The most comprehensive and most affordable insect biology textbook available. The third edition focuses more on biological principles, highlights the relevance of the subject to students' everyday lives, introduces the latest scientific research, and includes numerous new and/or thoroughly updated insect identification keys. James Whitfield, of the University of Illinois, Urbana-Champaign, joins the author team, bringing a wealth of expertise on molecular analysis relating to development and systematics. In keeping with the changing nature of the entomology course, the text has been recrafted with both entomology majors as well as other interested undergraduates in mind. The revised text introduces key themes, such as evolution, applications to the real world, and new pedagogic tools, making the material even more relevant, interesting, and engaging. At the same time, the text maintains all its original strengths as an authoritative source for the latest discoveries from the lab by thoroughly updating key topics and illustrations. The revision's three-pronged approach- updating of core biological principles, adding new and updated identification keys, and making the material more accessible through pedagogical devices- truly makes Daly and Doyen's Introduction to Insect Biology and Diversity the most comprehensive and affordable entomology text available.