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Family Gyrinidae - Whirligig Beetles

Whirlygig Beetle - Dineutus ciliatus Whirlygig beetle, 3:38pm - Gyrinus aquatic larva - Dineutus Gyrinus sp. - Gyrinus plicifer scurrying black water beetles - Dineutus Gyrinidae species possible? - Dineutus Whirligig Beetle - Gyrinus
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Adephaga (Ground and Water Beetles)
Family Gyrinidae (Whirligig Beetles)
Identification
4 Neartic Genera

Spanglerogyrus - < 3mm (1 sp. South, East)
Gyretes - 3-5mm; pronotal/elytral margins pubescent (4 spp. West, South)
Dineutus - 9-15 mm (41 spp. Widespread)
Gyrinus - 4-7 mm (14 spp Widespread)

That should be all you need to key it out... be sure to give a size when you post something
Print References
America Beetles, Vol. 1, Chapter 7 (1)
Works Cited
1.American Beetles, Volume I: Archostemata, Myxophaga, Adephaga, Polyphaga: Staphyliniformia
Arnett, R.H., Jr., and M. C. Thomas. (eds.). 2000. CRC Press LLC, Boca Raton, FL.