This 36-slide presentation introduces students to some of the most common and well-known orders of Insects = Coleoptera, Lepidoptera, Diptera, Hymenoptera, Hemiptera, Odonata, Phasmida, Mantodea, and Orthoptera. It also includes a very simple dichotomous key for differentiating between these orders and gives example of representative species in each order. There isn't a lot of technical jargon in the presentation, making it a lesson that would be accessible to inexperienced students. It includes beautiful creative commons photos which have been properly credited. This will bring the world of insects more alive to students and would work well with as a pre-lab for an insect lab. You can choose if you want your students to know the proper scientific names for the orders; I personally am fine with them just using the common names and understanding the categories (although I do use the proper order names in the slides along with some common names).
Useful to combine with my other product on insect morphology for a complete lesson in entomology: http://www.teacherspayteachers.com/Product/Insect-Morphology-1613757