REVISION OF TETRANYCHID (ACARINA) MITE PREDATORS OF THE GENUS FELTIELLA (DIPTERA, CECIDOMYIIDAE)

The genus Feltiella is revised and redescribed, and a key to males is given. Eight species are known: the nearly cosmopolitan Feltiella acar isuga (Vallot), new combination; Feltiella acarivora (Zehntner), new c ombination, from Java; Feltiella curtistylus Gagne from Brazil; Feltie lla insular's (Felt), new combination, from eastern United States, Wes t Indies, and Colombia; Feltiella ligulata Gagne, new species, from th e Azores; Feltiella occidentalis (Felt) from California; Feltiella pin i (Felt) from North and Central America and the West Indies; and Felti ella reducta (Felt) from New York. Larvae feed exclusively on spider m ites (Tetranychidae). The more common species are known to prey on sev eral species of mites. Therodiplosis Kieffer is a new junior synonym o f Feltiella Rubsaamen. Feltiella minuta (Felt), Feltiella tetranychi R ubsaamen, Therordiplosis persicae Kieffer, Feltiella davisi Felt, Arth rocnodax rutherfordi Felt, Feltiella americana Felt, Feltiella ithacae Felt, Therodiplosis beglarovi Mamaev, and Feltiella quadrata Kashyap are new junior synonyms of F. acarisuga (Vallot). Feltiella carolina ( Felt), Arthrocnodax constricta Felt, and Feltiella venatoria Felt are new junior synonyms of F. insularis. Feltiella acarivora (Felt), a jun ior homonym of F. acarivora Zehntner, is a new synonym of F. occidenta lis. Feltiella acerifoliae (Felt), Feltiella borealis (Felt), Feltiell a spinosa (Felt), and Feltiella macgregori (Felt) are new junior synon yms of F: pini. Five species previously assigned to Feltiella or Thero diplosis are removed either to other genera or left unplaced in the su pertribe Cecidomyiidi: Feltiella acarinivora Tolg, uncertain placement ; Mycodiplosis asiatica (Marikovskij), new combination; Therodiplosis arcuata Grover and Bakhshi, uncertain placement; Therodiplosis globata Grover, uncertain placement; and Feltiella minuta Grover, uncertain p lacement.