Insects of Britain and Ireland: the genera of Lepidoptera-Geometridae
Adults. Crepuscular and nocturnal. Antennae of males simple (filiform); non-ciliate. Face smooth.
Wingspan 33–44 mm. The outer margin of the forewing convexly curved. Forewings yellow, with ferrugineous costal spots; with a clear discal mark. The discal mark conspicuously pale-centred and dark-ringed (ringed reddish brown). Forewings of the male with a fovea. Hindwings plain; yellow; predominantly yellow; with a clear discal mark (this grey). The discal mark not dark-ringed. Hindwings transversely lined (with three faint, grey, partly interupted lines).
Hindwings lacking a tubular vein 5. 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 separate.
Posterior tibiae of males 4-spurred.
Early stages. Larvae feeding on Crataegus, Betula, etc.
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 May and June. O. luteolata (Brimstone Moth).
Illustrations. • Cepphis, Epione, Isturgia, Opisthograptis, Pachycnemia, Petrophora, Plagodis, Pseudopanthera: Newman. • Ennominae (‘Thorns’, etc.): Kirby 46. • Forewing and hindwing neuration: O. luteolata 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’.