Key to the British Geotrupidae
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1.
Size 10mm or, usually, less. Elytral striae well impressed and strongly punctured.
Size larger, at least 12mm. Elytral striae not strongly punctured.
2.
Entirely black. Pronotum modified; male with horns, female with a transverse ridge.
At least the underside is metallic, pronotum simply convex.
3.
Basal margin of the pronotum narrowed either side of the middle, elytra lacking striae.
Basal margin of the pronotum of equal width throughout.
4.
Pronotum distinctly punctured and elytra with granular microsculpture. Abdominal sternites evenly pubescent throughout.
Pronotum finely and diffusely punctured, appearing almost smooth. Elytra smooth. Abdominal sternites more densely pubescent laterally.
5.
Each elytron with 9 striae between the suture and the humeral callus.
Each elytron with 7 striae between the suture and the humeral callus.
6.
Habitus short and round. Outer surface of hind tibiae with 2 complete transverse ridges, including the apical ridge.
Habitus elongate, more parallel-sided. Outer surface of hind tibiae with 3 transverse ridges; that nearest the middle may be incomplete.
7.
Outer surface of hind tibiae with 3 complete transverse ridges. Punctures and pubescence on abdominal sternites more dense laterally.
Outer surface of hind tibiae with 2 complete ridges, that nearest the middle incomplete. Punctures and pubescence even across the abdominal sternites.