Abstract
The chrysobothrine genus Knowltonia Fisher is resurrected and discussed in connection with the closely related genera Chrysobothris Eschscholtz and Sphaerobothris Semenov-Tian-Shanskij & Richter. Knowltonia is reviewed, with K. calida (Knull) being elevated to a full species and a key to described species is given. Chrysobothris socialis Waterhouse is recognized as polytypic, with C. socialis apache Westcott and Barr, new subspecies, described from Arizona and northern Mexico. Acmaeodera audreyae Westcott and Barr, new species, is described from southern California and is related to A. inopinata Barr.
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