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

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L. Watson and M. J. Dallwitz

Mesoleuca Hübner

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

Wingspan 32–38 mm. The outer margin of the forewing slightly sigmoid-curved, or convexly curved. Forewings creamy white, with smoky grey margin and very dark, contrasty basal and wing-tip blotches; predominantly white, or cream; with a clear discal mark (this dark grey); with a distinct median band (if the white median fascia be so interpreted). Hindwings conspicuously patterned; creamy white, with smoky marginal band; with a clear discal mark (this dark); transversely lined (with a sharply defined, angulated, dark postmedian line in addition to the grey terminal band).

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 Alnus, Rubus, Fragaria etc.

British representation. 1 species; South-east England, Central-southern England, South-west England, English Midlands, Northern England, Southern Scotland, Wales, and Ireland. Living adults found June and July. Mesoleuca albicillata (Beautiful Carpet).

Subfamily. Larentiinae.

Illustrations. • M. albicillata (Beatiful Carpet), with Epirrhoe, Costaconvexa, Camptogramma, Entephria, Larentia, Anticlea, Pelurga, Lampropteryx, Cosmorhoe and Nebula: Newman 1869. • M. albicillata, with other Larentiinae (‘Carpets’, ‘Pugs’, etc.): Kirby 51.

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.’.