Insects of Britain and Ireland: the genera of Lepidoptera-Noctuidae

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L. Watson and M. J. Dallwitz

Rhizedra Warren

Adults. Head rough. Head without a projecting, horny frontal plate. Eyes glabrous; not ciliated. Antennae of males ciliate.

Wingspan 40–52 mm. Head and thorax coloured like the forewings, the abdomen pearly-grey. Forewings cream or light fuscous-buff; whitish, or ochreous, or cream, or pale fuscous; patterned transversely, or patterned transversely and longitudinally streaked; the patterning well marked to obscure (fairly inconspicuously streaked ochreous and paler longitidinally, with an outer transverse line of dark dots); reniform undefined; orbicular undefined; claviform undefined. Hindwings whitish, or fuscous to ochreous; plain to terminally darkened; without a clear discal mark; transversely lined (in the form of one row of dots), or without transverse lines; exhibiting vein 5. Vein 5 of the hindwings weak; arising nearer to vein 6 than to vein 4. Middle tibiae without spines. Posterior tibiae without spines; rough-scaled. Abdomen not crested.

Living adults found late July, or August to October.

Larvae, pupae. Larvae feeding on Phragmites roots; pupating within the stems of the foodplant (after gnawing upwards from the roots).

British representation. 1 species; South-east England, Central-southern England, South-west England, English Midlands, Northern England, Southern Scotland, Northern Scotland, Wales, and Ireland; lutosa (Large Wainscot).


Illustrations. • R. lutosa (Large Wainscot), with related genera: Newman. • Rhizedra lutosa (Nonagria vectis, Isle of Wight Wainscot: B. Ent. 459). • Rhizedra lutosa (Nonagria vectis): B. Ent. 459, legend+text. • Rhizedra lutosa (Nonagria vectis): B. Ent. 459, 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-Noctuidae. Version: 8th June 2016.’.