Brief synopsis of North American earwigs, with an appendix on the fossil species
Subtitle: List of the orthoptera collected by A.S. Packard in Colorado and the neighboring territories, during the summer of 1875. Notice of a small collection of butterflies, made by A.S. Packard, in Colorado and Utah, in 1875
Language: eng
Notes: (U.S. Geol. and Geog. Survey of the Territories. Bulletin, 1876, 2. 249-270).