xv, i Shufeldt: The Monkey -eating Eagle 45 



The harpy eagle possesses coracoids very similar to those of 

 Pithecophaga, while in the American white-headed species the 

 head of the coracoid is much compressed from side to side. 



In agreement with the other bones of its pectoral arch, Pithe- 

 cophaga possesses a scapula of great size and unusual strength. 

 As in the case of the coracoid and the furculum, it is highly 

 pneumatic, the foramina for the admission of air into its interior 

 being found on the ventral aspect close to the head of the bone. 

 The head is broad from side to side and somewhat compressed 

 from above downward; at its outer angle there is an elliptical 

 articular surface that constitutes about one-third of the glenoid 

 cavity, while at the mesial angle a big quadrilateral process pro- 

 jects forward for the attachment of the coracoscapular ligament. 

 The neck of the bone is broad and thick ; the borders are rounded 

 off/ This part constitutes about one-third of the blade; pos- 

 terior to it we have the curved scimitarlike blade of the bone. 

 This is carried backward to a blunt point, the outer border 

 being rounded, and the mesial one having a thickened edge ; the 

 latter commences abruptly near the middle point of the bone as 

 a whole. From head to apex this scapula presents a uniform 

 and gentle curvature in the plane of the bone's blade, the con- 

 cavity of the curve being along the outer border. 



The harpy eagle has the distal moiety of a scapula very broad, 

 with the outer margin sharp, but the inner one rimmed pretty 

 much as we find it in the monkey-eating species. In the golden 

 eagle the terminal part of the blade is distinctly truncated, and 

 the entire bone is much compressed from above downward. 

 This is also true of the scapula in our white-headed bird; here 

 the blade is extremely narrow and is drawn out posteriorly to 

 a truncated apex. In this species it does not seem to be espe- 

 cially pneumatic. The Korean eagle has a scapula resembling 

 that bone in the golden eagle. 



These birds — Pithecophaga forms no exception to the rule — 

 possess a big sternum of extraordinary capacity. Ventrally it is 

 one deep basin from side to side as well as lengthwise. Down 

 the middle line there is a row of scattered foraminal openings 

 to admit air during the life of the individual. Its xiphoidal 

 border is at right angles to the long axis of the bone and presents 

 but a shallow concavity for its middle third. Well within this 

 border, upon either hand, there is an elliptical foramen of no 

 great size. Seven facets occur upon each costal border, with a 

 great many pneumatic foraminal openings among them. Their 

 interarticular cavities are very shallow. On the outer aspect of 



