Insects of Britain and Ireland: the genera of Lepidoptera-Geometridae
Adults. Antennae of males simple (filiform); simply-ciliate. Face smooth.
Wingspan 24–27 mm. Forewings 1.6–1.8 times as long as wide. The outer margin of the forewing convexly curved. Forewings green; without a clear discal mark. The outer margin of the hindwings angled. Hindwings conspicuously patterned; green; predominantly green when fresh; without a clear discal mark; transversely lined (with a contrasty, light second line).
Vein 10 of the forewings arising out of vein 9. Hindwings exhibiting a tubular vein 5. Vein 5 of the hindwings arising from well above the middle of the transverse vein. Vein 8 of the hindwings shortly anastomosed basally with the upper margin of the cell, thence rapidly diverging. Hindwing veins 6 and 7 stalked.
Posterior tibiae of males 2-spurred (female not recorded).
Early stages. Larvae feeding on heather, sallow, birch, hawthorn. Pupae above the ground (within leaves of the food-plant drawn together by silken strands).
British representation. 1 species; South-east England, Central-southern England, South-west England, English Midlands, and Northern England (local). Living adults found May and June. C. viridata (Small Grass Emerald).
Illustrations. • Geometrinae (‘Emeralds’): Kirby 44 (part). • Geometrinae: 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. delta-intkey.com’.