During a study still in progress on the fauna of phreatic waters of various West Indian islands, a number of isopods of the family Microparasellidae were obtained. Although material from some 20 Caribbean islands was examined, only the island of Bonaire yielded microparasellid isopods so far. These animals are described in the present paper. Up to now, the only other West Indian records for the family are those of COINEAU & BOTOSANEANU, 1973, from Cuba. The methods employed are the same as in my previous study (STOCK, 1976a) on the Antillean Thermosbaenacea. All chlorinities have been determined with the aid of an E.E.L. electric chlorinimeter.