Hydrovatus subtilis, is a species of predaceous diving beetle found in India, Andaman & Nicobar Islands, Sri Lanka, Indonesia, Japan, Laos, Malaysia, and Thailand.

[1][2][3][4] Body larger with a typical length of about 2.4 to 2.8 mm.

Head between eyes is not margined.

Male with stridulation apparatus on metacoxal plates along suture close to metathorax.

This Dytiscidae-related article is a stub.