This Web site from Penn State University is a vast resource of information on aquatic insects. Users can search or browse the database for an insect species and view maps of the selected species distribution within Pennsylvania, or all of North America. The site has recently added some radar images of a Mayfly emergence, complete with a detailed description to help interpret the images. Those visitors interested in trout fishing may appreciate the two pages on tying flies that can be found by navigating through the section entitled How to Use Site.
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