470 bulletin: museum of comparative zoology. 



Rostral forming an acute angle behind; nostril between the two 

 nasals; anterior pair of nasals just in contact behind rostral; fronto- 

 nasal a trifle longer than wide, in contact with the loreal; prefrontals 

 broadly in contact; frontal divided transversally in the mid-region, 

 entirely separated from the supraoculars by a single row of granules; 

 a pair of frontoparietals separated from the third supraocular, and 

 part of the fourth by a double row of granules; five occipitals in a 

 transverse row, the outer two slightly posterior to the others, the 

 median scale slightly smaller than the rest; six supraciliaries ; four 

 supraoculars, the posterior one very much smaller than the others, 

 the first separated from the loreal; the three posterior supraoculars 

 separated from the supraciliaries by a double row of granules; last 

 two supraoculars separated from the outer occipitals by four or five 

 rows of granules; five and six supralabials; five and six large infra- 

 labials ; between inf ralabials and chin-shields a wedge of a single row 

 of granules extending anteriorly to the first chin-shield; chin and 

 throat, except near the folds covered with small scales, the median 

 posterior ones largest but varying gradually into the others; on the 

 area between the two throat folds four or five irregular rows of scales ; 

 under side of the body with ten longitudinal and thirty-four trans- 

 verse rows of plates, the two outer longitudinal rows formed of nar- 

 rower and rounded plates; preanal plates in a triangle of three large 

 ones cut into in the middle of its base by a small scale, and completed 

 at the basal angles by two larger scales; on the lower arm a double 

 row of antebrachials, the outer widest; on the upper arm a single row 

 partly double, of very large brachials which are continuous with the 

 antebrachials; on the posterior side near the elbow a single row of 

 postbrachials; under side of the thighs covered distally with three 

 and proximately with nine or ten rows of scales; sixteen femoral 

 pores; on the under side of the tibia three rows of plates, outer widest; 

 upper side of the wrist covered with scales forming a regular series of 

 longitudinal rows; inner and outer toe extending approximately the 

 same distance; tail covered with straight, keeled scales; about forty- 

 nine scales in the fifteenth ring from the base. 



Coloration: — In the badly faded specimen before us, the upper 

 surface is uniform blue-gray, the under surface milk^', the outer 

 ventrals spotted with pure white. But according to the original 

 description (Cope, Proc. Acad. nat. sci. Phila., 1862, p. 67) the color 

 was "above brownish pea-green, tail paler; in young specimen traces 

 of two lateral and one median pale line, sometimes visibly posterior 

 in adults. Occasionally a few brown spots on the rump. External 

 belly plates varied with blue and white. Inferior surfaces yellow." 



Remarks: — The description was made of an adult male that meas- 

 ured one hundred and twelve millimeters from snout to vent. 



