Marine Biology Research Division

The Malayan Gerridae are monographed based mainly on the collections made by the authors. Of the total of 41 species recorded from Malaya, 4 species are being described elsewhere and are designated here without specific names. All the species are described and figured except Stenobates biroi which we have not collected. Keys to the genera and species are included. Notes on biology and distribution are also given. The Malayan gerrid fauna is both rich and varied and includes 18 genera, representing all six subfamilies of the Gerridae.