In fitting with the presentation-by-topic style, Lehane eases the presentation by discussing the groups of insects by behavioral methodology, including temporary ectoparasites, such as tabanids, mosquitoes and blood-feeding bugs, permanent ectoparasites, such as lice and the sheep ked; and periodic ectoparasites, such as many of the fleas and the
Pupipara. This approach has benefits and drawbacks; however, this style fits well into the overall presentation.