478 
Ischyromys, Sciuromys, Mysops, Apatemys, Dipodomys. 
741. f Ischyromys, Leidy, 1856. 
Colotaxis, Cope, 1873; Gymnoptychus, p., Cope, 1873 (nec 1874). 
Leidy, Proc. Aead. Pliilad., 1856, p. 89. 
4837. f typus, Leidy — ( 2545 ); Matthew, 1. c., fOligocaen. 
1899, p. 52; Tullberg, Nagethiere, 1899, Dakota Merid., 
p. 463. Nebraska, Colorado. 
4838. f veterior, Matthew, Bull. Amer. Mus., fOligocaen. infer. 
1903, p. 211. Montana. 
742. f Sciuromys, Schlosser, 1884. 
Scklosser, Palseontogr., 1884, p. 82. 
4839. f cayiuxi, Schlosser — (2546). fOligocaen. Gallia 
Merid. 
743. f Mysops, Leidy, 1871. 
Syllophodus, Cope, 1883. 
4840. f minimus, Leidy — (2547); Matthew, fEocaen. Wyomiug. 
Bull. Amer. Mus., 1899, p. 39. 
4841. f fraternus, Leidy — (2548); Matthew, fEocaen. Wyoming. 
1. c., 1899, p. 39. 
Incertae Sedis. 
744. f Apatemys, Marsh, 1872. 
Marsh, Amer. Journ. Soc., 1872, IV, p. 221. 
4842. f bellus. Marsh — (4119); Matthew, Bull. fEocaen. Wyoming. 
Amer. Mus., 1899, p. 39. 
4843. f bellulus. Marsh — (4120); Matthew, fEocaen. Wyoming. 
1. c., 1899, p. 39. 
Familia XTI. Heteromyidae. 
Subfam. 1 . Dipodomyinae. 
745. Dipodomys, Gray, 1841. 
Macrocolus, Wagner, 1846; Dipodops, Mendam, 1890. 
Gray, Ann. Natur. Hist., 1841, VII. p. 521. 
4844. phillipsi. Gray — (3504); (nec True, Mexieo (Eeal dei 
1884 — 85); Miller et Rehn, Proc. Bost. Monte), Vallo Mexieo. 
Sc., 1901, p. 152. usque ad Guanajuato. 
hakicus, Wagner. » 
