CHECKLIST OF REPTILES OF MEXICO 73 



Genus CTENOSAURA Wiegmann 



Ctenosaura Wiegmann, Isis von Oken, 1828, p. 371. — Bailey, Proc. U. S. Nat. 

 Mus., vol. 73, art. 12, 1928, pp. 1-58, pis. 1-30 (part)." 



Genotype. — Ctenosaura cycluroides Wiegmann [= C. acanthura 

 (Shaw)]. 



Species. — Five, all but one of which (C. bakeri of Utilla Island, 

 Honduras) occur in Mexico. 



Range. — Baja California, Sonora, and perhaps southern Arizona 

 on the west, and Tamaulipas on the east, south along both coasts 

 to Panama. 



KEY TO MEXICAN SPECIES OF CTENOSAURA 



1. Small scales between whorls of enlarged scales reduced to 1 row (and no more 



than 1 row) between at least a few whorls (generally near middle of tail), 



often on entire distal half or more of tail 2 



Small scales in at least one complete and another incomplete row between all 

 whorls of enlarged scales on tail 3 



2. Fifth whorl of enlarged scales preceded by more than a single row of small 



scales acanthura (p. 74) 



Fifth whorl of enlarged scales preceded by one row and one row only (no in- 

 complete row) of small scales hemilopha (p. 75) 



3. Three rows of small scales, complete or incomplete, preceding each of the 



proximal 5 whorls of enlarged caudal scales pectinata (p. 75) 



Small scales reduced to only two rows preceding one or more of the proximal 

 five caudal whorls similis (p. 73) 



CTENOSAURA SIMIUS SIMIUS (Gray) 



Iguana {Ctenosaura) similis Gray, in Griffith, Animal Kingdom, by the Baron 



Cuvier, vol. 9, Synopsis . . . , 1831, p. 38. 

 Cyclura {Ctenosaura) similis, Wiegmann, Herpetologia Mexicana, 1834, p. 42. 

 Ctenosaura similis, Bailey, Proc. U. S. Nat. Mus., vol. 73, 1928, pp. 32-37, pis. 



16-20.— Smith, Univ. Kansas Sci. Bull., vol. 22, 1935, pp. 139-140; Journ. 



Washington Acad. Sci., vol. 39, 1949, pp. 35-36. 

 Ctenosaura similis [similis], Barbour and Shreve, Occ. Pap. Boston Soc. Nat. 



Hist., vol. 8, 1934, p. 197. — Smith, Ann. Carnegie Mus., vol. 30, 1944, p. 89. 

 Ctenosaura completa Bocourt, Mission scientifique au Mexique . . ., Etudes 



6ur les reptiles, livr. 3, 1874, pp. 145-146 (Mus. Hist. Nat. Paris Nos. 2251- 



2252, La Uni6n, El Salvador; Mus. Comp. Zool., 1 spec, "Mexico"; Mus 



Hist. Nat. Paris, 2 cotypes, "Guatemala").^' 



Type. — Lost. 



Type locality. — Restricted (by Bailey) to Tela, Honduras. 



Range. — Coastal areas from the Isthmus of Tehuantepec on the 



•' We are not totally in agreement with Bailey's treatment of the species in this genus, nor with some of 

 the more recent records no doubt influenced by his work. The four forms we recognize are more or less 

 completely allopatric; at least such suggestions as of C. acanthura in Chihuahua and C. similis in Guerrero 

 appear to us wholly unwarranted . The only extensive overlapping of ranges of which we are aware occurs 

 on the Atlantic coast and involves C. acanthura and C. similis. 



88 Bocourt (loc. cit.) states that the types are from "Guatemala" and "La Union," EI Salvador. Barbour 

 and Loveridge (Bull. Mus. Comp. Zool., vol. 69, 1929, p. 247), however, state that a cotype in the Mus. 

 Comp. Zool. is from "Mexico." The type locality is here restricted to La Union. 



