CHECKLIST OF REPTILES OF MEXICO 77 



ENYAUOSAURUS ERYTHROMELAS (Bonlenger) 



Ctenosaura erythromelas Boulenger, Proc. Zool. Soc. London, 1886, p. 241, pi. 



23 (color). — Bailey, Proc. U. S. Nat. Mus., vol. 73, art. 12, 1928, pp. 46-48, 



pis. 28, 29. — Smith, Occ. Pap. Univ. Michigan Mus. Zool., No. 388, 1938, p. 15. 

 Cachryx erythromelas, Cope, U. S. Nat. Mus. Bull. 32, 1887, p. 43. 

 Ctenosaura (Cachryx) annectens Werner, Jahrb. Hamburg Wiss. Anst., pt. 2, 



1911, p. 25 (locality unknown; P. Phol collector, Hamburg Museum; 



"Mexico"). 



Type.— Brit. Mus. Nat. Hist. No. 1 (Jide Bailey, loc. cit., p. 48) ; 

 purchased alive. 



Type locality. — Unknown; here restricted to Balchacaj, Campeche. 

 Range. — Known only from Balchacaj, Campeche. 



ENYAUOSAURUS DEFENSOR Cope 



Cachryx defensor Cope, Proc. Acad. Nat. Sci. Philadelphia, 1866, p. 124; Proc. 



Amer. Philos. Soc, 1869, pi. 10. — Bocourt, Mission scientifique au Mexique 



. . ., Etudes sur les reptiles, livr. 3, 1874, pp. 148-149, pi. 17 bis, fig. 12, 12a. 

 Ctenosaura defensor, GOnther, Biologia Centrali-Americana, Reptilia and Ba- 



trachia, 1890, pp. 58-59. — Bailey, Proc. U. S. Nat. Mus., vol. 73, art. 12, 



1928, pp. 48-50, pi. 30. 



Type.—U. S. N. M. No. 12282; male, adult, and half grown, three 

 CO types; Arthur C. V. Schott collector. 



Type locality. — Yucatan, here restricted to Chichen Itza. 



Range. — Northern part of the Yucatan Peninsula. Reported 

 only from Chichen Itza, Yucatan. 



Genus DIPSOSAURUS Hallowell 



Dipso-saurus Hallowell, Proc. Acad. Nat. Sci. Philadelphia, vol. 7, 1854, p. 92. 



Genotype. — Crotaphytus dorsalis Baird and Girard. 



Range. — Sonora, Baja California, and some coastal islands of the 

 Gulf. In United States: southern and central Arizona, Colorado and 

 Mojave Deserts east to the Colorado River, southern Nevada, and 

 Utah. 



Species. — Three, with five forms recognized. 



KEY TO MEXICAN SPECIES OF DIPSOSAURUS 



1. Two or more scale rows between nostril and rostral (62-83 percent) ; frequently 



with longitudinal dark lines on the body dorsalis dorsalis (p. 78) 



One scale row between nostril and rostral (75 to 80 percent) ; dark lateral lines 

 usually lacking 2 



2. Dorsal pattern consisting of large, round, white spots, and no longitudinal lines; 



brown reticulation on throat enclosing round or oval cream spots. 



dorsalis sonoriensis (p. 79) 



Dorsal pattern consisting of short longitudinal streaks, and few if any light 



spots, which are not dark-edged; throat either striped with dark longitudinal 



streaks or without streaks, in which case large rounded spots are present. 3 



