140 BULLETIN 199, UNITED STATES NATIONAL MUSEUM 



SATOR GRANDAEVUS Dickerson 



Sator grandaevus Dickerson, Bull. Amer. Mus. Nat. Hist., vol. 41, 1919, pp. 

 469-470.— Schmidt, ibid., vol. 46, 1922, p. 665, figs. 8, 9.— Van Denburgh, 

 Occ. Pap. California Acad. Sci., No. 10, 1922, pp. 259-261. 



Type. — Amer. Mus. Nat. Hist. No. 5491; C. H. Townsend collector. 

 Type locality. — Cerralvo Island, Gulf of California, Baja California. 

 Range. — Restricted to the type locality. 



Genus UROSAURUS Hallowell 



Urosaurus Hallowell, Proc. Acad. Nat. Sci. Philadelphia, vol. 7, 1854, p. 92. — 

 MiTTLEMAN, Bull. Mus. Comp. ZooL, vol. 91, 1942, pp. 103-181, pis. 1-16. 



Phymatolepis Dumeril, Arch. Mus. Hist. Nat. Paris, vol. 8, 1856, p. 548 (type, 

 Phymatolepis bicarinatus Dumeril). 



Genotype. — Urosaurus graciosus Hallowell. 



Range. — Southern Texas west to California, entering Utah and 

 Colorado, southward through Baja California and many adjacent 

 islands, and through mainland Mexico from the western Texas border 

 south to the plateau and along the western slopes to Chiapas. 



Species. — Ten species and 21 forms are recognized; all 10 species 

 and 19 forms are laio\vn to occur or are to be expected in Mexico. 



KEY TO MEXICAN 8i SPECIES OF UROSAURUS 



1. Enlarged anterodorsal femoral scales smooth auriculatus (p. 146) 



Enlarged anterodorsal femoral scales strongly keeled 2 



2. Enlarged dorsals in a single broad band, uninterrupted by an intervening 



series of smaller scales 3 



Enlarged dorsals separated into two or more parallel series by the presence of 

 a vertebral series of smaller scales 7 



3. Tail two or more times length of head and body combined. graciosus (p. 144) 

 Tail less than twice length of head and body combined 4 



4. Dermal folds, when present, not heavilj'' crested with tubercles; blue abdominal 



patches only in males; enlarged dorsals comparatively smaU 5 



Dermal folds present, always crested with tubercles of fairly large size; 

 abdominal blue patches sometimes in females as well as males 6 



5. Enlarged dorsals larger, from 17 to 24 in length of head from tip of snout to 



posterior edge of interparietal; gular region in males deep yellow or orange. 



nigricaudus (p. 145) 

 Enlarged dorsals smaller, 32 to 36 in length of head from tip of snout to 

 posterior edge of interparietal; gular region in males usually blue. 



microscutatus (p. 145) 



6. Four to seven rows of enlarged dorsal scales; abdomen of both sexes with a 



blue wash and/or blue patches; dorsolateral folds not converging in sacral 



region gadovi (p. 145) 



About three rows of enlarged dorsal scales; only males with a blue abdomen; 

 dorsolateral folds converging in the sacral region to form prominent ridges. 



irregularis (p. 146) 



7. Three or fewer rows of lateral tubercles 12 



Four or more rows of lateral tubercles 8 



" Adapted from Mittleman, op. cit., pp. 127-133. 



