Five new species of Hydrellia are described and illustrated from adult specimens which were reared from aquatic macrophytes at the Commonwealth Inst. of Biol. Control in Pakistan. Hydrellia ghanii, new species, reared from Potamogeton crispus Linn., P. perfoliatus Linn., and Vallisneria spiralis Linn., is similar in its wide genae to H. argyrogenis Becker. Hydrellia laffooni, new species, reared from P. perfoliatus Linn., and H. pakistanae, new species, reared from Hydrilla verticillata (Linn.) Royle have uncertain affinities. The new species H. indicae and H. warsakensis, reared respectively from Potamogeton indicus Roxb. and Vallisneria spiralis Linn., are in the H. geniculata species group.