Damselfly Genera of the New World, an Illustrated and Annotated Key to the Zygoptera Garrison, R. W. , Von Ellenrieder, N. , and Louton, J. A. 2010. Damselfly Genera of the New World, an Illustrated and Annotated Key to the Zygoptera. The Johns Hopkins University Press, 490 pp., 2586 figs., 108 maps. ISBN 978-0-8018-9670-5. Hardback, $84.37 (amazon.com).