A red long-horned beetle was collected from the common milkweed Asclepias syriaca during an arthropod survey conducted on 26 June 1999, at Konza Prairie Biological Station in Riley County, Kansas, USA. Several weeks later, on 17 July 1999, another specimen was taken at the same location, west of the historical Hokanson Homestead, again from A. syriaca. Morphological analysis identified the species as Tetraopes texanus, which was distinguished from other related species based on the distinctive shape of the eleventh (distal) antennomere and the fringes of very long setae at the apices of the antennomeres. This is the first record of T. texanus from Kansas.