Insects of Britain and Ireland: the genera of Lepidoptera-Geometridae
Adults. Antennae of males dentate; simply-ciliate. Face smooth.
Wingspan 29–34 mm. Forewings 1.7–1.8 times as long as wide. The outer margin of the forewing convexly curved, or sigmoid-curved. Forewings green; without a clear discal mark. The outer margin of the hindwings angled. Hindwings conspicuously patterned (via a chequered marginal line); green; predominantly green when fresh; with a clear discal mark, or without a clear discal mark; transversely lined (the first line faint or absent).
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 (likewise the female).
Early stages. Larvae feeding on first on various low-growing plants, the after hibernation on foliage of birch, blackthorn, oak and other deciduous trees and shrubs. Pupae above the ground (in a loose silken cocoon spun amongst the foliage of the food-plant).
British representation. 1 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. aestivaria (Common Emerald).
Illustrations. • Geometrinae (‘Emeralds’): Kirby 44 (part). • Geometrinae: Newman (1869). • Forewing and hindwing neuration: H. aestivaria and other Geometridae.
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’.