Key to species of Olethrius recorded from Australia

1. Elytra strongly convergent apically, without punctures.......................... O. laevipennis

–. Elytra regularly rounded apically, moderately punctate or at least with some fine punctures near the base....................................... 2

2. Elytra with dense coarse punctures and relatively long, recumbent dense yellow pubescence; male mandibles without distinct longitudinal carina................................... O. scabripennis

–. Elytra with fine punctures at least near the base, with short, recumbent sparse setae on the disc or along the lateral margin; male mandibles with distinct longitudinal carina............ O. tyrannus ........................................... 3

3. Elytra covered with fine sparse punctures and bearing short, recumbent, fine yellowish white pubescence................... O. tyrannus tyrannus (Not recorded in Australia)

–. Elytra only with fine punctures near the base, surface glabrous, sometimes bearing sparse hairs along lateral margin......... O. tyrannus salomonum