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

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L. Watson and M. J. Dallwitz

Orthonama Hübner

Nycterosea, Nyctosia, Percnoptilota, Plemyria.

Adults. Antennae of males very shortly bipectinate, or simple. Face rough.

Wingspan 22–28 mm. The outer margin of the forewing convexly curved. Forewings not predominantly green, yellow, or black; pale greyish-ochreous, greyish-purplish or whitish-ochreous, with faint darker striae; with a clear discal mark (this dark in a pale ring, in obstipata, a round black dot in vittata); without a median band; without an oblique red stripe. The outer margin of the hindwings slightly angled, or rounded; smooth. Hindwings plain; pale grey or whitish-ochreous, sometimes terminally tinged ochreous or purplish; predominantly whitish, or pale ochreous, or purple, purplish, red, pinkish or rosy, or pale grey; not predominantly green, yellow, or black; with a clear discal mark to without a clear discal mark; transversely lined (with several fairly faint 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 Polygonum, Agrimonia, Galium, etc.

British representation. 2 species; South-east England, Central-southern England, South-west England, English Midlands, Northern England, Southern Scotland, Northern Scotland, Wales, and Ireland. Living adults found May and June, or July, or September to December, or January to May (when hibernating). O. obstipata (The Gem), O. vittata (Oblique Carpet).

Subfamily. Larentiinae.

Illustrations. • O. obstipata (The Gem) and O. vittata (Oblique Carpet), with Lythria, Phibalapteryx, Xanthorhoe and Catarhoe: Newman (1869). • O. vittata (Oblique Carpet), 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.’.