Ianius is a monotypic moth genus in the family Erebidae described by Richards in 1939. Its only species, Ianius mosca, was first described by Harrison Gray Dyar Jr. in 1910. It is found in Mexico and the southern United States, where it has been recorded from Texas. The wingspan is about 30 mm. Adults are on wing from March to May and in September. References Melipotini Moths described in 1910 Monotypic moth genera