The Dolichopodidae (Diptera) of Montserrat, West Indies

The long-legged flies (Dolichopodidae) of the island of Montserrat in the Lesser Antilles have been surveyed and include 63 species in 27 genera. The following eleven new species are described and illustrated: Amblypsilopusmarskeaesp. nov., Medeteraivieisp. nov., Medeteramontserratensissp. nov., Systenusladonnaesp. nov., Thrypticusmediofuscussp. nov., Chrysotusantillensissp. nov., Chrysotuscallichromoidessp. nov., Chrysotusinterfronssp. nov., Chrysotusmontserratensissp. nov., Diaphorusrobinsonisp. nov., and Sympycnusmontserratensissp. nov. Six species have only been found on Montserrat (ca. 10% endemicity). Keys are provided to the genera and species on Montserrat, their known distribution summarized, and additional new island records provided for many species. Asyndetuswirthi Robinson is synonymized with A.interruptus (Loew) and Achradoceraapicalis (Aldrich) is removed from synonymy with A.barbata (Loew). Diaphorusflavipes Aldrich is transferred to Chrysotus as a new combination. A new replacement name, Chrysotusmilvadunom. nov., is provided for the Nearctic Chrysotusparvulus Van Duzee. Lectotypes are designated for Achradoceraapicalis (Aldrich) and Asyndetusfratellus Aldrich. The fauna of Montserrat is summarized and compared with that of Dominica. Collecting methods are compared and threats to the dolichopodid fauna of Montserrat discussed.