566 . PROCEEDINGS OF THE NATIONAL MUSEUM. 



projecting spines being- only low bosses or pi'otube ranees; the postocu- 

 lar boss, a broad ti-iangnlar pyramid, its three edges being continua- 

 tions of the superciliary, tiie supraocular, and the orbito-temporal 

 ridges; an abruptly raised orbito-tempoi-al ridge from tip of postorbital 

 boss to the outer edge of the suY)ratemporal expansion at the base of 

 the scale corres|)onding to the outer temporal horn in other species, two 

 scales corresponding to temporal horns slightly enlarged, depressed, the 

 posterior, or inner, slightly pointed; below the scale row forming the 

 upper posterior edge of the supratemporal expansion on each side a 

 small conical spine; supratemporal expansion very wide, nearly straight 

 behind, with a very deep and narrow occipital notch; no temporal 

 ridge; on the edge of the fold in front of the ear a vertical series of 4 

 small spines; rostral very low; supralabials very small, scarcel}^ dif- 

 ferentiated from the scale row above, about 15 in number; about 15 

 small lower labials, the posterior ones gradually increasing in size, 

 though not larger than the scutes forming the orbito-temporal ridge, 

 and with a raised keel; a small spine behind the last lower labial, 

 separated from it by a single scale; along the edge of the lower man- 

 dible a series of enlarged, strongly keeled sul)mandibulars, increasing 

 in size backward, the keels of the posterior ones slightly produced and 

 pointed behind; mandible exceedingly deep, the distance between 

 angle of jnouth and base of submandibular shields being greater than 

 the diameter of the orbit; the large tlac space between the lower 

 labials and the submandibulars covered with polygonal scales of var}'- 

 ing sizes, similar to those covering the upper surfaces of the head, 

 about 5 in a row; all head scales keeled and wrinkled; gular scales 

 small, keeled; a series of spines on each side of the posterior half of 

 the throat near the submandibulars and parallel with them; gular fold 

 with a transv^erse series of spines and a few isolated clusters of spines; 

 a very heavy angulai- fold on each side of the neck, both the vertical 

 and horizontal portion armored with clusters of large spines; back and 

 upper surface of hind legs and tail with scattered larger, bluntly 

 keeled scales, the largest with their base surrounded bj' a ''rosette" 

 of smaller scales, which are larger than those forming the general 

 dorsal lepidosis; a single series of marginal scales, which are enlarged 

 and bluntly pyramidal, set between 2 basal rows of slightly enlarged 

 scales; scales of fore legs and lower surfaces strongl}^ keeled, the 

 former pointed behind; a series of 13 (14) femoral pores on each side, 

 separated on the middle of the belly by 4 scales, the pores piercing* 

 the scales near the posterior margin; base of tail strongly swollen, 

 with 2 enlarged' postanals; tail once and a third longer than head. 

 Color (in life) "reddish — the color of di-y building sand, with very 

 obscure markings," according to Mr. Ditmars; in alcohol, pale yel- 

 lowish gra}^ with 2 faint, narrow, l)rovvnisli bands across the lower 

 back; undei'side whitish with ver^' obscure dusky spots. 



