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

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L. Watson and M. J. Dallwitz

Alsophila Hübner

Adults. Crepuscular to nocturnal (the males commonly attracted to light); with fully developed wings, or flightless. The flightless females apterous (spider-like). Antennae of males dentate (serrate); long fasciculate-ciliate. Face smooth.

Wingspan 34–38 mm. The outer margin of the forewing convexly curved to more or less straight. Forewings dingy fuscous-brown; with a clear discal mark (this dark fuscous, linear). Hindwings plain; pale whitish fuscous; with a clear discal mark; transversely lined (with a faint, pale, sometimes faintly dark-edged zigzag median line).

Vein 10 of the forewings arising independently of 9. Hindwings exhibiting a tubular vein 5. Vein 5 of the hindwings 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 foliage of Quercus, Ulmus, 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 March and April. A. aescularia (March Moth).

Subfamily. Alsophilinae.

Illustrations. • Agriopis, Alsophila, Apocheima, Erannis, Lycia: Newman. • Oenochrominae and Ennominae: Kirby 47. • Forewing and hindwing neuration: A. aescularia and other Geometridae.


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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