Byrsax egenus is a species of darkling beetle in the subfamily Tenebrioninae, and the tribe Bolitophagini.
It was first described in 1866 by Francis Polkinghorne Pascoe. B. coxi is considered a synonym.Carter, H.J. (1937) Some new Tenebrionidae in the South Australian Museum; together with notes and descriptions of other Australian Coleoptera. Transactions of the Royal Society of South Australia 61: 121-144, pls V, VIII
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