The tympanic process of the alisphenoid bone of the skull is short, not covering the cavity of the tympanum, nor reaching the paroccipital process. [Please select]
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A heavy dermal fold from posterior corner of eye above tympanic region and then to insertion of forearm; tympanum completely concealed. [Please select]
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The specimen from Mattomi seems to be unique in the large size of the tympanic bullae. [Please select]
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Skull small; tympanic bullae small; rostrum wide; skull indistinguishable from that of _P. [Please select]
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From _Perognathus merriami gilvus_, of more southern distribution, the new subspecies differs in much smaller tympanic bullae and wider rostrum. [Please select]
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Tympanic bulla smaller than foramen magnum; hind foot more than 74; geographic range wholly in United States. [Please select]
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