To find pictures of insects go online to www.insectimages.org, Developed by Bugwood Network and the USDA Forest Service, this free database can be browsed by category of insect or keyword searched.
Once a mystery insect has been identified go to Plant Disease and Insect Identification Pests Leaflet Series from WSU for information on insects commonly found in western Washington or Insect and Pest Series Index from Ohio State University for general garden pest fact-sheets.