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Criomorphus williamsi
Family: Delphacidae

A reasonably distinctive species in a small genus. The brown forewings are pale at the tip, and the pronotum is similarly banded. The frons has white keels, edged with dark brown, and is paler brown between, with the central keels converging around the base.

Unlike the common C. albomarginatus, the frons is not dark between the two inner keels. In males, the abdomen is largely black, except for a pale apical margin. The dark streaks on the tibiae may also separate it from C. albomarginatus, but this has not been confirmed. The male genital segment is pear-shaped from behind, rather than triangular.

A local species restricted to central England, and unknown outside the UK. It is found on grasses, usually in lush, damp places such as woodland edges.

Adult: May to July
Length 2.5-4.5 mm
Criomorphus williamsi
Adult female: Huddersfield (June 2008) ©Joe Botting

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Adult: Huddersfield (June 2008) ©Joe Botting