Pappogeomys castanops (Baird, 1852) . In Stansbury, Expl. Surv. Valley Great Salt Lake, Utah, App. C(Zool.), p. 313.

TYPE LOCALITY: USA, Colorado, Bent Co., along prairie road to Bent's Fort, near present town of Las Animas .

DISTRIBUTION: SE Colorado and SW Kansas (USA) to C San Luis Potosi (Mexico).

SYNONYMS: angusticeps Nelson and Goldman, bullatus Russell and Baker, clarkii Baird, consitus Nelson and Goldman, elibatus Russell, excelsus Nelson and Goldman, goldmani Merriam, hirtus Nelson and Goldman, jucundus Russell and Baker, lacrimalis Nelson and Goldman, parviceps Russell, perexiguus Russell, peridoneus Nelson and Goldman, perplanus Nelson and Goldman, planifrons Nelson and Goldman, pratensis Russell, rubellus Nelson and Goldman, simulons Russell, sordidulus Russell and Baker, subnubilus Nelson and Goldman, subsimus Nelson and Goldman, surculus Russell, tamaulipensis Nelson and Goldman, torridus, Russell, ustulatus Russell and Baker.

COMMENTS: Subgenus Cratogeomys . Russell (1968b) delineated two subspecies groups, which are karyotypically distinct and may represent separate species (see Berry and Baker, 1972, and Lee and Baker, 1987). Reviewed by Davidow-Henry et al. (1989, Mammalian Species, 338, as Cratogeomys castanops); subspecies in the US were revised by Hollander (1990).