The entomology division of UNL Extension has created an online resource featuring insect pests. The "Entomology Insect Library" includes a wide variety of insects organized by pest categories.
The insect pest library is available by clicking "Entomology" at http://contentdm.unl.edu/cdm/collections. The site includes images to aid in identification. Each image is described by the subject's taxonomic information.
The images on the website are available for use in publications. To request an image, send email to entoimagelib@unl.edu.