Key to the British Cerylonidae
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1.
Compact-oval, length to width ratio about 2:1. Pronotum transverse, smoothly curved laterally and produced backwards posteriorly, with an antennal cavity behind the anterior angles. Dorsal surface distinctly pubescent. Ventrally with grooves to accommodate the legs. Frontoclypeal suture present.
Elongate-oval, length to width ratio about 2.7:1. Pronotum quadrate, lacking an antennal cavities behind the anterior angles, and weakly sinuate laterally towards the base. Dorsal surface glabrous. Ventral surface without grooves for the legs. Frontoclypeal suture absent.
2.
Dark brown to black, usually with the appendages pale and contrasting. Elytral punctation stronger, distinct to the lateral margins and apex.
Entirely testaceous, appendages not contrasting. Punctures weaker apically and evanescent laterally.
3.
Antennomeres 4-7 transverse; about twice as wide as long and more than half the width of the widest club segment. Basal pronotal fovea deeper and more distinct. Elytra broader but characteristically, more abruptly, narrowed to the apex. Dark brown to almost black when mature.
Antennomeres 4-7 quadrate or nearly so, distinctly less than half the club width. Basal pronotal fovea less impressed.
4.
Dark brown to black when mature. Pronotum broader. Elytra broader and more curved, about 1.5-1.6 times longer than wide. Punctures forming elytral striae weaker towards the apex. On average larger, 1.8-2.3mm.
Testaceous. Pronotum narrower. Elytra narrower and less curved, about 1.65-1.70mm. Punctures forming elytral striae strong to apex. On average smaller, 1.7-2.1mm.