This species has not been studied by the present authors. According to the original description it differs from the other five members of the genus in having the comb on tergite VIII irregular or missing medially. Females are either fully winged or short winged, but only short-winged males are known (Nakahara, 1995: 239).
The genus Ewartithrips was proposed for six species from California, although separation of this from the Mediterranean genus Tenothrips has been questioned (Bhatti, 2003).
Ewartithrips dispar Nakahara
Amsinckia sp. (Boraginaceae).