The Collembola or "Spring-tails" comprise a very interesting order of wingless insects, usually associated with the order Thysanura, and frequently placed in that order. These little insects are common under bark and stones and among loose debris, wherever they can find dark, moist hiding places. As they range from less than 1 to only about 4 millimeters in length, and are usually very agile, we seldom notice them when collecting unless we are looking especially for them.
Proceedings of the Iowa Academy of Science
©1903 Iowa Academy of Science, Inc.
Guthrie, J. E.
"The Furcula in the Collembola,"
Proceedings of the Iowa Academy of Science, 11(1), 69-73.
Available at: https://scholarworks.uni.edu/pias/vol11/iss1/10