Almost nothing is known of P. caniceps (Avise et al., 1974; Hooper, 1968). According to Burt (1932), it is similar in some respects and undoubtedly belongs to the same group as P.pseudocrinitus; however, P. caniceps appears to be a distinct species. It differs radically in coloration from P. pseudocrinitus, and the skull is distinct with zygomatic processes of the squamosalprojecting laterally beyond the border of the braincase and tapering nasals, and differs in relative length of the shelf of the bony palate and the maxillary tooth row. Averagemeasurements (in rom) of sixteen adults (Burt, 1932) are as follows: total length, 202; length of tail, 112; length of hind foot, 22; length of ear from notch, 15.5; greatest length of skull, 25.7; condylobasallength, 22.9; basilar length of Hensel, 19.5; zygomatic breadth, 13.2; least interorbital constriction, 4.0; length and width of interparietal, 9.3 by 4.0; length of nasals, 9.4; length of shelf of bony palate, 4.0; and length of maxillary tooth row, 3.8.