SUPPLEMENTARY NOTE TO THE MONOGRAPH OF THE 



LEPORIDiE. 



EXTINCT AMERICAN HARES.* 



Some half dozen species of extinct Ilarcs liave been described, mainly 

 from (lie Miocene deposits of Dakota and Colorado. As they arc at present 

 known merely frotn a few jaw-fragmciits and detached teeth, little more can 

 be said of them than that they were animals oF rather small size, and belonged 

 to the family of the Hares. Tlieir true character and relationships can, of 

 course, be understood only by the study of much additional materiaL 



Genus PAL^OLAGUS Lcidy. 



ra;«»;ojM» Leujv, Proc Acad. Nat. Sci. Pbila., 185C, 89.— Co^E, Aun. Hep. U. S. Oeol. Sun-. Terr, for 



1873(1874), 477. 

 rricium Cope, PaUeontol. Bull. No. 16, 1873, 4. 



Dr. Leidy has described a single species from the Miocene deposits of 



Dakota, and Professor Cope has made known allied forms from deposits of 



tlic same age in Colorado. Our knowledge of tliese forms rests on fragments 



of the jaws, and is hence very imperfect The dental formula is the same 



as in Lepus, but the molar teeth differ somewhat iu constitution. A single 



species of this genus has been described by Dr. Leidy, and three others by 



Professor Co[x;. 



PAL^OLAGUS HAYDENI Leidy. 



raleeotajui hagdeni Lridv, Proc. Aca<1. Nm '<cl. Pliila., 1854!, 89{ 18.57, 89 ; Juurn. Acad. Nat. 8cl. Pkila., 

 2d Hcr., V, 1869, 331, 404, pi. xxvi, figs. 14-20; U. S. Ocol. Survey of Wiouiiuf;, 1H71, :)63.— 

 Coj-K, Ann. Hop. U. 8. Ocol. Survey of Terr, for 1873 (1874), 478. 



Ti icJHm aiivncufiM Cui'K, Palwoulol. Diill. No. 10, 1873, 4. 



" Triciiim antm CoTE " (soo Auu. Rep. U. 8. Cieul. Surs-ey of Terr, for 1673 (1874), 478). 



This species is known only from a considerable number of fragments of 

 upper and lower jaws with teeth, collected by Dr. Hayden from the Miocene 



'Having decided, since the foregoing pages vrcro put in type, to Include in these monographs notices 

 111 the extinct speeies, as well as of tlie existing ones, this supplementary note is adde<l to the Mouu- 

 {!r»ph of the Leptnia, 



87J 



