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

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L. Watson and M. J. Dallwitz

Triphosa Stephens

Adults. Crepuscular and nocturnal. Antennae of males simple. Face rough.

The outer margin of the forewing convexly curved; scalloped to smooth (waved). Forewings rosy fuscous, with dark striae; predominantly fuscous and purple, purplish, red, pinkish or rosy, or pale fuscous; with a clear discal mark (this black). The discal mark not dark-ringed. The outer margin of the hindwings scalloped. Hindwings conspicuously patterned to plain (with a sharp wavy marginal line emphasising the scalloping, but the other lines generally quite faint); lighter fuscous; with a clear discal mark (this dark); transversely lined (with several clear dark striae, and a sharp, wavy marginal one).

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 Prunus spinosa and Rhamnus.

British representation. 1 species; South-east England, Central-southern England, South-west England, English Midlands, Northern England, Southern Scotland, Wales, and Ireland. Living adults found August to December, or January to April (hibernating). T. dubitata (The Tissue).

Subfamily. Larentiinae.

Illustrations. • T. dubitata (The Tissue), with Euphyia, Pareulype, Philereme and Rheumaptera: Newman 1869. • T. dubitata, with other Larentiinae: Kirby 49.

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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.’.