General
- Coleoptera-atlas.com [amazing pictures of select groups of beetles]
- Insect Identification Org [comprehensive guide to common North American insects]
- The Insect and Spider Collections of the World Website
- The Outdoor Enthusiast's Guide to Bugs
- BugGuide [Identification, images, & information for insects, spiders & their kins for the United States & Canada]
Diversity and systematics
North America north of Mexico
North America (US & Canada) California
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Coleoptera (Beetles)
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Images
- Insectimages.org (>200,000 images from >2000 photographers)
- Psyllids - by Diana M. Percy