aplocera, Asthena, Carsia, Chesias, Discoloxia, Euchoeca, Hydrelia, Lithostege, Lobophora, Minoa, Odezia, Pterapherapteryx, Trichopteryx: Newman 1869.


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’.

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