Insects of Britain and Ireland: the families of Hymenoptera

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L. Watson and M. J. Dallwitz



Adults medium sized to large; (8–)9–25 mm long.

Head. Antennal segments 4–7 (clubbed). Antennae without noticeable elongation of the third segment.

Thorax. Pronotum deeply indented or emarginate at the back. Cenchri present. Fore-wings with the venation well developed. Hind tibiae without specialised spurs.

Abdomen. The abdomen broadly sessile at its base, without a marked constriction. Ovipositor of females not visibly protruding; adapted as a saw.

Larvae. Larvae with segmented legs; phytophagous (sitting partly curled up on leaves, reconisable by a characteristic covering of waxy powder).

General comments. Adults broad bodied, with the abdomen dorso-ventrally compressed; the antennae distinctly clubbed.

British representation. Species in Britain 17; Abia, Cimbex, Trichiosoma and Zaraea being native, but dubious records only for Corynis and Pseudoclavellaria.

Classification. Suborder Symphyta; Superfamily Tenthredinoidea.

Illustrations. • Abia lonicerae (Black-horned Sawfly: B. Ent. 89). • Abia lonicerae (details: B. Ent. 89). • Abia lonicerae (dissections: B. Ent. 89). • Abia lonicerae: B. Ent. 89, legend+text. • Abia lonicerae: B. Ent. 89, text cont.. • Cimbex luteus (Ten-spotted Sawfly): B. Ent. 041. • Cimbex luteus: B. Ent. 041, legend+text. • Cimbex luteus: B. Ent. 041, text cont.. • Cimbex femoratus (Cameron II, v). female. 1a, head; 1b, antenna; 1c, tarsus. • Pseudoclavellaria amerinae (Yellow-margined Sawfly): B. Ent. 093. • Pseudoclavellaria amerinae: B. Ent. 093, legend+text. • Pseudoclavellaria amerinae: B. Ent. 093, text cont.. • Corynis crassicornis (Cameron II, v). female. 6a, head; 6b, antenna; 6c, labium; 6d, maxilla. • Pseudoclavellaria amerinae (Cameron II, v). female. 3a, head; 3b, antenna; 3c, labium; 3d, maxilla. • Trichiosoma vitelline (Orange-margined Sawfly): B. Ent. 049. • Trichiosoma vitelline: B. Ent. 049, legend+text. • Trichiosoma vitelline: B. Ent. 049, text cont.. • Trichiosoma sorbi (Cameron II, v). male. 2a, hind leg; 2b, head of male; 2c, antenna; 2d, maxilla; 2e, labrum. • Zaraea fasciata (White-belted Sawfly: B. Ent. 97). • Zaraea fasciata: B. Ent. 97, legend+text. • Zaraea fasciata: B. Ent. 97, text cont.. • Zaraea fasciata (Cameron II, v). female. male. antenna. • Larvae, cocoons, cases: Cimbex, Pseudoclavellaria, Trichiosoma, Zaraea (Cameron II, xii & xiii). 1. Trichiosoma tibiale; 1a, head; 1b, tarsus. 2. Trichiosoma latreillei; 2a, young larva. 3. Cimbex femoralis. Cocoons of (4) Pseudoclavellaria amerinae and (5) Cimbex luteus. 6. Cimbex luteus. 7. Zaraea fasciata; 7a-7c, trophi. • Larva: Trichiosoma lucorum (Cameron II, xi). 10. Trichiosoma lucorum. a &b, head; c & d, larva shortly before pupation.

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.’.