NO. 20 I'LIOCENI-: BIRD REMAINS WETMORE Q 



above the river, and another similar fragment (U.S.N. M. no. 12826) 

 obtained by Welles 3 miles south of the main quarry opposite Two- 

 mile Rapids on Snake River are also similar in size to this species. 



CYGNUS sp. 



Remains of a sw^an about as large as the modern trumpeter swan. 

 Cygnus hnccinafor, are fairly abundant in the collection here under 

 discussion but are all in such fragmentary condition as to make an 

 attem])t at specific identification inadvisable. 



A small section of the lower end of the shaft of a right humerus 

 (U.S.N.M. no. 12234) was collected in June 1930 from the main 

 Plesippus quarry, being one of the few bird bones obtained from that 

 excavation. This bone dififers from the humeri of modern swans ex- 

 amined in having the brachial depression located nearer the external 

 margin. 



The locality 200 feet above Snake River, from which the smaller 

 swan was obtained, produced also the proximal ends of two scapulae 

 (U.S.N.IM. no. 12243) of ^ larger species that should be mentioned 

 here. They are about the same in size as the trumpeter. 



From another locality designated as Canyon 9, located 5^ miles 

 south of the main Plesippus quarry, at the same level as that deposit, 

 there were obtained the proximal ends of two metacarpals more or 

 less fragmentary and worn (U.S.N.M. no. 12236). One of these is 

 slightly larger than the other, the difiference probably being individual. 

 A specimen (U.S.N.M. no. 12824) identical with these was collected 

 in a locality indicated as Canyon 8, 5 miles south of the main quarry 

 at an elevation of 200 feet above the river. 



CHEN PRESSA sp. nov. 



Characters. — Femur (figs. 5-8) similar in form to that of Chen 

 Jiyperhorca (Pallas) ' but smaller; neck shorter, so that the space 

 between the trochanter and the head is decidedly reduced. 



Type. — U.S.N.M. no. 12823, left femur, collected in February 1931 

 by Elmer Cook from Upper Pliocene deposits of the Hagerman Lake 

 beds I luile south of Plesippus quarry and 350 feet above level of 

 Snake River, near Hagerman, Idaho. 



Description. — Head with upper free surface hemispherical (outer 

 surface somewhat broken), indented slightly for the attachment of the 

 round ligament, lower free margin undercut ; iliac facet broad and 

 nearly plane; trochanter prominent (partly broken away), approach- 



' Anscr hypcrboreus Pallas, Spic. Zool., vol. i, fasc. 6, 1769, p. 25. 



