A survey of plant inhabiting mesostigmatid mites was recently conducted in the Dominican Republic. Phytoseiidae was by far the most represented family, with 12 species. Amblyseius tamatavensis Blommers was the most common species; it was reported from four provinces on five plant species. Two species of Ascidae, four of Blattisociidae and three of Melicharidae were also found. Four blattisociid species of the genus Lasioseius are here described for the first time, namely Lasioseius dominicensis n. sp., Lasioseius oryzae n. sp., Lasioseius prorsoperitrematus n. sp. and Lasioseius sanchezensis n. sp.. Morphological information about all other species collected is presented.