Canacidae and Australimyzidae (Diptera) collected by Danish Scientific Expeditions and by N. L. H. Krauss, with descriptions of four new species

Four new species of the beach fly family Canacidae are described, and some new records of both canacid and australimyzid flies from the field collections carried out by Danish Scientific Expeditions and by the entomologist N.L.H. Krauss are given. Nocticanace kraussi sp. nov., Masoniella darwini sp. nov., Pelomyia fuegina sp. nov. and Dasyrhicnoessa celata sp. nov. are described from the Cook Islands (Polynesia), southern Patagonia, Tierra del Fuego, and the Bismarck Islands, respectively. Two other possibly new species, each represented by a single female, are briefly described and discussed but not named herein. Updated keys to the species of Masoniella Vockeroth and of the melanocera-group ofPelomyia Williston are also provided.