428 G. 1. Adams — Extinct Felidce of North America. 



H. primsevus. D. felina. 



Length of humerus .._ 160 172 



ulna _ 163 



radius _ 122 



femur. __ 185 190 



tibia 143 168 



calcaneum 43 43 



metatarsal IV 37 53 



metacarpal IV 38 



The Iloplophoneus Series. 

 Hoplophoneus primcevus Leidy and Owen. 



This species was the first Machserodont found in North America 

 and was described as Machcerodus primcevus and later as Dre- 

 panodon primcevus. The establishment of the genus Hoplo- 

 phoneus Cope, removed it to that group. In Leidy's description 

 in the Ancient Fauna of Dakota and Nebraska a skull is referred 

 to this species which is considerably larger than the original type 

 and quite different from it. The species as here used is as limited 

 by the writer in the American Naturalist, January, 1896. The 

 description of the osteology preceding this makes lurther men- 

 tion of it here unnecessary. Dental formula IjC^-Pmf M^. 



Hoplophoneus robustus Adams. 



This species was proposed as representative of the larger skull, 

 which was referred by Leidy to H. primcevus. As compared 

 with that species, it shows an increase in size and the skeleton is 

 more massive. The skull is relatively large and the first superior 

 premolar (pm 2 ) more reduced and in old specimens may be absent. 

 To this species ""should be referred the specimen determined by 

 Osborn and Wortman as H. primcevus (Bull. Amer. Mus., 1894, 

 p. 228). The figure of the skull and the measurements here 

 given are from that specimen. If C^-Pm^^-Mi. 



Length of skull, condyles to premaxillary border, 180 mm 



" humerus 170 



" ulna 163 



" femun 195 



" tibia _ 160 



Hoplophoneus occidentalis Leidy. 



This is the largest species of the series. It was first proposed 

 by Leidy on a fragment of a mandible (Extinct Fauna of Dakota 

 and Nebraska). It is best known from a fine skull and nearly 

 complete skeleton described by Williston (Kansas University 

 Quarterly, June, '95), as Dinotomius atrox, which name, as has 

 been shown by the writer, is a synonym (Amer. Nat., January, 

 '96). The dentition is IfCfPmf M|. The inferior sectorial is 

 very strong and thick at the base, the postero-internal cusp is 

 wanting and the heel is reduced. 



