29 



Detailed morphologies and ranges are given for Cnemidophorus bur- 

 ti_ (all subspecies), _C. exsanguis (includes flagellicaudus and sonor- 

 ae), _C. gularis , _C. inornatus (= inornatus + uniparens ), C. perplexus 

 (= neomexicanus ), C_. sexlineatus and C. velox . The lack of males in 

 exsanguis , perplexus, velox and the western populations of inornatus 

 (= uniparens ) is noted. 



79. Echternacht, A. C. 1967. Ecological relationships of two species 

 of the lizard genus Cnemidophorus in the Santa Rita Mountains of Ariz- 

 ona. AMERICAN MIDLAND NATURALIST 78(2): ^if8-459. 



Data on daily and seasonal activity patterns, food and foraging 

 behavior, intra- and interspecific encounters and reproduction are pre- 

 sented and discussed for _C. exsanguis (probably = sonorae ) and _C. tig - 

 ris gracilis . The author concludes that present competition between 

 the two is largely potential based on a seeming abundance of termites, 

 a staple food item for both species, despite the fact that the two 

 species occupy almost mutually exclusive habitats on the study area and 

 that varying degrees of difference occur in other ecological factors 

 examined. 



80. Edgren, R. A. 1955. Possible thermo-regulatory burrowing in the 

 lizard Cnemidophorus sexlineatus . CHICAGO ACADEMY OF SCIENCES 

 NATURAL HISTORY MISCELLANEA No. 1^1. 2 p. 



Individual lizards dig burrows that parallel the sand surface at a 

 depth of 20 mm, and that are approximately 1.5 times as long as the ani- 

 mal itself. They allow the belly of the lizard contact with damp sub- 

 surface sand and the back to remain in contact with the warm dry surface 

 sand. It is suggested that the lizards are behaviorally thermoregula- 

 ting. 



81. Etheridge, R. 1958. Pleistocene lizards of the Cragin Quarry 

 fauna of Meade County, Kansas. COPEIA 1958(2): 9^-101. 



Analysis of the fossil lizard fauna (including Cnemidophorus sex - 

 lineatus) , all of which are still extant today, indicates a climate of 

 less extreme winter temperatures and generally more arid conditions than 

 today during the Sangamon interglacial. 



82. Fitch, H. S. 1958. Natural history of the Six-lined Racerunner 

 (Cnemidophorus sexlineatus). UNIVERSITY OF KANSAS PUBLICATIONS, 

 MUSEUM OF NATURAL HISTORY 11(2): 11-62. 



