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Great Falls Park, Fairfax, Virginia, USA
latitude: 38.979301
longitude: -77.241798
Precision of location: Gauged from chart or map
Site Named Here: By name of island, bay, strait, lake, river, or stream, etc., named in source publication
| Phagocata gracilis | Aug 31, 1965-Oct 1968 | in stream behow ruins of old mill, bottom stones and mud. Under stones and among leaf litter several specimens collected on various occasions between 31 August 1965 and October 1968, at water temperatures varying between 12.8 and 24.5 degrees C. |