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

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L. Watson and M. J. Dallwitz

Semiothisa Hübner

Arte, Chiannia, Chiasmia, Eupelis, Eupisteria, Grammatophora, Halia, Hercyna, Itama, Itame, Macaria, Speranza, Strenia.

Adults. Diurnal (S. clathrata, S. carbonaria), or crepuscular and nocturnal. Antennae of males bipectinate, or dentate; when bipectinate, apically simple. Face rough (with projecting scales).

Wingspan 23–37 mm. The outer margin of the forewing convexly curved, or sigmoid-curved, or angulated; scalloped, or smooth. Forewings ochreous-whitish, whitish-fuscous, pale fuscous, ferrugineous, pale yellowish, white or yellowish-white, usually strigulated darker; with a clear discal mark, or without a clear discal mark; eye-spotted above (S. notata), or without eye-spots above. Forewings of the male with a fovea. The outer margin of the hindwings rounded (S. brunneata), or angled to tailed; scalloped to smooth. Hindwings conspicuously patterned, or plain; with ground colour more or less as in forewings; not predominantly green, yellow, or black; with a clear discal mark, or without a clear discal mark; transversely lined (the lines distinct or obscure, the first often absent).

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 diverse Dicot trees, shrubs and herbs, also Pinus.

British representation. 9 species (2 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 to August. S. alternaria (Sharp-angled Peacock), S. brunneata (= Itame, Rannoch Looper), S. carbonaria (Netted Mountain Moth), S. clathrata (Latticed Heath), S. signaria (adventive), S. liturata (Tawny Barred Angle), S. notata (Peacock Moth), S. praeatomata (adventive), S. wauaria (V-Moth).

Subfamily. Ennominae.

Illustrations. • British Abraxas, Ligdia, Lomaspilis and Semiothisa (including Itame, Macaria): Newman. • Oenochrominae and Ennominae: Kirby 47. • Ennominae: Semiothisa (Macaria) liturata (Original generic description. Tawny-barred Angle: B. Ent. 132). • Semiothisa (Macaria) liturata: B. Ent. 132, legend+text. • Semiothisa (Macaria) liturata: B. Ent. 132, text cont.. • Semiothisa (Macaria, Itame) brunneata (Rannoch Looper: B. Ent. 225). • Semiothisa (Macaria, Itame) brunneata: B. Ent. 225, legend+text. • Semiothisa (Macaria, Itame) brunneata: B. Ent. 225, text cont..

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.’.