Insects of Britain and Ireland: the genera of Lepidoptera-Geometridae
Adults. Antennae of males bipectinate (T. firmata), or simple. Face rough.
Wingspan 24–35 mm. Forewings relatively narrow-elongate to relatively broad. The outer margin of the forewing convexly curved. Forewings not predominantly green, yellow, or black; whitish-fuscous, grey, olive-, reddish-ochreous, ochreous-brown or brown; predominantly whitish, or ochreous, or light brown, or brown, or pale fuscous, or pale grey, or grey; with a clear discal mark (usually, this blackish), or without a clear discal mark; with a distinct median band, or without a median band (the band usually more or less conspicuously dark, but occasionally obscure); without an oblique red stripe. The outer margin of the hindwings smooth. Hindwings plain; whitish, pale fuscous or pale ochreous; predominantly whitish, or pale ochreous, or pale fuscous; not predominantly green, yellow, or black; with a clear discal mark to without a clear discal mark; transversely lined (sometimes with a faint postmedian line), or without transverse lines.
Vein 10 of the forewings arising independently of 9; arising independently, anastomosing with 11 and 9 to form a double 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 Pinus and Juniperus.
British representation. 5 species; South-east England, Central-southern England, South-west England, English Midlands, Northern England, Southern Scotland, Northern Scotland, Wales, and Ireland. Living adults found May to October (sometimes double brooded). T. cognata (Chestnut-coloured Carpet), T. cupressata (Cypress Carpet, adventive), T. firmata (Pine Carpet), T. juniperata (Juniper Carpet), T. obeliscata (Grey Pine Carpet), T. britannica (Spruce Carpet).
Illustrations. • 5 Thera spp., with Chloroclysta, Cidaria, Eulithis, Plemyria: Newman (1869). • T. juniperata (Juniper Carpet) and C. britannica (Spruce Carpet), with other Larentiinae (‘Carpets’): Kirby 50. • Larentiinae: Thera cognata (Chestnut-coloured Carpet: B. Ent. 519). • Thera cognata: B. Ent. 519, legend+text. • Thera cognata: B. Ent. 519, text cont..
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. delta-intkey.com’.