Insects of Britain and Ireland: the genera of Lepidoptera-Geometridae
Deuteronomos, Eugonia, Odoptera.
Adults. Crepuscular and nocturnal (commonly attracted to light); mainly relatively stout-bodied. Antennae of males bipectinate; bipectinate to the apex. Face rough (with dense, projecting scales). Tongue fully developed, or absent.
Wingspan 38–52 mm. The outer margin of the forewing angulated; scalloped (often), or smooth. Forewings ochreous, light ochreous, ochreous-orange, reddish-ochreous, yellow-ochreous, or more or less yellow, usually stigulated or sprinkled fuscous and with sharp, fuscous first and second lines; without a transparent discal scar; with a clear discal mark. The discal mark not dark-ringed. Forewings of the male without a fovea. The outer margin of the hindwings angled to tailed, or rounded (or sometimes almost so, e.g. in E. quercinaria); scalloped (sometimes), or smooth. Hindwings conspicuously patterned to plain (the markings usually faint); coloured like the forewings; with a clear discal mark to without a clear discal mark. The discal mark when present, conspicuously pale-centred and dark-ringed, or not dark-ringed. Hindwings transversely lined to without transverse lines (the first line lacking, the second often faint or absent).
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 foliage of diverse deciduous trees.
British representation. 6 species (one adventive); South-east England, Central-southern England, South-west England, English Midlands, Northern England, Southern Scotland, Northern Scotland, Wales, and Ireland. Living adults found August and September, or August to October. E. alniaria (Canary-shouldered Thorn), E. autumnaria (Large Thorn), E. erosaria (September Thorn), E. fuscantaria (Dusky Thorn), E. quercaria (Clouded August Thorn, adventive based on unconfirmed old records), E. quercinaria (August Thorn), E. subsignaria (N. American adventive).
Illustrations. • ‘Thorns’ - Angerona, Apeira, Colotois, Crocallis, Ennomos, Odontopera, Selenia: Newman. • Ennominae (‘Thorns’, etc.): Kirby 46. • Assorted Ennominae (‘Thorns’, with larvae): Humphreys, 1860. • Ennomos quercaria, Clouded August Thorn (adventive?): B. Ent. 667. • Ennomos quercaria: B. Ent. 667, legend+text. • Ennomos quercaria: B. Ent. 667, 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’.