[Synanthropic flies in an 11-story apartment house in Gdańsk]

About 2500 specimens belonging to Diptera were collected. The family Muscidae was most numerously represented with 51.6% of the flies caught. 5 of the 18 species were dominant: Fannia canicularis, Muscina stabulans, Lucilia sericata, Protophormia terraenovae, Calliphora vicina. Comparison of the material from the 3 localities showed up differences in both qualitative and quantitative content.