10 



Running speed was reduced by an average of 36% by removing tails 

 in lizards collected in Nebraska. Tail autonomy occurs less frequently 

 and less easily in lizards that utilize speed for escape, such as this 

 species, than in species that utilize tail-breakage for escape. 



lii. —. cind G. D. Schrank. 1972. Reproductive potential of female 

 whiptail lizards, Cnemidophorus gularis gularis . HERP. 28: 217-222. 



The reproductive cycles and size and age at maturity are discuss- 

 ed for a population near San Angelo, Texas. As many as 50% of the fe- 

 males do not mature until their second reproductive season. Those that 

 mature during their first season do so late and lay one clutch of 3-^ 

 eggs. Older females lay 2 clutches per year averaging 5 eggs each. 



15. Barbault, R. 1977. Etude comparative des cycles journaliers d' 

 activite des lezards Cophosaurus texanus , Cnemidophorus scalar is et 

 Cnemidophorus tigris dans le desert de Mapimi (Mexique). BULLETIN 

 SOCIETE ZOOLOGIQUE DE FRANCE 102(2): 159-168. 



_C. tigris is active on a daily basis in July between 0900 and 

 1700 hours with peak activity occurring at 1300 hours. Activity graphs 

 presented show the species to be more active on cloudy than sunny days. 

 Cloacal temperatures of active lizards average 37.13°C. with average 

 air and soil temperatures of 27.46°C. and 3^.76°C., respectively. It 

 is suggested that density estimates based on line transect data be made 

 over many days and times of varying environmental conditions to be va- 

 lid. 



16. — , C. Grenot et Z. Uribe. 1978. Le partage des ressources ali- 

 mentaires entre les especes de lezards du desert de Mapimi (Mexique). 

 TERRE ET VIE 32(1): 135-150. 



Cnemidophorus tigris and C. inornatus are optimally specialized 

 to eat termites, but are essentially opportunistic feeders with highly 

 diversified and largely overlapping diets. C^. inornatus avoids compe- 

 tition by living in a specialized microhabitat (Hilaria mutica communi- 

 ties). 



17. — . and M.-E. Maury. 1981. Ecological organization of a Chihua- 

 huan desert lizard community. OECOLOGIA 51(3): 335-3^2, 



This study investigates niche relationships among the 1 1 main di- 

 urnal insectivorous species of the lizard community in the Mapimi de- 

 sert near Ceballos, Durango, Mexico. _C. inornatus and C. tigris were 



