Examining the crabs of the family Xanthidae from the Palau Islands depesited in the Zoological Laboratory, Kyushu University, the authors were able to record the following two new species which are designated as Chlorodiella corallicola sp. nov. and Pilodius serenei sp. nov. The former was obtained by dredging in rather shallow water, and the latter from the interrtidal zone of the coral flat reef. The most important studies on the genus Chlorodiella were carried out by Forest and Guinot (1961). Those species of the genus seem to be very close each other, and at present about seven species are known from the Indo-Pacific regions. The genus PiZodius was extensively studied by Serene and Nguyen van Luom (1958, 1959), Guinot (1958), and also Forest and Guinot (loc. cit.). Those studies revealed about fifteen species of the genus from the Indo-Pacific regions. Three species otherwise were recorded by Edmondson (1962) from the Hawaiian Islands.
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