I30 NEW YORK STATE MUSEUM 



As in Milvinae, Circinae, and Accipitrinae, the scapular process of a 

 coracoid not produced, and never reaches to the clavicle. Manu- 

 brium of sternum small; and the posterior margin of the xipho- 

 sternum extended more or less beyond the termination of the keel 

 behind. Dorsal vertebrae never fuse to form a single bone. In the 

 pelvis the internal margins of the ilia, more or less approximated 

 over the sacral crista ; postpubic style always interrupted ; post- 

 acetabular portion of the bone more or less bent downward and 

 forward. Skeleton of the limbs much as in Circinae. 



4 Falconinae. Skulls broad and somewhat vertically compressed. 

 Tomia of superior osseous mandible toothed just posterior to the 

 apex. Narial aperture (or nostril) circular, small and the ossified 

 alinasal turbinal seen just within it. Supraorbital process of a 

 lacrymal long, and without accessory piece ; its descending limb 

 fuses with the outer border of the pars plana. Superorhinal portion 

 of a maxillopalatine not spongy,, but a firm lamelliform scroll. A 

 median ridge occupies the under side of the upper osseous beak 

 extending from the apex backward to the fused maxillopalatines. 

 Basipterygoid processes absent. Side of lower jaw usually pierced 

 by the ramal vacuity. Last cervical vertebrae and the four leading 

 dorsals fused together to form one solid bone. Os furcula without 

 hypocleidium. Scapular process of the coracoid curves outward 

 and upward and may reach the head of the bone to fuse there. 

 The clavicle of the same side rests upon this bony span when the 

 elements of this girdle are articulated in situ. A mesial lip of bone 

 on anterior border of .sternum to hold coracoids in place when latter 

 are articulated. In the pelvic limb, the median process of the hypo- 

 tarsus of the tarsometatarsus extends as a crest down the shaft of 

 the bone ; while in front this bone is longitudinally grooved for its 

 proximal half, and the tubercle for the insertion of the tendon of 

 the tibialis anticus muscle is to the inner side of this groove, it being 

 to the outer side in the Buteoninae. Basal joints of the second and 

 fourth digits of pes abbreviated, but the prebasal one of the third 

 toe not especially so. 



5 Polyborinae. Vulturine falcons with deep and somewhat elon- 

 gated skulls, of which the facial part is large and inclined to be 

 massive. Opening of nostril small and reniform in outline, and 

 through it may be seen the ossified alinasal turbinal. Edges of 

 osseous upper beak not toothed. Keel to premaxillary in the middle 

 line of the roof of the mouth, prominent. Septum narium com- 

 plete. Maxillopalatines within the rhinal chamber, large, tuberous 



