85 



the greatest density of vegetation had the greatest density of lizards. 

 Daily activity periods became bimodal in the sunrimer. Food data is 

 summarized; individual lizards foraged at the base of vegetation and 

 moved over a wide area. Seasonal differences in food items consumed 

 correlated with seasonal differences in prey abundance. Roadrunners 

 are a major predator of C. tigris . Breeding activities peaked in May 

 and June; females produced eggs from late May until late August. Mean 

 clutch size was 2.9 (1-5) and two clutches were produced. Fat body 

 cycles for males, females, and immatures are discussed. The minimiza- 

 tion of competition with sympatric lizard species (none of them teiids) 

 by various means is discussed. 



23<>. Walker, J. M. 1966. Morphological variation in the Teiid lizard 

 Cnemidophorus gularis . PH.D. DISS., UNIV. OF COLORADO. 128 p. 



Systematic problems in this and related species are discussed. 7 

 subspecies are recognized. Cnemidophorus gularis gularis ranges from 

 southern Oklahoma through Texas (and part of New Mexico) and much of 

 northeastern Mexico. A minimum of ^ moderately distinctive morphotypes 

 are recognized within this area, but formal recognition is deferred 

 until further field work elucidates any significance to this relation- 

 ship (from abstract). 



235. Werth, R. 3. 1972. Lizard ecology: evidence of competition. 

 TRANSACTIONS KANSAS ACADEMY OF SCIENCES 75(^): 283-300. 



Cnemidophorus sexlineatus viridis and 3 other lizard species were 

 studied in Ellis County, Kansas. The habitat consisted of artificial 

 sand pits and surrounding areas. The vegetation is described; the dom- 

 inant ground cover was Buchloe dactyloides. Data on home ranges, grow- 

 th rates, and habitat preferences are given for each species. C. sex - 

 lineatus viridis did not exhibit a microhabitat preference. Burrows 

 were utilized as seasonal refuges. Lizards of this species appeared 

 later in the day but disappeared earlier in the season than the other 

 3 species. A behavioral incident suggesting a thermal sensitivity to 

 rapid temperature changes (thermesthesia) in this species is described. 

 Food items consumed by _C. sexlineatus included orthopterans (28%), 

 lepidopterans (20%), spiders (15%), and snails of the genus Vertigo 

 ('f%); diet overlapped broadly with the other lizard species. Home 

 ranges averaged .03 acres, but this value is not very reliable because 

 of the methods used in determining it. Growth and reproduction are 

 discussed. The average clutch size of 2.8 was the lowest of the ^ 

 species in this study, but _C. sexlineatus was the most numerous in the 

 area. The data presented indicate that C_. sexlineatus holds a compe- 

 titive edge in this situation, which could change as the habitat re- 

 verts to natural grassland. 



