Catocala herodias, the Herodias underwing or Gerhard's underwing, is a moth of the family Erebidae. The species was first described by Strecker in 1876. The nominate form is found in the US states of Texas and Oklahoma. Subspecies Catocala herodias gerhardi is found from Massachusetts, Connecticut, New York to Virginia. The gerhardi subspecies is listed as endangered in Connecticut.