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

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L. Watson and M. J. Dallwitz

Cosmorhoe Hübner


Adults. Crepuscular and nocturnal. Antennae of males simple. Face rough.

Wingspan 28–30 mm. The outer margin of the forewing convexly curved. Forewings ochreous-white, with a dark basal fascia and median band; predominantly white, or pale ochreous, or cream; with a clear discal mark (this black); with a distinct median band (this mostly black and leaden grey, and very contrasty on the pale wing). Hindwings plain; ochreous-white, with a narrowly pale brownish termen; with a clear discal mark (this dark grey); without transverse 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 Galium.

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 in June, or July. C. ocellata (Purple Bar).

Subfamily. Larentiinae.

Illustrations. • C. ocellata (Purple Bar), with Epirrhoe, Costaconvexa, Camptogramma, Entephria, Larentia, Anticlea, Mesoleuca, Pelurga, Lampropteryx and Nebula: Newman 1869. • C. ocellata, 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.’.