Mythimna infrargyrea is a species of moth in the family Noctuidae that was first described by Max Saalmüller in 1891. It is known from Madagascar.
This species has a wingspan of 26–28 mm.Saalmüller (1892). Abhandlungen der Senckenbergischen Naturforschenden Gesellschaft - Lepidopteren von Madagaskar, 17. Band, Pos. No. 583, fig. 158
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