Five halacarid species, found in the mesopsammal of Caribbean Islands, are described, viz. Halacarellus tropicalis n. sp., Copidognathus grandiosus n. sp., Agaue arubaensis n. sp., Scaptognathus ornatus n. sp., and Limnohalacarus cultellatus Viets, 1940. H. tropicalis is the first member of the genus Halacarellus reported from tropical beaches.