TEIID LIZARDS OF THE GENUS CNEMIDOPHORUS 137 



Santa Maria, Gadow, 190G, p. 339, F.M.N.H. ; Madera, M.C.Z. ; 

 Pacheco, M.C.Z. ; San Bias Moimfains, F.M.N.H.; Sauz, Gadow, 

 1906, p. 302, U.S.N.M., F.M.N.H.) 



The records for INIexico are as follows : 



COAlllJI'LA.— {3Ionc7ova, U.S.N.M.) . 



SO^OnA.— iHermosillo, U.S.N.M.; Nor/ales, U.S.N.M.; 2 miles 

 south of Nogales, Van Denburgh, 1922, p. 503, U.S.N.M. ; Pinetos 

 Camp, 32 miles south of Nogales, Van Denbiirgh, 1922, p. 503, 

 U.S.N.M.; San Jose dc Guaymas, M.C.Z.: San Pedro Bay, Van Den- 

 burgh, 1922, p. 503, C.A.S.)' 



HaMtat. — Although many specimens have been collected, com- 

 paratively little is known about the habitat of this form. In Colo- 

 rado, Cary (1911, p. 27) reported it as a medium-sized species "not 

 uncommon in the lowest valleys below 5,500 feet," but said (p. 40) 

 that a single specimen was seen " in the foothills near Golden in a 

 rank growth of grass on a yellow pine slope at 6,500 feet." 



A number of these lizards was collected in the arid strip beyond 

 Elephant Mesa in Brewster County, Tex., by Strecker (1909, p. 14). 

 Others were taken farther north in Upton, Reeves, and Culberson 

 Counties by the writer (summer of 1928) in a semiarid, semisandj^ 

 habitat, characterized by scattered rocks and bramble bushes. In 

 the valley of the Rio Grande, southeast of El Paso, specimens were 

 found in an area of fine gray sand where clumps of grass, bushes, 

 and ]ules of brush were present to protect them. 



A distinctive habitat is occupied by this race runner in New Mex- 

 ico. A single specimen was secured twelve miles north of Rodeo in 

 an area of fine reddish sand and few rocks, where clumps of mes- 

 quite, greasewood, and broomweed were abundant, but here tessrl- 

 latns was frequently seen and 23 examples were taken in a short 

 time. The type of habitat gradually changed as Rodeo Avas ap- 

 proached and in the region just north of that place the desert 

 shrubberv was much sparser. Here, where rocks and short clumps 

 of grass were common, 'pcTflcxus proved to be abundant, and 22 

 specimens were taken within an hour, but tessellatus was not seen. 

 Likewise, Ruthven (1907, p. 559) found that this lizard inhabits the 

 lower part of the canyons and the stony arroyos on the alluvial 

 slopes at Alamogordo. 



In Arizona, at Fort "N^'liipple, " It is the most numerous and char- 

 acteristic species (Coues, 1875, p. 603). It lives in the high, dry 

 pine and oak woods, about brush heaps, stumps, logs, etc." At 

 Tucson, according to Ruthven (1907, p. 559), it occurs in the lower 

 parts of the canyons and follows down the arroyos on the slopes 

 of the Santa Ci'iiz River where it is a characteristic reptile in the 

 willow-poplar association on the banks. "' It may or may not be 

 230G— 31 10 



