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

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L. Watson and M. J. Dallwitz

Alcis Curtis

Adults. Crepuscular and nocturnal. Antennae of males bipectinate; apically simple. Face rough.

Wingspan 29–54 mm. The outer margin of the forewing convexly curved, or convexly curved to more or less straight. Forewings light ochreous brown, sprinkled dark and sometimes whitish, with dark wavy transverse lines; or (commonly in some localities) melanic; predominantly pale ochreous, or ochreous, or light brown, or blackish, or black; with a clear discal mark (this blackish, sometimes joined with a costal mark). The discal mark not dark-ringed. Forewings of the male with a fovea. The outer margin of the hindwings scalloped to smooth. Hindwings conspicuously patterned; similarly coloured to the forewings - light ochreous brown, sprinkled dark and sometimes whitish, or (commonly in some localities) melanic; not predominantly green, yellow, or black, or predominantly black; transversely lined (with dark wavy lines).

Hindwings lacking a tubular vein 5. 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 4-spurred.

Early stages. Larvae feeding on foliage of Quercus, Betula, Prunus spinosa, etc., or (jubata) on lichens.

British representation. 2 species (with 3 subspecies of A. repandata); South-east England, Central-southern England, South-west England, English Midlands, Northern England, Southern Scotland, Northern Scotland, Wales, and Ireland. Living adults found July and August. A. jubata (Dotted Carpet), A. repandata (Mottled Beauty).

Subfamily. Ennominae.

Illustrations. • A. repandata (Mottled Beauty) and A. jubata (Dotted Carpet), with Biston, Cleora, Cleorodes, Deileptenia, Fagivorina, Menophra, Ourapteryx, Peribatodes, Selidosema: Newman. • Alcis repandata: pale and melanic forms (photos). • Ennominae: Kirby 48.

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.’.