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

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L. Watson and M. J. Dallwitz

Pachycnemia Stephens

Adults. Antennae of males dentate to simple (stout, flatly sub-dentate); shortly, evenly simply-ciliate.

Wingspan 28–32 mm. Forewings relatively narrow-elongate. The outer margin of the forewing convexly curved. Forewings fuscous, sprinkled whitish, with an obscure, dotted, dark postmedian line; with a clear discal mark (this dark fuscous). Forewings of the male without a fovea. Hindwings plain; whitish fuscous, lighter than the forewings; without a clear discal mark; transversely lined to without transverse lines (at most with a very faintly darkened 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.

Posterior tibiae of males 4-spurred.

Early stages. Larvae feeding on Calluna and Erica.

British representation. 1 species; South-east England, Central-southern England, and South-west England (local). Living adults found in May. Pachycnemia hippocastanaria (The Horse Chestnut).

Subfamily. Ennominae.

Illustrations. • Pachycnemia hippocastanaria (The Horse Chestnut): B. Ent. 611. • Pachycnemia hippocastanaria: B. Ent. 611, legend+text. • Pachycnemia hippocastanaria: B. Ent. 611, text cont.. • Cepphis, Epione, Isturgia, Opisthograptis, Pachycnemia, Petrophora, Plagodis, Pseudopanthera: Newman.

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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.’.