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

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L. Watson and M. J. Dallwitz

Theria Hübner


Adults. Crepuscular and nocturnal; with fully developed wings, or flightless. The flightless females with rudimentary wings. Antennae of males bipectinate; bipectinate to the apex. Face smooth to rough. Tongue absent.

Wingspan 31–34 mm. Forewings brown or dark fuscous, faintly reddish tinged, the lines darker fuscous; with a clear discal mark (this dark). Forewings of the male without a fovea. Hindwings conspicuously patterned to plain; fuscous-whitish; with a clear discal mark (this rather conspicuous, dark); transversely lined (with a well defined, grey second line).

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.

Thorax smooth. Posterior tibiae of males 4-spurred.

Early stages. Larvae feeding on Crataegus, Prunus spinosa.

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 late January and February. T. primaria (Early Moth).

Subfamily. Ennominae.

Illustrations. • Aleucis, Cabera, Campaea, Gnophos, Hylaea, Lomagrapha, Theria: Newman 1869. • Oenochrominae and Ennominae: Kirby 47.

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.’.