Insects of Britain and Ireland: the families of Hymenoptera
Adults small to large; 7–20 mm long.
Head. Antennal segments 13 (males), or 14 (females).
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; with the venation well developed. Hind-wings without closed cells. Hind-wings without an anal lobe. Hind femur with a clear trochantellus. Hind tibiae without specialised spurs.
Abdomen. The abdomen with a marked basal constriction. The gaster with the first two segments fused; attached high on the propodeum. Ovipositor of females visibly protruding (long); adapted for piercing.
Larvae. Larvae with segmented legs; parasitic on hosts selected by the mother (on wood-boring Coleoptera and Symphyta).
British representation. Species in Britain 1; Aulacus.
Classification. Suborder Apocrita; Series Parasitica; Superfamily Evanioidea.
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’.