TWO NEW FOSSIL HAWKS FROM NEBRASKA WETMORE 75 



pared with tlie others, place it in the subfamily Aegypiinae, adding 

 another species to this gi'oup in the New World. It has the strong, 

 robust form of Neogyps errans^ but in detail of structure it is more 

 similar to the more slightly built Neophrontops americanus. 



From Neophrontops americanus, in addition to its much larger 

 size, P. howardae differs in having the larger and more robust middle 

 trochlea projecting abruptly on the anterior face, instead of merging 

 gradually into the shaft; the external intertrochlear sulcus much 

 wider ; the axis of the ala interna of second trochlea making a right 

 angle with axis of shaft, so that its point is elevated above lower 

 margin of trochlea instead of nearly on the same level ; the inferior 

 foramen less elevated ; and a strongly impressed tendinal groove on 

 posterior face ®f outer margin of shaft. 



Neophrontops dakotemis Compton -, described from the lower 

 Pliocene of South Dakota, is decidely smaller. 



Palaeohorus howardae agrees so closely with P. umhrosus, which 

 Dr. Hildegarde Howard ^ has included in the subfamily Aegypiinae, 

 that after some consideration, including a careful study of Cope's 

 figures, it is described in the genus Palaeobom^^. I have not been 

 successful in locating Cope's type material, but should this subse- 

 quently be found comparison of the actual specimens may indicate 

 that the species here named should be placed in a separate genus. 



I have pleasure in naming this species for Dr. Hildegarde Howard 

 in recognition of her excellent work on the eagles and eaglelike 

 vultures of the Pleistocene deposits of California. 



Family FALCONIDAE 

 Genus FALCO Linnaeus 



FALCO RAMENTA, new species 



Characters.— Distsil end of tarso-metatarsus (fig. 14) generally 

 similar to modern Falco colmnharms Linnaeus* but decidedly 

 smaller; inferior foramen viewed from posterior surface more 

 elevated on shaft. 



Description.— Ty^e, U.S.N.M. no. 13898, distal portion of right 

 metatarsus, from Miocene of Merijchippus quarry, in southwest corner 

 of NW14, sec. 14, T. 31, R. 47, Dawes County, Nebr., collected in 

 1934 by Ted Galusha. Shaft slender but strong; anterior face with 

 a faintly impressed, very shallow groove toward inner margin that 

 disappears completely well above trochlea, the surface becoming 

 smoothly curved at that point; opening for anterior foramen very 



* Amer. Journ. Sci., vol. 30, Oct. 1935, p. 344, fig. 1. 



« Carnegie Inst. Washington Publ. 429, Oct. 1932, p. 70 et seq. 



*Systcma naturae, ed. 10, vol. 1, 1758, p. 90 (South Carolina). 



