A new species, Asphondylia uvarum Gagné, is reported that feeds on grape berries in southwestern USA and northern Mexico. It is described and illustrated and compared in detail to the Japanese Asphondylia baca Monzen that is also known from grape as well as other Vitaceae and Caprifoliaceae. A general description of the genus Asphondylia is presented. Asphondylia mimosae Felt and Asphondylia prosopidis Felt are removed from Asphondylia and placed as new combinations in Hemiasphondylia. Hemiasphondylia mimosae Möhn is a junior homonym and takes the available replacement name, Hemiasphondylia mimosicola Gagné.