13 Left lateral aspect of the skull of Accipiter velox. 

 Adult $ ; natural size ; mandible detached 



14 Left lateral aspect of the skull of Accipiter cooperi. 

 Adult <$; natural size; mandible detached. iSkulls of females of 

 these hawks are larger than those here represented. 



15 Outer aspect of the left pelvic extremity of Accipiter 

 velox. Natural size. From the same individual that furnished 

 the skull in figure 13. Ligamentous preparation, and the bones not 

 altogether in situ 



16 Anconal aspect of the left humerus of Accipiter 

 velox ; natural size, and from the same bird that furnished the 

 pelvic limb shown in figure 15. The small dark area just above the 

 radial crest is a support and does not belong to the Ibone. 



17 Left lateral view of the trunk skeleton of Accipiter 

 velox. Adult $ ; natural size. From a different individual than 

 the one which supplied the skull [fig. 13], pelvic limb, and humerus 

 shown in this plate 



152 



