Insects of Britain and Ireland: butterflies

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L. Watson and M. J. Dallwitz


Adults. Wingspan (24–)28–48(–50) mm. Medium built; short-bodied to medium-bodied. The eyes white-rimmed; notched or emarginate at the bases of the antennae and contiguous with the bases of the antennal sockets; hairy, or glabrous. Antennae reaching noticeably less than halfway to the wingtips to reaching about halfway to the wingtips; inserted markedly less than one half the width of the head apart. The antennal clubs gradual-elongate to abrupt (elongate). Labial palps ascending. Having all 6 legs fully developed and operational for walking. Fore-legs without a tibial epiphysis. Tibiae of middle legs 2-spurred. Posterior tibiae 2-spurred.

Forewings. Forewings apically blunt to pointed. The outer margins convexly curved to more or less straight. Uppersides of the forewings dark brown, or coppery red, or blue, or purple.

Hindwings. Hindwings broadly rounded; tailed, or not tailed. Uppersides of the hindwings conspicuously patterned, or plain.

Undersides of wings. Undersides of the hindwings with silvery-metallic markings, or without metallic markings.

Wing venation. Forewings 10 veined, or 11 veined. Forewings with 1 tubular anal vein; the anal veins of the forewings representing 1b only; vein 1b furcate proximally to simple.

Hindwings 9 veined; without a praecostal spur; with 2 anal veins; exhibiting vein 1a; the anal veins comprising 1a and 1b. 7 veins arising from the hindwing cell. The cell-derived hindwing veins 3+4 proximally joined (connate only).

Eggs, larvae, pupae. The larvae woodlouse-shaped. On Pelargonium.

Pupae smooth and rounded; conspicuously patterned, or plain; without shining-metallic markings.

British representation. 1 species. Cacyreus marshalli (Geranium Bronze).

Status in Britain. Adventive (a southern African species, occasionally reported from southern England in the 20th Century).

Distribution. Southeast England, central southern England, southwest England, and Isle of Wight.

Comments. Description inadequate.

Classification. Superfamily Papilionoidea. Lycaenidae.

Illustrations. • Cacyreus marshalli (Geranium Bronze): photos.

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. 2008 onwards. Insects of Britain and Ireland: butterflies. Version: 16th May 2016.’.