180 BULLETIN 199, UNITED STATES NATIONAL MUSEUM 



Cnemidophorus unicolor Cope, Proc. Amer. Philos. Soc, vol. 17, 1877, p. 93 

 (U. S. Nat. Mus.; "West Tehuantepec," Oaxaca; F. Sumichrast collector). 



Type. — Zool. Mus. Berlin; F. Deppe collector. 



Type locality. — Alexico, here restricted to Veracruz, Veracruz. 



Range. — Atlantic slopes, from central Veracruz to the Isthmus of 

 Tehuantepec. Recorded only from the states of Veracruz and 

 Oaxaca. 



CNEMIDOPHORUS GUTTATUS IMMUTABILIS Cope 



Cnemidophorus immutahilis Cope, Proc. Amer. Philos. Soc, vol. 17, 1877, p. 93 

 Cnemidophorus guttatus immutahilis, Cope, Trans. Amer. Philos. Soc, vol. 17 



1892, p. 31.— Gadow, Proc. Zool. Soc. London, 1906, pp. 309, 326-327 



figs. 74, 75. — Hartweg and Oliver, Occ. Papers Mus. Zool. Univ. Michigan 



No. 359, 1937, pp. 3-7. 

 Cnemidophorus microlepidopus Cope, loc. cit. (U.S.N.M. No. 30187; "West 



Tehuantepec," here restricted to the city of Tehuantepec, Oaxaca; F. 



Sumichrast collector). 

 Cnemidophorus guttatus striatus Gadow, Proc. Roy. Soc. London, vol. 72, 1903, 



p. 115 (Brit. Mus. Nat. Hist., "Isthmus of Tehuantepec," here restricted to 



the city of Tehuantepec, Oaxaca; Hans Gadow collector). 



Type.— U.S. ISl.M. No. 30141; F. Sumichrast collector. 



Type locality. — ^"West Tehuantepec," Oaxaca, here restricted to 

 the city of Tehuantepec. 



Range. — Pacific slopes from Colima to Chiapas. Recorded only 

 from the states of Colima (Manzanillo), Michoacan, Guerrero, Morelos, 

 Oaxaca, and Chiapas (Tonala). 



sexlineatus qjroup 



Species. — Six, with a total of 16 forms as at present recognized. 



Range. — Southern California, southeastern Wyoming, Wisconsin, 

 and Maryland southward to the Gulf of Mexico, to Guatemala and 

 into northwestern Baja California. 



Remarks. — The arrangement presented herewith for this group is 

 far from final. We have, however, made an attempt to correlate 

 zoogeography with variations pointed out by others, and the tentative 

 conclusions we trust will at least be a step forward. The present pic- 

 ture does make some geographic sense, as previous arrangements 

 have not. 



CNEMIDOPHORUS SACKII SACKU Wiegmann 



Cnemidophorus sackii Wiegmann, Herpetologia Mexicana, 1834, pp. 28-29. — 



Burt, U. S. Nat. Mus. Bull. 154, 1931, pp. 249-251.83 

 Cnemidophorus sexlineatus sackii, Burt, Proc. Biol. Soc. Washington, vol. 44, 



1931, pp. 73-78. 

 Cnemidophorus sackii sackii, Smith, Journ. Washington Acad. Sci., vol. 39, 1949, 



pp. 41-42. 



•» See also discussions in Taylor, Univ. Kansas Sci. Bull., vol. 24, 1938, pp. 520-523; Schmidt and Stuart, 

 Publ. Field Mus. Nat. Hist., zool. ser., vol. 24, 1941, pp. 244-255; and Stuart, Misc. Publ. Mus. Zool. Univ. 

 Michigan, No. 69, 1948, pp. 57-59. 



