256 3. IGUANID& 



55. Sator angustus Dickerson 

 SANTA CRUZ ISLAND SATOR 



Sator angustus DICKERSON, Bull. Amer. Mus. Nat. Hist., Vol. XLI, 

 1919, pp. 469, 470 (type locality, Santa Cruz Island, Gulf of 

 California, Mexico); NELSON, Mem. Nat. Acad. Sci., Vol. XVI, 

 1921, pp. 114, 115, 171. 



Description. Body and tail somewhat compressed j 

 snout low, narrow, rounded and rather long; nostrils large, 

 opening upward and outward nearer to end of snout than 

 to orbit. Head plates large, smooth, nearly flat or slightly 

 convex, interparietal largest $ frontal not divided transverse- 

 ly j four to six enlarged supraoculars, separated from the 

 frontals, frontoparietals and parietals by one or two series 

 of granules. Superciliaries long, narrow, imbricate and 

 projecting. Central subocular very long, narrow and 

 strongly keeled. Rostral and supralabials long and lowj 

 usually six, or sometimes five or seven, supralabials. Sym- 

 physeal large, followed by a series of large plates separated 

 (except first) from the infralabials by one or two series of 

 moderately enlarged sublabials. Gular region covered with 

 small, smooth, imbricate, rounded scales which change 

 gradually to granules on sides of neck. Usually a trans- 

 verse line of smaller scales across throat and sometimes at 

 this point a more or less well developed or rarely strong 

 gular fold. A patch of enlarged, convex or conical, smooth 

 upper temporals, the posterior ones just above ear often 

 keeled. Ear denticulation short, of two to four scales, the 

 largest exceeding in length diameter of largest plate in front 

 of ear. Back covered with fairly large scales of nearly 

 uniform size, in parallel rows, becoming smaller or granu- 

 lar on sides of body; dorsal scales very strongly keeled, im- 

 bricate, very shortly mucronate, with entire posterior edges 5 

 61 to 75 scales in a row from interparietal plate to backs of 



