Family Isotomidae Schaeffer.
Sub-family Isotominae Schaeffer.
Genus Balljstrura (Börner, 1906).
1906 Ballistrura Börner (subgenus.of Proisoloma Börner).

I propose here that the subgenus Ballistrura henceforth be regarded as a full genus. It was erected by Börner in 1906 (Mitt.

naturh. Mus. Hamburg, 23, p. 172) as a subgeims of Proisotoma for those species of the latter genus in which the dentes were neither anuulated nor corrugated. Genotype: Ballistrura schötti (Dalle Torre).

One species of Ballistrura (B. aqutalata Salm.) is known from New Zealand, several are known from Europe and America, and Yossii recently has described several species of the genus from Japan.