Anteros acheus is a species of butterfly of the family Riodinidae, found in Brazil, Suriname and Bolivia. It was first described by Caspar Stoll in 1781.
(Description of A. a. ampyx) Upperside: Antennae white, brown at their extremities. Thorax, abdomen, and wings brown; the anterior wings having two oval straw-coloured spots placed near the middle, and the anterior edges of the posterior ones streaked with the same colour.
Underside: Palpi, breast, legs, and abdomen straw coloured. Wings straw coloured, being spotted and streaked with red brown, each of these markings appearing to have a gold spot or streak in its centre, forming a very beautiful and singular appearance. Margins of the anterior wings entire, but of the posterior ones a little dentated. Wingspan inches (44 mm).