Dieckmanniellus gracilis (Redtenbacher, 1849) 

This is a very restricted and local species in the U.K. with a few scattered records from the south east of England; Berkshire, Dorset, Hampshire, Isle of Wight, Surrey and Sussex. It occurs in marginal and wetland areas, often in shaded situations, on Lythrum portula. Adults occur on leaves and flowers while the larvae feed within the stems, causing galls. Adults are active from May to August. Beyond the U.K. it is widespread across central and southern Europe and North Africa.

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Typical specimens are black with the apical two thirds of the elytra pale orange or yellow with the suture and one or two spots black. The rostrum is black, the antennal scape pale, the funiculus pale to black and the club black. Legs red, with the coxae, the apices of the femora and the tarsi black. This species is distinct among the northern European members of the family in having two teeth on the inner femoral margins.