Abstract
The genus Cyphoderris, or hump-winged grigs, is represented by three species of cold-adapted, acoustic Ensifera with a geographic distribution that is generally restricted to the high-elevation coniferous forests of western North America. A phylogenetic analysis based on 29 morphological and 3 behavioural characters produced one tree, (C. buckelli (C. strepitans, C. monstrosa)) with a consistency index of 1.0. We discuss possible explanations for the observation that almost all of the autapomorphic change was concentrated in C. monstrosa.
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