Insects of Britain and Ireland: the genera of Lepidoptera-Geometridae
Calocalpe, Eucosmia, Eulype, Melanippe.
Adults. Diurnal (R. hastata), or crepuscular and nocturnal. Antennae of males simple; simply-ciliate. Face rough (with a short cone of scales).
Wingspan 28–48 mm. The outer margin of the forewing convexly curved; scalloped (or waved), or smooth. Forewings light ochreous brown, whitish ochreous, or white; predominantly white, or whitish, or pale ochreous, or light brown; with a clear discal mark (this dark), or without a clear discal mark (unless it is represented by a white spot in a costal black fascia, in R. hastata). The discal mark not dark-ringed. Forewings with a distinct median band to without a median band (the darkening of the band variously conspicuous to inconspicuous, often interrupted in R. hastata, sometimes undetectable). The outer margin of the hindwings scalloped (in cervinalis and undulata), or smooth. Hindwings conspicuously patterned; coloured and patterned like the forewings; not predominantly green, yellow, or black; with a clear discal mark to without a clear discal mark; transversely lined (usually with several conspicuous, darker wavy lines, but these represented by broken, very dark fasciae or dotted lines in R. hastata).
Vein 10 of the forewings arising independently of 9; arising independently, anastomosing with 11 and 9 to form a double areole, or arising out of 11 and anastomosing with 9 to form a simple areole (R. hastata). 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.
Posterior tibiae of males 4-spurred.
Early stages. Larvae feeding on Berberis (R. cervinalis), Salicaceae (R. undulata), Myrica and Betula (R. hastata).
British representation. 4 species; South-east England, Central-southern England, South-west England, English Midlands, Northern England, Southern Scotland, Northern Scotland, Wales, and Ireland. Living adults found May, or June and July. R. cervinalis (Scarce Tissue), R. hastata (Argent and Sable), R. undulata (Scallop Shell).
Illustrations. • R. cervinalis (Scarce Yissue), R. hastata (Argent and Sable) and R. undulata (Scallop Shell), with Euphyia, Pareulype, Philereme, Triphosa: Newman 1869. • R. cervinalis and R. undulata, with other Larentiinae: Kirby 49.
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’.