Seven species of Gerridae are known to occur in Oregon and
Washington. These are Gerris (Aquarius) remigis Say, Gerris (Gerris)
buenoi Kirkaldy, Gerris (Gerris) gillettei Lethierry and Severin, Gerris
(Gerris) incognitus Drake and Hottes, Gerris (Gerris) incurvatus Drake
and Hottes, Limnoporus notabilis (Drake and Hottes), and Metrobates
trux infuscatus Usinger....
..................................................................... 3
Key to the Adult Gerridae of Oregon and Washington....................... 11
Subfamily Gerri nae