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Acanthophotopsis snellingi Tanner and Pitts, sp. nov., is described based on males collected from Chihuahua and Fresnillo, Mexico, which raises the number of species of Acanthophotopsis to six. Acanthophotopsis snellingi differs from other species of Acanthophotopsis by having the following unique combination of characters: the head is elongate, with the lateral margin parallel behind the eyes and converging posteriorly; the basal margin of the clypeus lacks a median longitudinal carina and central tubercle; the mandible is tridentate; and the first flagellar segment is 1.5-2X long as wide. We also report that A. falciformis furcisterna is a junior synonym of A. falciformis falciformis. An illustrated key is given for the species of Acanthophotopsis.