Key to the British Erotylidae
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1.
Entire insect testaceous. Fourth tarsal segment distinct, not enclosed within the lobes of the third.
Colour variable but with the head and/or pronotum contrasting with the elytra in mature specimens. Fourth tarsal segment at least partly enclosed within the lobes of the third, least obviously so in Dacne.
Anterior margins of the pronotum indistinct. Elytra almost quadrate (length along suture/maximum width.) Tarsi apparently 4 segmented; segment 4 mostly hidden under the bilobed 3rd segment.
2.
Anterior margins of the pronotum distinct. Elytra elongate; at least 1.2X longer than broad. Tarsi variable.
3.
Antennal club compact and well demarked. Elytral humerus pale. Tarsal segments not bilobed.
Antennal club loose and gradually thickened. Elytra unicolorous. Tarsal segment 3 deeply bilobed, segment 4 small but obvious at 30X.
Head and pronotum pale. [Explanate margin of pronotum broader and more evenly curved to base, but this varies] 2.5-3.3 mm.
4.
Head and pronotum dark (in mature specimens.)[Explanate margin of pronotum narrower and slightly sinuate behind the middle. This varies] 2.2-3.0mm.
5.
Elytra metallic blue. (Antennae black. Base of pronotum distinctly bordered.)
Elytra black.
Hind margin of pronotum not bordered. Antennae black with segments 1-4 and 11 paler. (Abdomen red.) 4-5.5mm.
6.
Hind margin of pronotum bordered. Antennae black or indistinctly paler towards base.
7.
Head red. Abdomen red. 4.5-7mm.
Head dark. Abdomen black. 2.7-4.5mm.