6.5-8.5mm. (Joy). Head and pronotum shiny black and with very fine, transverse microsculpture (X40). Eyes moderately convex, continuous with outline of head, a little longer than temples. Head with long setae around temples and from two deeply impressed punctures beside each eye. Sometimes with two impressions behind and between antennal insertions. Antennae black, insertions inside outer edges of long and prominent mandibles, segments 1-3 elongate, 4 and 5 quadrate to slightly elongate, 6-10 quadrate or weakly transverse, terminal segment strongly sinuate at apex. Palps piceous to brown, terminal segment often lighter. Pronotum slightly transverse, evenly rounded behind blunt front angles, lateral and hind margin finely bordered inside this with a series of often confluent setiferous punctures. Front margin not bordered, very narrowly yellow. Surface either side on disc with a series of three setiferous punctures, the foremost of which is just below the front margin, sometimes there is an extra puncture on one side or one may be missing but these all lie on the front half, and with several other setiferous punctures between these and the lateral margins. Sometimes there are one or two punctures in the basal third. Scutellum large and glabrous, microsculptured as pronotum. Elytra quadrate, shiny black with margins lighter, sometimes extensively so, finely and sparsely punctate and with three rows of setiferous punctures, generally 7-10 in each row. Lateral margins with long setae, these are from a series of punctures above the reflexed edge. Abdomen black with hind margins of segments narrowly yellow, side borders strongly raised. Legs dark brown, front legs often extensively lighter. Pro tarsi dilated in both sexes.
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Description from 8 Watford specimens at X20
