Hydrophis inornatus, commonly known as the plain sea snake, is a species of venomous sea snake in the family Elapidae.

[3] South China Sea (Philippines: Panay, etc.

The tail is dark bluish gray, with three or four narrow white crossbands.

Eye large, located above the fourth upper labial.

[4] Ventrals distinct, but only slightly larger than the contiguous scales.