4 University of Michigan 



on the side of the head and neck is always present, and in one 

 specimen it is continued on the body as a faint line to the hind 

 limb. 



Remarks: This species recalls P. vertehralis (O'Shaugh- 

 nessy ) and P. ockendeni Boulenger, and it should be pointed 

 out that, whih it can be readily distinguished from these forms 

 by other characters, the character of the nasal shields can in 

 many specimens be det.ermined only by examining this scale 

 with a microscope, since the groove is often deep and appears 

 like a suture. 



