0. C. Marsh—New Tertiary Birds. 257 
“ae anterior border. The species was about as large as a 
et ibis. 
Measurements. 
Antero-posterior diameter of outer condyle at distal end of 
101 pet Cops es. we Usk pec ie wae See eee ae oe 9: mms 
Transverse diameter in front, ...-..------ «+--+ -s++- 3 
Vertical diameter in by cu snnes os dame iomarekar eins 
Width of trochlear groove on posterior face of tibia, ----- 5 
The specimens on which this species is based were found by 
the writer, last autumn, near Henry’s Fork, Wyoming. The 
geological position of this locality is essentially the same as 
that at Grizzly Buttes. ‘ 
Aletornis venustus, sp. Nov. 
e m 
Rost entirely inside the central line. The opening below the 
bridge is a broad transverse oval, and looks forward, down- 
Ward, and slightly inward. The tendinal canal is broad, and 
deepest on the inner side: its floor is nearly flat. The outer 
condyle has its margin nearly semi-circular below, and its 
external face regularly concave. The inner condyle has a very 
short antero-posterior diameter. The trochlear groove is deep- 
est near its external margin, where there is a faint narrow 
pnt This specimen indicates a bird about the size of a 
uriew. 
Measurements. 
Transverse diameter of distal end of tibia in front,.- ---- De Ween 
a nsverse diameter below, - ---------------7-77777777 62 
idth of trochlear groove on posterior face, ~---------~ 5° 
tero-posterior diameter of outer condyle,..---- ----- Ss 
Antero-posterior diameter of inner condyle, ------------ . 
Width of supra-tendinal bridge, .-...-------------- 2 28 
Width of opening below bridge, -----------. -------->- 
