with Descriptions of New Genera and Species. Ill 



Cope, E. D. — 1884. — B. On the structure of the feet in the extinct Artio- 

 dactyla of North America, Pal. Bull. 39. 



— 1884.— C. The history of the Oreodontidse. Amer. Nat., 18, 280- 



282. 



— • 1888-1889.— The Artiodactyla. Ibid., 22, 1079-1095; 23, 111-136. 

 Leidy, J. — 1856. — Notice of some remains of extinct vertebrated animals. 



Proc. Acad. Nat. Sci., PhUa., 8, 163-165. 



— 1873. — Contributions to the extinct vertebrate fauna of the western 



Territories. Kept. U. S. Geol. Surv. Terr., 1, 14-358. 

 Loomis, F. B. — 1920. — On Ticholeptus rusticus and the genera of Oreodon- 



tidse. This Journal (4), 50, 281-292. 

 Marsh, O. C. — 1873. — Notice of new Tertiary mammals. Ibid. (3), 5, 407- 

 410. 



— 1875. — Notice of new Tertiary mammals. Ibid. (3), 9, 239-250. 



— 1884. — Dinocerata. U. S. Geol. Surv., Mon. 10. 



Matthew, W. D. — 1899. — A provisional classification of the fresh-Avater Ter- 

 tiary of the West. Bull. Amer. Mus. Nat. Hist., vol. 12, 19-75. 



— 1909. — Faunal lists of the Tertiary Mammalia of the West. In Bull. 



361, U. S. Geol. Surv., 91-120. 

 Merriam, J. C, and Sinclair, W. J. — 1907. — Tertiary faunas of the John 



Day region. Bull. Univ. California, vol. 5, 171-205. 

 Scott. W. B. — 1890. — Beitrage zur Kenntniss der Oreodontidae. Morpholog. 



Jahrb., 16, 319-395. 



Art. VIII. — Two New Forms of Agrioclioerus; by Mal- 

 colm Rutherford Thorpe. 



[Contributions from the Othniel Charles Marsh Publication Fund, Pea- 

 body Museum, Yale University, New Haven, Conn.] 



Table of Contents. 

 Introduction. 

 White Kiver (Great Plains) species. 



A. antiquus antiquus Leidy. 



A. antiques ddkotensis, subsp. nov. 



A. migrans (Marsh). 

 John Day Basin species. 



A. 'bullatus, sp. nov. 

 Synoptic table of species. 

 References. 



Introduction. 



The genus Agriochoerus has approximately as many 

 synonyms as have the Chalicotheres. In 1850, Leidy 

 described the first form as A. antiquus from the badlands 

 of Nebraska. Other genera proposed since that time 

 and now regarded as synonymous are : Eucrotaphus 

 Leidy 1852, Coloreodon Cope 1879, Merycopater Cope 

 1879, Artionyx Osborn and Wortman 1893, and Agrio- 

 meryx Marsh 1894. 



