Insects of Britain and Ireland: the families of Hymenoptera

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L. Watson and M. J. Dallwitz

Evaniidae

Adults minute to large; 3–15 mm long.

Head. Antennal segments 13.

Thorax. Pronotum long, extending back to the tegulae. The spiracle cover lobe of the pronotum margined with close fine hairs. Cenchri absent. Fore-wings with a conspicuous pterostigma; more or less with the venation well developed (but reduced apically). Hind-wings without closed cells. Hind-wings with an anal lobe. Hind femur with a clear trochantellus. Hind tibiae without specialised spurs.

Abdomen. The abdomen with a marked basal constriction; long petiolate. The gaster with the first two segments not fused; attached high on the propodeum. Ovipositor of females visibly protruding; adapted for piercing.

Larvae. Larvae with segmented legs; parasitic on hosts selected by the mother (on Cockroach oothecae).

British representation. Species in Britain 2; Evania and Brachygaster.

Classification. Suborder Apocrita; Series Parasitica; Superfamily Evanioidea.

Illustrations. • Brachygaster minutus (Yellow-footed Evania: B. Ent. 257). • Brachygaster minutus (detail: B. Ent. 257). • Brachygaster minutus (dissections: B. Ent. 257). • Brachygaster minutus: B. Ent. 257, legend+text. • Brachygaster minutus: B. Ent. 257, 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 families of Hymenoptera. Version: 16th May 2016. delta-intkey.com’.

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