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

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L. Watson and M. J. Dallwitz

Hydrelia Hübner

Adults. Antennae of males simple; shortly simply-ciliate. Face smooth.

Wingspan 20–30 mm. The outer margin of the forewing slightly sigmoid-curved, or convexly curved. Forewings pale yellowish with strong ochreous-orange striae in H. flammeolaria, or whitish with grey striae in H. sylvata; with a clear discal mark, or without a clear discal mark. Hindwings conspicuously patterned, or plain; pale yellowish (H. flammeolaria), or whitish (H. sylvata); without a clear discal mark; transversely lined (H. flammeolaria with several conspicuous, dark wavy lines, those of H. sylvata obscure).

Vein 10 of the forewings arising independently of 9; arising out of 11 and anastomosing with 9 to form a simple 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 foliage of Alnus, Salix, Acer campestre.

British representation. 2 species; South-east England, Central-southern England, South-west England, English Midlands, Northern England, Southern Scotland, Northern Scotland, Wales, and Ireland (common). Living adults found June and July. H. flammeolaria (Small Yellow Wave), H. sylvata (Waved Carpet).

Subfamily. Larentiinae.

Illustrations. • H. flammeolaria and H. sylvata, with Acasis, Aplocera, Asthena, Carsia, Chesias, Discoloxia, Euchoeca, Lithostege, Lobophora, Minoa, Odezia, Pterapherapteryx, Trichopteryx: Newman 1869. • H. sylvata (Waved Carpet) and H. flammeolaria (Small Yellow Wave), 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.’.