154 Proceedings of the Biological Society of Washington. 



widely outstanding and less angular ; squamosal arm less expanded ver- 

 tically; palate and postpalatal shelf broader and flatter; sagittal crest 

 shorter and less highly developed; inion shorter. Teeth somewhat 

 larger. 



Skull measurements ( c? ad. type).— Basal length 310 mm.; occipito- 

 nasal length 305; palatal length 170 ; zygomatic breadth 217 ; interorbital 

 breadth 76. 



