. Biology of the Heteromyidae. Heteromyidae. THE FOSSIL RECORD 17 basal inflation occurs only in the upper pre- molar. The upper incisor is asulcate; the lower is much deeper than wide and has a rounded anterior face. Deciduous premolars have been described and figured by Wood (1935a), Wilson (1939), Lindsay (1972), and Whistler (1984). Korth (1979^) described a large sample of Cupidinimus nebraskensis from the Crookston Bridge Member of the Valentine Formation (not at the locality of the holo- type). He observed variation in the upper and lower premolars in which accessory cuspules are presen
. Biology of the Heteromyidae. Heteromyidae. THE FOSSIL RECORD 17 basal inflation occurs only in the upper pre- molar. The upper incisor is asulcate; the lower is much deeper than wide and has a rounded anterior face. Deciduous premolars have been described and figured by Wood (1935a), Wilson (1939), Lindsay (1972), and Whistler (1984). Korth (1979^) described a large sample of Cupidinimus nebraskensis from the Crookston Bridge Member of the Valentine Formation (not at the locality of the holo- type). He observed variation in the upper and lower premolars in which accessory cuspules are present in a notable percent of the sample. He pointed out that the cheek teeth of C. nebraskensis are not low crowned (Wood, 1935^:118: "teeth medium to low crowned") but are equal or nearly equal in crown height to that of species of Perog- nathoides. Korth synonymized Cupidini- mus and Perognathoides and suggested that Cupidinimus be selected as the generic name. Perognathoides has only page priority, and the dentition of the type specimen is so worn as to be generically indeterminate. Lindsay (1972) had noted the great similarity o{Pe- rognathoides halli and Cupidinimus ne- braskensis and suggested that they might be congeneric. Whistler (1984) and Bamosky (1986«) followed Korth in the synonymy. Korth referred Perognathus saskatchewan- ensis Storer, 1970, to the genus; he pointed out special features of Lindsay's Barstovian sample of C. nebraskensis that make these specimens a new species of the genus, and Bamosky (\9S6a) created the species C lindsayi to receive them. As mentioned above, Cupidinimus magnus was formally transferred to the geomyid genus Pliosac- comys by Shotwell (1967). A still larger specimen attributed to Cupidinimus (Chaf- fee, 1936) might belong there also. Bamosky (1986a) named new species of Cupidinimus and carefully reexamined the existing taxa. He identified two major clus- ters of species that are divided by the Rocky Mountains. He found evide
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