46 Philippine Journal of Science ww 



the body of this sternum, at the anterosuperior angle and in- 

 cluding the distance occupied by the first four hsemapophysial 

 articular facets, there is a marked concavity which is the con- 

 tinuation of the costal groove of the same side. Its lower bound- 

 ary is curved, with the convexity toward the keel (Plate IV). 

 The keel is not deep by any means and is continued only two- 

 thirds the length of the body, its lower border being uniformly 

 convex. Anteriorly, the carinal angle is rounded off, the con- 

 cave, anterior border above it being sharp for its lower half 

 and flat for its upper, terminating superiorly in a stumpy 

 manubrium, which is truncated anteriorly, leaving, as it were, 

 a small, triangular surface, with the angle below in the middle 

 line. The deep coracoidal grooves are remarkably well defined 

 in front, in the middle line, at which point they decussate to 

 some extent. 



The external surface of the sternal body, upon either side of 

 the carina, is smooth, and the line of the pectoral muscle is but 

 faintly defined. Occasionally we find in the body of the sternum 

 of this and other eagles one or two small, sporadic foraminal 

 openings, just as though a bird shot had made a perforation and 

 the wound subsequently healed. I find a rather large, nearly cir- 

 cular one of these in the sternum of the harpy eagle, it being 

 situated on the right side of the body of the bone, near its middle. 

 In this species the sternum is somewhat smaller than the one just 

 described; but, ventrally, it presents the same profound con- 

 cavity, with fewer evidences of pneumaticity, however. The xi- 

 phoidal elliptical foramina, one upon either side, are very much 

 larger; and this extremity of the bone has an increased width 

 due to the lateral extension of the xiphoidal portion, which is 

 well seen upon lateral view (Plate V) . There is the same num- 

 ber of articular facets upon either costal border as we described 

 for Pithecophaga jefferyi — indeed, all eagles seem to have the 

 same number. The Korean eagle lacks any foraminal openings 

 in the xiphoidal end of the bone, and the sharp border there is 

 entirely lacking in notches, being wholly at right angles to the 

 carina, which fails to run out to it by at least 2 centimeters. 

 Within the thoracic cavity of the body of the bone foraminal per- 

 forations occur not only down the middle line of the bone to a 

 point opposite the last pair of facets on the costal borders, but 

 likewise in a great area in front and along both sides to a similar 

 point. The coracoidal grooves decussate in this eagle, as they 

 do in the white-headed species, and they are invariably of some 

 considerable depth. In the latter bird there is also an absence 



