52 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I44 



beds. Matthew (1915b, pp. 87-88) did not encounter this genus in 

 beds later than Gray Bull, although Loomis reported it from later 

 beds in the Bighorn Basin. The two lower teeth from the New Fork 

 horizon were thought to be of a size appropriate for P. gracilis. They 

 could, nevertheless, be referred with equal conviction to P. ossifraga. 



OXYAENIDAE 

 OXYAENA, sp. 



Further material of Oxyaena in the collections from the La Barge 

 horizon includes a P4 and the anterior part of M2 associated 

 (U.S.N.M. No. 22450). The premolar is as long as in Oxyaena 

 forcipata but both teeth are a little more slender. They are also slightly 

 more rugose than in the type material. Comparison with Oxyaena 

 pardalis is difficult, inasmuch as the critical talonid portion of the 

 molar is not preserved; but size would appear to exclude this Lost 

 Cabin species, as well as Patriofelis (Protopsalis) tigrinus, from con- 

 sideration. 



The earlier (1952) described specimen of Oxyaena, a first lower 

 molar in the Princeton collection (No. 161 76) from near La Barge, 

 was regarded as more nearly comparable in size to Oxyaena lupina. 

 There is no certainty, of course, that the two La Barge specimens 

 represent the same species. So far as the other horizons are concerned, 

 only an isolated lower premolar from the Bitter Creek locality and 

 another from the Dad locality are believed to be Oxyaena. The Bitter 

 Creek tooth corresponds very closely in size and other details to P3 in 

 the type of Oxyaena lupina. In the absence of other evidence, how- 

 ever, recognition of Oxyaen<i lupina in the Bitter Creek fauna would 

 not be warranted. The Dad tooth may be P2 and corresponds well, 

 except for a little greater width, with this tooth in Oxyaena forcipata, 

 the possibility, however, of its representing Patriofelis should not be 

 overlooked. 



AMBLOCTONUS, cf. MAJOR Denison 



To the National Museum materials representing Amhloctonus there 

 have been added an Mi, with the top of the trigonid missing, and an 

 incomplete premolar from the La Barge horizon in the Big Piney 

 area. These may well belong to the same species as that represented 

 by the Princeton jaw (P.U. No. 14720) described in 1952. A lower 

 premolar, probably P3 in the Princeton collection from the Dad lo- 

 cality (P.U. No. 16125) seems also to represent Denison's (1938) 

 Lost Cabin species Ambloctonus major. 



