Abstract
Onthophagus tnai new species, belonging to the Onthophagus militaris species group, is described from the Western Ghats, India. Characteristics of the Onthophagus militaris species group are discussed and a modified key to the group is given. A taxonomic assessment of Onthophagus species from the montane rain forest ecoregion (MEF) in the Western Ghats, resulted in the synonymy of O. taruni Biswas & Chatterjee with O.vladimiri Frey and the reassessment of the infrageneric position of O.sahai Biswas & Chatterjee.
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