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1 January 2011 European Earwig, Forficula auricularia L. (Dermaptera: Forficulidae), at the Hanford Reach National Monument, Washington State
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Abstract

The European earwig, Forficula auricularia L., was surveyed using pitfall traps at 3 sites at the Hanford Reach National Monument in south central Washington State. Pitfall traps were collected weekly from April 2002 through April 2003. The earwig was consistently taken during all months of the year at a disturbed, weedy site along the Columbia River (White Bluffs Ferry site) but was rare or not collected in 2 less-disturbed shrubsteppe habitats. Highest numbers occurred during April–May, when immatures accounted for the majority of the catch; immatures reached the adult stage during mid-July, and the species is univoltine at the site. Possible reasons why earwigs have not colonized the monument's shrubsteppe habitat include the arid climate with lack of available moisture, especially for breeding purposes, and a lack of burrow sites.

© 2010
Richard S. Zack, Dennis Strenge, Peter J. Landolt, and Chris Looney "European Earwig, Forficula auricularia L. (Dermaptera: Forficulidae), at the Hanford Reach National Monument, Washington State," Western North American Naturalist 70(4), 441-445, (1 January 2011). https://doi.org/10.3398/064.070.0403
Received: 9 June 2009; Accepted: 1 April 2010; Published: 1 January 2011
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