Insects of Britain and Ireland: the genera of Lepidoptera-Geometridae
Adults. Antennae of males simple.
The outer margin of the forewing slightly sigmoid-curved, or convexly curved. Forewings pale ochreous or whitish, with curved brown stiae, base of costa dark fuscous, aquata and vitalbata with a median band brown or dark fuscous in the lower half and towards the termen; predominantly whitish, or pale ochreous; with a clear discal mark (this blackish); with a distinct median band (the band darker, fading or incomplete towards the costa), or without a median band (H. tersata). Hindwings conspicuously patterned (similarly marked to the forewings); whitish or whitish-ochreous, with fuscous striae; with a clear discal mark (H. tersata), or without a clear discal mark; transversely lined (with several fuscous lines, those of the median band darker).
Vein 10 of the forewings arising independently of 9. Hindwings exhibiting a tubular vein 5. Vein 5 of the hindwings arising from about the middle of the transverse vein, or arising from below the middle of the transverse vein (?). 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 stalked.
British representation. 3 species (one adventive); South-east England, Central-southern England, South-west England, English Midlands, and Wales. Living adults found May and June, or August (double brooded). H. aquata (Cumbrian Umber, adventive), H. tersata (The Fern), H. vitalbata (Small Waved Umber).
Illustrations. • Horisme (Phibalapteryx) virgata (Oblique Striped): B. Ent. 623. • Horisme (Phibalapteryx) virgata: B. Ent. 623, legend+text. • Horisme (Phibalapteryx) virgata: B. Ent. 623, text cont.. • H. tersata (The Fern) and H. vitalbata (Small Waved Umber), with Coenocalpe, Colostygia, Electrophaes, Eustroma, Hydriomena, Melanthia: Newman 1869. • H. vitalbata, with other Larentiinae (‘Carpets’, ‘Pugs’, etc.): Kirby 51.
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’.