69 



180. — and R. K. Selander. 1976. The organization of genetic diver- 

 sity in the parthenogenetic lizard Cnemidophorus tesselatus . GENETICS 

 Zi+W: 791-805. 



An analysis of allozynnic variation in proteins encoded by 21 loci 

 of diploid and triploid populations of _C. tesselatus sampled throughout 

 its range, as well as selected samples of the parental species (sexlin - 

 eatus and tigris marmoratus in New Mexico), is reported. All triploid 

 tesselatus represent a single clone, but 12 different diploid clones 

 were identified with 1 to 4 clones recorded in each population sampled. 

 Three possible sources of clonal diversity are discussed. It is sugg- 

 ested that _C. tesselatus is of relatively recent origin and that the 

 evolutionary potential of it and other parthenoforms is not as limited 

 as heretofore considered. 



181. Parker, W. S. 1972. Ecological study of the Western Whiptail 

 lizard, Cnemidophorus tigris gracilis , in Arizona. HERPETOLOGICA 28 

 W: 360-369. 



Seasonal activity, growth rates, tail-break frequency, population 

 structure and density, and reproduction are discussed. Comparisons are 

 made with earlier studies on this and other species. The mean distance 

 between captures was 16.2 m for 29 immatures and 21.9 m for 53 adults. 

 Tail-break frequency was relatively low in juveniles (5-10%) and high 

 in adults (30-56%). Growth rates ranged from 1.3 mm/month in adults to 

 5.0 mm/month in juveniles. Some juveniles reached minimum adult size 

 in less than one year, but others did not do so until almost 2 years 

 old. Females were gravid from April to early August and laid at least 

 2 clutches averaging 2.05 eggs each. Males had enlarged testes from 

 March through July. About 70-80% of the population was potentially re- 

 productive during the breeding season. Hatchlings emerged from mid- 

 June or early July through September. C. tigris gracilis appeared 

 equally abundant on 2 flatland desert and 3 low altitude (2f50-500 m) 

 montane study areas. Density in a third flatland area was about 13/ 

 hectare in spring and 36/hectare in late summer. Lack of male terri- 

 toriality is inferred from the presence of 5 male and 2 female lizards 

 in the same pitfall trap on one occasion. No aggressive behavior was 

 observed in over ^00 hours of field work. 



182. — . 1973. Notes on reproduction of some lizards from Arizona, 

 New Mexico, Texas and Utah, USA. HERPETOLOGICA 29(3): 258-26'f. 



Cnemidophorus exsanguis and C. tesselatus from southern New Mex- 

 ico lay 2 clutches per year. Gravid females of the former were collec- 

 ted from May 24 to July 12. Females collected on 14 and 29 June were 

 beginning their second clutch. Gravid females of the latter species 



