1. Cybister tripunctatus hamatus (Montrouzier) .

Dytiscus tripunctatus Olivier, Entomologie 3 (40): 14, pl. 3, fig. 24, 1795. Dytiscus tripimctatus var. harnatus Montrouzier, Soc. Agr. Lyon, Ann. 7: 9, 1857.

Cybister tripunctatus var. hamatus (Montrouzier) Zimmermann, Coleopt. Catalog. (71): 266, 1920.

Upi Trail, May 5, in concrete reservoir, Usinger, one specimen; Inarajan, May 14, in rice field, Usinger, one specimen; Piti, Aug. 9, in pail of rain water, Swezey, one specimen; Fullaway, 1911. ( Determined by J. Balfour-Browne. One specimen retained at British Museum .)

The variety hamatus was described from Woodlark Island.