This site has soome good links to several different insect groups, The Butterflies of North Dakota is updated by Dr. Ron Royer who has a book out of the same name...you can contact me at firstname.lastname@example.org if you would like more info about the butterfly book.
University of California Riverside -- Entomology Museum
Good FAQs on Southern California insects and spiders, including info on brown recluse and africanized honeybee occurence in California, and general info on other Southern California bugs people often ask about.
Disclaimer: Dedicated naturalists volunteer their time and resources here to provide this service. We strive to provide accurate information, but we are mostly just amateurs attempting to make sense of a diverse natural world. If you need expert professional advice, contact your local extension office.