Insects of Britain and Ireland: the genera of Lepidoptera-Geometridae
Charissa, Sciadon, Scotopteryx.
Adults. Antennae of males dentate to simple (stout, flatly sub-dentate); shortly, evenly simply-ciliate.
Wingspan 30–38 mm (G. obscuratus), or 48–54 mm (G. obfuscaria). The outer margin of the forewing convexly curved to more or less straight. Forewings grey or brown-grey, lined and sprinkled black, or fuscous and strigulated; predominantly fuscous, or grey, or pale fuscous, or pale grey, or light brown; with a clear discal mark. The discal mark conspicuously pale-centred and dark-ringed. Forewings of the male without a fovea. The outer margin of the hindwings scalloped to smooth. Hindwings conspicuously patterned, or plain; coloured like the forewings, but lacking the first line; with a clear discal mark. The discal mark conspicuously pale-centred and dark-ringed, or not dark-ringed. Hindwings transversely lined.
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 Poterium, Helianthemum, Genista, Calluna.
British representation. 2 species; South-east England, Central-southern England, South-west England, English Midlands, Northern England, Southern Scotland, Northern Scotland, Wales, and Ireland. Living adults found July and August. G. obscuratus (Annulet or Dark Annulet, = Charissa) Curtis, G. obfuscatus (Scotch Annulet).
Illustrations. • Aleucis, Cabera, Campaea, Gnophos, Hylaea, Lomagrapha, Theria: Newman 1869. • Ennominae: Kirby 48. • Larentiinae: Gnophos obfuscatus (= Charissa Curtis. Scotch Annulet: B. Ent. 105). • Gnophos obfuscatus (~Charissa Curtis): B. Ent. 105, legend+text. • Gnophos obfuscatus = Charissa Curtis: B. Ent. 105, text cont..
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’.