Insects of Britain and Ireland: the genera of Lepidoptera-Geometridae
Adults. Crepuscular and nocturnal; slender-bodied; with fully developed wings, or flightless. The flightless females with rudimentary wings. Antennae of males bipectinate; apically simple. Face smooth, or rough (haired). Tongue fully developed, or absent (?).
Wingspan 31–44 mm. The outer margin of the forewing convexly curved to more or less straight. Forewings whitish with fuscous variants (A. leucophaearia), orange-yellow (A. aurantiaria) or light to dark brown (A. marginaria); without a transparent discal scar; with a clear discal mark (this dark), or without a clear discal mark; with a distinct median band (A. leucophaearia often with a clearly defined light band), or without a median band; without an oblique red stripe. Forewings of the male without a fovea. Hindwings conspicuously patterned to plain (depending on conspicuousness of the outer transverse line); whitish, pale yellowish or light to darkish brown, paler than the forewings; not predominantly green, yellow, or black; with a clear discal mark, or without a clear discal mark; transversely lined (the outer line more or less conspicuous, and often with a submarginal row of dark dots), or without transverse lines (these very faint or detectable only near the hind margin in A. leucophaearia).
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.
Thorax crested. Posterior tibiae of males 4-spurred.
Early stages. Larvae feeding on foliage of diverse deciduous trees.
British representation. 3 species; South-east England, Central-southern England, South-west England, English Midlands, Northern England, Southern Scotland, Northern Scotland, Wales, and Ireland. Living adults found February and March (A. leucophaearia, A. marginaria), or October and November (A. aurantiaria). A. leucophaearia (Spring Usher); A. aurantiaria (Scarce Umber); A. marginaria(Dotted Border).
Illustrations. • Agriopis leucophaearia (Spring Usher), A. marginaria (Dotted Border), A. aurantiaria (Scarce Umber): male variants (photos). • Agriopis, Alsophila, Apocheima, Erannis, Lycia, Phigalia: Newman. • Oenochrominae and Ennominae: Kirby 47.
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’.