2 literature references for Alpha crenulata (Bruner, L., 1889):

Author: Scudder, S.H. & Cockerell
Year: 1902
Title: A first list of the Orthoptera of New Mexico
Source: Proceedings of the Davenport Academy of Natural Sciences (Proc. Davenport Acad. Nat. Sci.) 9:1-60
Author: McNeill
Year: 1897
Title: Revision of the Truxalinae of North America
Source: Proceedings of the Davenport Academy of Natural Sciences (Proc. Davenport Acad. Nat. Sci.) 6:179-274