Abstract

Two new species of Mastogenius Solier, 1849, are described and illustrated: M. arizonicus from the Santa Catalina Mountains, Pima Co., Arizona and M. texanus from Brewster and Davis counties, Texas. Extensions to the range of M. puncticollis Schaeffer and M. robustus Schaeffer are given. A key to the haplostethine genera, and a key to and a catalogue of the species of Mastogenius of North America, including Mexico, are given.

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