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

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L. Watson and M. J. Dallwitz

Geometra Linnaeus

Adults. Nocturnal (readily attracted to light); relatively stout-bodied (in the female), or slender-bodied. Antennae of males bipectinate; bipectinate to the apex. Face smooth.

Wingspan 50–64 mm. Forewings 1.4–1.5 times as long as wide. The outer margin of the forewing convexly curved. Forewings green; with a clear discal mark (this darker green, linear); without a median band. The outer margin of the hindwings scalloped. Hindwings conspicuously patterned; green; predominantly green when fresh; with a clear discal mark (this darker green); transversely lined (second and subterminal lines whitish, waved or dotted).

Vein 10 of the forewings arising out of vein 9. Hindwings exhibiting a tubular vein 5. Vein 5 of the hindwings arising from well above the middle of the transverse vein. Vein 8 of the hindwings shortly anastomosed basally with the upper margin of the cell, thence rapidly diverging. Hindwing veins 6 and 7 separate.

Posterior tibiae of males 4-spurred.

Early stages. Larvae feeding on foliage of Betula, Corylus and Fagus, both before and after hibernation. Pupae on the surface of the ground (in a flimsy silken web, among dead leaves).

British representation. 1 species; South-east England, Central-southern England, South-west England, English Midlands, Northern England, Southern Scotland, Northern Scotland, Wales, and Ireland (rather common). Living adults found in July. G. papilionaria (Large Emerald).

Subfamily. Geometrinae.

Illustrations. • Geometra papilionaria (Large Emerald: Shaw and Nodder, about 1812). • Geometra papilionaria (Large Emerald: Shaw and Nodder, text). • Geometrinae (‘Emeralds’): Kirby 44 (part). • Geometrinae: Newman (1869). • neuration: Geometriinae, Archiearinae, Larentiinae.

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.’.