Insects of Britain and Ireland: the families of Hymenoptera

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L. Watson and M. J. Dallwitz

Bethylidae

Adults minute to small; (1.5–)3–4(–10) mm long. Solitary insects.

Head. Antennal segments (11–)12 (females), or 13 (males). Antennae geniculate.

Thorax. Pronotum short, not extending back to the tegulae. Cenchri absent. Wings present, or absent (some females). Fore-wings with a conspicuous pterostigma; with the venation well developed (but reduced apically). Closed fore-wing cells 6–10. Hind-wings without closed cells. Fore femur dilated, or not noticeably dilated. Hind femur without a well defined trochantellus. Hind tibiae with spurs specialised for a cleaning rôle (?).

Abdomen. The abdomen with a marked basal constriction. The ‘waist’ simple. Visible abdominal segments 7–8. Ovipositor of females not visibly protruding; modified as a retractable sting.

Larvae. Larvae legless or the legs vestigial; parasitic on hosts selected by the mother (being external parasites of small larvae of Lepidopera and Coleoptera).

General comments. The females with simple fore-tarsi.

British representation. Species in Britain 20; Bethylus, Cephalonomia, Epyris, Goniozus, Holepyris, Laelius, Plastanoxus, Pristocera and Pseudisobrachium.

Classification. Suborder Apocrita; Series Aculeata; Superfamily Chrysidoidea (sometimes referred to the superfamily Bethyloidea).

Illustrations. • Bethylus fuscicornis Curtis: B. Ent. 720. • Bethylus fuscicornis: B. Ent. 720, legend+text. • Bethylus fuscicornis: B. Ent. 720, text cont..


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Cite this publication as: ‘Watson, L., and Dallwitz, M.J. 2003 onwards. Insects of Britain and Ireland: the families of Hymenoptera. Version: 16th May 2016. delta-intkey.com’.

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