Thallisellites augustinusii Lyubarsky et Perkovsky sp. nov. (Erotylidae: Languriinae, Thallisellini) is described from the late Eocene Baltic amber. Extant species of the tribe Thallisellini are Neotropical. New species differs from Thallisellites olgae in the slightly developed anterolateral angles of the pronotum; pronotal maximum width in anterior angles; short antennae, and the absence of the pronotal basal short longitudinal keel.