Rhynchaenus caudatus Say, 1824: 311 (type locality: USA: Missisippi; type material: N: USNM).
Listronotus caudatus; LeConte, 1876: 174.
Host plants. Polygonum bicorne Raf. (Polygonaceae) (O’Brien, 1977).
Distribution. Canada and USA (O’Brien and Wibmer, 1982).