62 



The densities of ^ species of Cnemidophorus (inornatus arizonae , 

 sonorae , tigris gracilis , and uniparens ) were estimated by walking a 

 line transect. Four study areas manifesting complex habitats are des- 

 cribed. All species did not occur on all areas. _C. inornatus densi- 

 ties ranged from 2.5/hectare at the end of May to 15/hectare at mid- 

 July on the same site. _C. tigris and _C. uniparens ranged from 2-11 and 

 ^1.5- 18 lizards per hectare, respectively, at the same times on differ- 

 ent study areas. Only 8 _C. sonorae were seen during the entire study. 

 Daily and seasonal activity patterns and food items were determined. 

 Measurements of niche breadth and niche overlap were compared for syn- 

 topic species pairs and ecological differences between bisexual and 

 unisexual species were found to be minimal. The most important niche 

 components separating the species studied were macrohabitat, microhab- 

 itat, time, and food, although there is high overlap in the latter 

 three. It is concluded that these ^ species form a guild of similar 

 lizards. 



167. — . cind M. 3. Fouquette, Jr. 1978. A gynandromorphic whiptail 

 lizard, Cnemidophorus inornatus, from Arizona. COPEIA 1978(1): 156-59. 



An individual of C, _i. arizonae possessed male organs on the left 

 side and female organs on the right side of its body internally. A 



photograph is presented. 



168. Morafka, D. J. 1977a. Is there a Chihuahuan Desert? A quantita- 

 tive evaluation through a herpetofaunal perspective, jn TRANSACTIONS 

 OF THE SYMPOSIUM ON THE BIOLOGICAL RESOURCES OF THE CHI- 

 HUAHUAN DESERT REGION, UNITED STATES AND MEXICO. Wauer, 

 R. H. and D. H. Riskind, editors. National Park Service Trans, and 

 Proc. Series No. 3: i+37-i^5it. 



The Chihuahuan Desert is defined by climatological, physiograph- 

 ical and vegetational criteria. It may be defined as the North Ameri- 

 can warm desert east of the Continental Divide. It possesses great in- 

 ternal homogeneity. Cnemidophorus inornatus, _C. neomexicanus and _C. 

 tesselatus are considered to be characteristic or endemic. 



169. — . 1977b. A biogeographical analysis of the Chihuahuan Desert 

 through its herpetofauna. BIOGEOGRAPHICA, vol. 9. Dr. W. 3unk B.V., 

 the Hague, viii + 313 p. 



A monumental effort. The paleoclimatology and geologic history 

 of the Chihuahuan Desert are examined as reflected by the herpetofauna. 

 The region encompasses ^^50,000 km^ from latitude 22N to 35N and longi- 

 tude lOlW to 108W. Nine species of Cnemidophorus ( burti, exsanguis , 

 flagellicaudus, gularis , inornatus, neomexicanus, tesselatus, tigris . 



