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186 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY
Angeles (UCLA); and the George C. Page and Los Angeles
County Museum of Natural History (LACM), California. Other
fossils examined are in the collections of the American Museum
of Natural History (AMNH), New York, and the Oklahoma
Museum of Natural History (OMNH), Norman. Specimens
were measured with digital calipers to the nearest 0.1 mm; all
measurements are self-descriptive except proximal depth of the
coracoid, which was taken from the glenoid facet to the brachial
tuberosity. Comparative material for Amplibuteo hibbardi
Campbell was not available, and character determinations for
skeletal elements are based on the published descriptions and illustrations
in Campbell (1979). Osteological terminology follows
that of Howard (1929), with certain modifications. Nomenclature
for species' binomials and English names of
modern birds follows Sibley and Monroe (1990).
ACKNOWLEDGMENTS.—This research was funded by NSF
Grant EAR 94-03206 to S. Emslie and by M. Mares, Director,
OMNH, with funds to N. Czaplewski in support of field work.
Assistance with museum collections was provided by K.
Campbell and C. Shaw (LACM); D.W. Steadman and T. Webber
(UF); and P. Angle and S. Olson (USNM). G.S. Carr (formerly
UF) and D.W. Steadman originally identified the Inglis
1A avifauna and recognized that an undescribed eagle was represented
in the collection. Field assistance at Inglis 1C was provided
by J. Boyle, Steve and Sue Hutchens, J. Mueller, M. Sewolt,
B. Shockey, Barbara and Reed Toomey, and T. Verry. M.
Frank and B. MacFadden, UF, also provided support for the
excavation of this site, and we thank E.H. Lindsay, Cheryl D.
Czaplewski, and Lynn Saline (United States Bureau of Land
Management) for their assistance to N. Czaplewski. We thank
G. Morgan, S. Olson, S. Parry, and D.W. Steadman for their
comments on an earlier version of this paper.
AVES
ACCIPITRIDAE
Amplibuteo Campbell, 1979
Genus characterized by having the carpometacarpus with
metacarpal III merging with the distal symphysis at an angle, a
tendinal groove that curves proximally to the anterior surface
of metacarpal II, the humerus with the shaft relatively straight
and excavated at the distal end of the median crest, a broad
pneumatic foramen, a deep excavation on the internal side of
the impression for M. brachialis anticus, and a prominent deltoid
crest as described for Morphnus (Howard, 1932). Includes
two species, A. woodwardi and A. hibbardi, formerly referred
to Morphnus (see Campbell, 1979); A. concordatus, new species;
and one undescribed species.
Amplibuteo concordatus, new species
HOLOTYPE.—Right carpometacarpus, UF 159426 (Figure
1A; Table 1).
TYPE LOCALITY.—Haile 7C, section 24, T. 9S, R. 17E, Alachua
County, Florida (FLMNH Vertebrate Paleontology Locality
number AL109; Figure 2).
FIGURE 1.—A, Holotypical right carpometacarpus
(UF 159426) of Amplibuteo concordatus from Haile
7C, Alachua County, Florida, in internal (left) and
external (right) views; B, paratypical left carpometacarpus
(AMNH 10395) from Duncan 4-19,
Greenlee County, Arizona, in internal (left) and
external (right) views. For each specimen,
scale = xl, bar= 1 cm.