Apoderus coryli (Linnaeus, 1758)

Female
Locally common and sometimes abundant throughout southern England and into the midlands, most Welsh records are from the west (NBN, June 2009), southern Scotland; Dumfries and Roxburgh (Morris). In the UK the host plant is Corylus avellana (hazel; Fowler quotes 'young hazel') although on the continent it occurs on 'various broadleaf trees, mostly on hazel'. Typical habitat is woodland, wooded parkland or hedgerows etc, where the host is present and they seem to prefer open sunny positions. We have not (yet) recorded the species from our Watford area but are confident of eventually doing so, Corylus is common locally albeit somewhat sparse in local woodland, and Apoderus occured regularly through the 1980'sand 1990's some 10KM to the south of Watford in the Rusilip woods. The specimens featured were swept from hazel in an overgrown mixed broadleaf hedge (including Acer campestris, Crataegus monogyra and Fagus sylvatica) in southwest Bucks during June 2009. Adults occur during June and July and are easiest recorded by beating or sweeping the host although they are sometimes conspicuous on the leaves basking in hot sunshine. Females deposit eggs onto the leaf surface; after oviposition the mid rib is eaten through and the leaf rolled around the eggs. Commenting on central European populations Hurka states that the larvae develop and pupate in leaf rolls which do not fall to the ground and, in good years, there may be a second generation which overwinter in fallen leaf rolls.

5.9-8mm (Morris, 1990). Head entirely shiny black or with an obscure rufous macula laterally towards base of temples, vertex finely punctate and transversely wrinkled, temples strongly constricted to a short, dull and strongly sculptuerd neck. Eggs strongly convex and protruding, cuticle between eyes more strongly punctured and with well-impressed oblique frontal furrows. Rostrum only slightly elongate, moderately stongly punctured dorsally and raised over front of scrobes which lie transversely in front of eyes. Antennae entirely black, inserted at front (top) of scrobes, basal segment not modifyed into a scape, three terminal segments densely pubescent and forming a weak club. Pronotum transverse, sides evenly rounded to projecting front margin, not bordered laterally and with two, sometimes obscure, transverse furrows in front of base. Surface smooth and shiny, very finely punctured. Scutellum black; large and broad, basal third flat, strongly punctured and microsculptured and so dull, apical two thirds raised and shiny or with a few fine punctures. Elytra slightly elongate, lateral margins sinuate and strongly edged, humerus projecting over margins. Each with a complete and sharply impressed sutural stria which lacks large punctures, then with ten rows of very strong punctures which may become confused around the centre. Cuticle finely punctate and transversely rugose and so they appear a little less shiny than the pronotum. Legs long; femora clavate, red with apical third or so and sometimes base narrowly black. Tibiae red with base and apex to some extent black, inner surface covered with small tubercles which bear fine, apically directed spines, in our specimens these are better developed in the female. Claws fused at base. Male with a single inwardly curved claw-like tooth at the apex of each tibiae and the head behind eyes narrower. Female with two such claws and head bulbous behind eyes.

Description from 3 Bucks specimens at X20


Female

Male


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