662 REPORT OF NATIONAL MUSEUM, 1902. 



third almost as long 1 as the others together; superciliary ridge consist- 

 ing of one very long and narrow anterior shield, followed by a double 

 row of small scales separating the supraocular granules from those sur- 

 rounding the e} r e ; loreal rows four; subocular semicircle keeled, broadly 

 in contact with supralabials; eight sup ralabials, keeled, the sixth being 

 under the center of the eye; temporals granular with a well-developed 

 double supratemporal line of scales; dorsal scales small, much smaller 

 than ventrals or those on upper side of arm, keeled, gradually fading 

 into the lateral granules; ventrals large, imbricate, sharply keeled, 

 the keels forming continuous ridges, those on throat much smaller, 

 narrow; arms above and femur anteriorly covered with keeled scales 

 fully as large as the ventrals; scales covering hands and feet above 

 strongly pluricarinate; digits very long and slender, expansion moder- 

 ate; 20 lamellae under phlanges ii and iii of fourth toe; tail very long, 

 more than twice the length of head and body, moderately compressed, 

 covered by large, imbricated, keeled scales with but very slight indi- 

 cations of verticils, and the median series above consisting of similar 

 only somewhat larger scales forming a feebly serrated edge; dewlap 

 naked with distant series of scales, the edge thickened; postanal plates 

 scarcely indicated. 



Dermal fold on nape and back very strongly developed in life. 



Dimensions. 



mm. 



Total length 145 



Tip of snout to vent 42 



Vent to tip of tail 103 



Tip of snout to ear 14 



Width of head 7 



Fore leg - — 17 



Hind leg 31 



The females have a mere indication of dewlap and nuchal fold; the 

 young are devoid of both. 



Variation. — The most important variation in this species appears to 

 be in the size of the dorsal scales. Thus in the specimen figured the 

 median dorsals are nearly as large as the ventrals, while in the one 

 described they are much smaller. The single row of scales separating 

 the supraocular semicircles is sometimes disconnected sufficiently 

 to allow a pair of the semicircular shields to touch. The loreal rows 

 vary between four and five, exceptionally six, etc. The relative size 

 of the scales on the interorbital space and in the frontal hollow is also 

 variable. 



Colors of living animal. — Adult male,' U.S.N.M. No. 26799 (L. S. 

 No. 9001); San Antonio, near San Juan, February 12, 1900. Iris dark 

 brown; upper surface dull clay-colored, more dusky along the median 

 line; head darker, more brownish; from eye to half way down the 

 side of neck a broad black line, and another on the edge of the lower 



