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

DELTA home

L. Watson and M. J. Dallwitz

Lythria Hübner


Adults. Antennae of males bipectinate; bipectinate to the apex, or apically simple. Face rough (rough-haired or loose-scaled).

Wingspan 24–28 mm. The outer margin of the forewing convexly curved. Forewings olive brown, or purplish, or golden yellow with purple margins; without a clear discal mark. Hindwings plain; olive brown, or purplish, or golden yellow with purple margins; predominantly ochreous, or yellow, or purple, purplish, red, pinkish or rosy, or brown; without a clear discal mark; without transverse lines.

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.

Thorax hairy beneath. Posterior tibiae of males 4-spurred.

Early stages. Larvae feeding on Rumex, Polygonum.

British representation. 1 species (adventive); Northern England. Living adults found in June. L. purpuraria (Purple-barred Yellow, adventive based on unconfirmed old records).

Subfamily. Larentiinae.

Illustrations. • L. purpuraria (Purple-barred Yellow), with Phibalapteryx, Orthonama, Xanthorhoe and Catarhoe: Newman (1869).

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.’.