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NEW YORK STATE MUSEUM 



obliterated. The distance between the superorbital margins is very- 

 narrow, and a shallow, longitudinal, median groove courses between 

 them, nearly as far in a backward direction as the supraoccipital 

 prominence. The parietal prominences are smooth and somewhat 



Fig. 20 



Fig. 21 



Fig. 19 Left lateral view of the skull and mandible of Circus hudsonius 

 Fig. 20 The same specimen from above; mandible removed 

 Fig. 21 The same seen from below; mandible removed 



Fig. 22 The hyoid arches from below. All these figures are life size from nature, 

 from an adult female subject collected by the author in Wyoming (1878). 



prominent. Venous grooves are seen running over them and lead- 

 ing to minute foramina just within the orbital margins. 



The superciliary processes of the lacrymals are well seen upon 

 this view, and it is to be noticed that their outer extremities support 



