The members of the order Coleoptera can be distinguished readily from all other insects, except the earwigs, by the horny, veinless wing-covers which meet in a straight line down the back, beneath which there is a simple pair of membraneous wings. Beetles differ from earwigs mainly in not having the pincer-like appendages at the tail-end of the body, characteristic of the earwigs.
Proceedings of the Iowa Academy of Science
©1914 Iowa Academy of Science, Inc.
King, Inez N.
"The Coleoptera of Henry County, Iowa,"
Proceedings of the Iowa Academy of Science, 21(1), 317-340.
Available at: https://scholarworks.uni.edu/pias/vol21/iss1/43