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

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L. Watson and M. J. Dallwitz

Pseudoterpna Hübner

Adults. Relatively stout-bodied. Antennae of males bipectinate; apically simple. Face smooth.

Wingspan 35–40 mm. Forewings 1.75–1.85 times as long as wide. The outer margin of the forewing convexly curved. Forewings dull green, sprinkled white, with the wavy first and second lines dark green, and white-tipped cilia; with a clear discal mark (this dark green, linear). Hindwings plain; green, rather paler than the forewings and less distinctly marked; predominantly green when fresh; without a clear discal mark; faintly transversely lined (but the first line absent).

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 Leguminosae, e.g. Cytissus, Genista, Ulex. Pupae on the surface of the ground (amongst dead leaves, etc., in a thin silken cocoon).

British representation. 2 species; South-east England, Central-southern England, South-west England, English Midlands, Northern England, Southern Scotland, Wales, and Ireland. Living adults found in July. P. pruinata atropunctaria (Grass Emerald).

Subfamily. Geometrinae.

Illustrations. • Geometrinae (‘Emeralds’): Kirby 44 (part). • Geometrinae: Newman (1869).

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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.’.