EEDESCKIPTION OF TYPES OF AMERICAN MUSCOID FLIES IN THE COLLECTION OF THE VIENNA NAT-URAL HISTORY MUSEUM, WITH INCIDENTAL NOTES By J. M. Aldrich Associate Curator, Division of Insects, United States National, Museum The Vienna Natural History Museum contains a large amount of type material in the American muscoid flies. This is principally in the species described by Wiedemann^ in 1830, by Schiner ^ in 1868, and by Brauer and Bergenstamm^ in parts 4, 5, and 6 of their series called " Zweifliigler des Kaiserlichen Museums zu Wien." The last-named series contains many new genera based on new species and those of Wiedemann and Schiner. The authorities of the Vienna Museum a few years ago indicated a willingness to lend the American types to this museum for study, and I have availed myself of their liberality so far as to borrow six lots, numbering in all 110 species. I have reported on 79 of these in three articles published in the Annals of the Entomological Society of America.* On account of the magnitude of the project it is thought best to continue it in the Proceedings of the Museum, and the remainder thus far studied are included in the present paper. The study of these types has verified many identifications in the United States National Museum, demonstrated the synonomy of many genera and species, and furnished more complete data than formerly existed for the future identification of a considerable number of species not as yet represented in this museum. ^ Aussereuropaische Zweifliigelige Insekten, 2 volumes. 2 Diptera der Novara Reise, 1 volume., ^ .Denkschriften der Kaiserlichen Akademie der Wissenschaften ; part 4 is in vol. 56, 1889, pp. 1-180, with 11 plates ; part 5 in vol. 58, 1891, pp. 305-446 ; and part 6 in vol. 60, 1893, pp. 89-240. * Vol. 17, 1924, pp. 209-218 ; vol., 18, 1925, pp. 107-130^nd 456-469. No. 2703.— Proceedings U. S. National Museum, Vol. 72, Art. 7 55415—27 1 '
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