1919] Dickerson, Diagnoses of New Species and a New Genus of Lizards 469 



hand, A. M. N. H. Nos. 12745-12752, Colima, Mexico, 1919). This 

 species has no neck fold- of any sort but it has characters — the lateral 

 granulation, lateral fold, and scale differentiation of the posterior ex- 

 tremities — which relate it definitely to Sator as well as to Uta. Careful 

 study of the skeleton may place this species under Sator 



11. Sator angustus, 1 new species 



Type.— A. M. N. H. No. 5712, cf. Collector, C. H. Townsend, Albatross Expe- 

 dition, April 17, 1911. 



Paratypes.— A. M. N. H. Nos. 5713-5723. 



Type Locality. — Santa Cruz Island, Gulf of California, Mexico. 



Diagnosis. — A striking looking lizard with compressed body in the adult, high 

 along vertebral line, and with very long and strongly compressed slender tail; bears 

 close general resemblance to Sator grandavus, new species, but differs in greater 

 size, reaching a total length of 300 mm., in coloration and pattern, in lacking the 

 posterior gular fold at the sides of the throat, in having scales of head and nape in 

 the adult more tubercular; also the tail more strongly compressed, with the 4-6 

 dorsal caudal rows quite to the end of the tail bearing high, sharp, and spine-tipped 

 scales. Dorsals average 70 from interparietal to base of tail, 14-15 in a head length; 

 femoral pores average 13. General coloration light or dark, brown or olivaceous,; 

 color pattern includes dark shoulder patches. 



12. Sator grandaevus, new species 



Type.— A. M. N. H. No. 5491, d\ Collector, C. H. Townsend, Albatross Expedi- 

 tion, April 19, 1911. 



Paratypes.— A. M. N. H. Nos. 5492-5496. 



Type Locality. — Cerralvo Island, Gulf of California, Mexico. 



Diagnosis. — A relatively large lizard reaching a total length of 250 mm., more 

 than two-thirds of which is the strongly compressed tail with verticils of strongly 

 keeled mucronate scales; body compressed and with high vertebral ridge in the 

 adult; a strong lateral fold from postauricular region to groin; broad, uninterrupted 

 band of granules along lateral fold, broadest at shoulder, meeting keeled dorsal scales 

 more or less abruptly throughout its length; a strong structural anterior gular fold, 

 marked by differentiation of scales; posterior gular fold visible laterally, marked by 

 an intrusion of granules ventralward and 3 enlarged scales of a "denticulated border"; 

 about 60 scales between interparietal and base of tail, 16 in a head length; femoral 

 pores average 18. General coloration light or dark grayish blue; color pattern in- 

 cludes black shoulder patches (sometimes nuchal collar). 



Measurements of the Type. — Head and body, 70 mm.; tail, 137 + (repro- 

 duced); head length, 18.5; head width, 15; tip of muzzle to anterior fold, 22; tip 

 of muzzle to posterior fold (at side of head), 25.5; hind leg, 55; base of 5th to end of 

 4th toe, 22. The measurement of No. 5492 in which the tail has not been reproduced 

 is as follows: total length, 258 mm.; head and body, 75; tail, 183. 



!With reference to the very narrow, compressed body in the adult. 



