Oecanthus exclamationis is a "common tree cricket" in the subfamily Oecanthinae ("tree crickets"). A common name for O. exclamationis is Davis' tree cricket. It is found in North America.
References
Further reading
Field Guide To Grasshoppers, Katydids, And Crickets Of The United States, Capinera, Scott, Walker. 2004. Cornell University Press. Otte, Daniel (1994). Crickets (Grylloidea). Orthoptera Species File 1, 120.