12. SCELOPORUS 345 



69. Sceloporus lineatulus Dickerson 

 SANTA CATALINA ISLAND SCALY LIZARD 



Sceloporus lineatulus DICKERSON, Bull. Amer. Mus. Nat. Hist., Vol. 

 XLI, 1919, p. 467 (type locality, Santa Catalina Island, Gulf 

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

 XVI, 1921, pp. 114, 115, 171. 



Description. Head and body little depressed. Nasal 

 opening slightly nearer to end of snout than to orbit. Upper 

 head plates smooth, often a little convex, and sometimes 

 slightly imbricate 5 interparietal largest. Frontal divided 

 traversely. Parietal and f rontoparietal plates not separated 

 from large supraoculars. Latter very broad. Superciliaries 

 strongly imbricate. Middle subocular very long, narrow, 

 and strongly keeled. Rostral plate wider than high. La- 

 bials long but very low, inferior a little larger than superior. 

 Symphyseal large, followed by several plates larger than 

 gulars and separated from lower labials by from one to three 

 rows of narrow sublabials. Gular region with scales 

 smooth, bicuspid or tricuspid, and strongly imbricate, as 

 are also scales on belly. Ear-opening large, nearly vertical, 

 and protected by a series of very long, acuminate scales. 

 Dorsal scales large, equal in size or larger centrally, rather 

 weakly or strongly keeled, but strongly mucronate and ser- 

 rate arranged in nearly parallel longitudinal rows. Scales 

 of sides pointed obliquely upward, and changing gradually 

 from carinate dorsals to smaller smooth ventrals. No 

 longitudinal dermal folds. Upper surfaces of limbs pro- 

 vided with strongly keeled and pointed scales. Scales on 

 posterior surface of thigh large, acuminate, strongly keeled 

 and pointed. Upper caudal scales similar to dorsals, but 

 often having longer points. Femoral pores varying in num- 

 ber from 16 to 20 on each thigh ; average in 18 thighs, 

 18.4. Five or six dorsal scales in adults equaling length of 



