75 



ly live to their fourth, and never to their fifth, activity seeison. 

 Yolked follicles are present in April and oviducal eggs in May-3une. 

 The minimum reproductive size and age is 70 mm SVL and 13-1^ months, 

 respectively. Two clutches per year averaging 3.7 (1-8) eggs each are 

 laid, larger females laying larger clutches. Incubation time is 63 

 days; other reproductive aspects are discussed. Fat bodies are deplet- 

 ed during the reproductive season and are replenished before hiberna- 

 tion. They are used mainly for the first clutch and not the second. 

 Fat is also stored in the tail. All fat is used mainly for reproduc- 

 tion. 5 senile females (very large fat bodies and minute or non-exis- 

 tant ovaries during the reproductive season) were collected; they are 

 probably ^th-year females. Pesticides are not retained from one acti- 

 vity season to the next. The diet of lizards was analyzed; lepidopte- 

 ran larvae were the most important food item followed by orthopterans 

 and spiders. Pesticides were acquired through food ingestion. Lizards 

 avoided cotton rows next to roads and levees where the pesticide con- 

 centration was very high. They became active in the morning after 

 spraying was completed and thus were not directly exposed. Fat mobili- 

 zation for the first clutch occurred in May whereas heavy application 

 of pesticides did not occur until 3une. Fat body replenishment occurs 

 after pesticide application decreases, therefore this species is poten- 

 tially exposed to minimal hazards from pesticides. 



198. — , H. G. Applegate cind 3. M. Inglis. 1967. Male Cnemidophorus 

 tesselatus (Say) from Presidio, Texas. TEXAS 3. SCIENCE 19(2): 233- 

 23^. 



A photograph of a specimen with fully developed testes and repro- 

 ductive organs collected on alluvial soil of the Rio Grande valley 1 

 mi. E. of Presidio is provided. The area was formerly cultivated and 

 is now wild. The specimen is morphologically described. 



199. Schall, 3. 3. 1977. Thermal ecology of 5 sympatric species of 

 Cnemidophorus (Sauria: Teiidae). HERPETOLOGICA 33(3): 261-272. 



Five species ( exsanguis , gularis , inornatus, tesselatus and 

 tigris ) were studied in the Big Bend region of Texas. All have diff- 

 erent habitat associations, which are briefly discussed. Thermal char- 

 acteristics vary among each of 3 microhabitats within 5 major habitats 

 studied. Data on 3 different environmental temperatures and body tem- 

 peratures taken during 3 different types of behavior are given for each 

 species. Differences in thermal characteristics are thought to reflect 

 fundamental behavioral differences between species. Thermoregulatory 

 behavior in the wild and of 2 species ( exsanguis and tesselatus ) in 

 artificial thermal gradients is discussed. Overall mean body tempera- 

 tures of actively moving lizards are very similar among the species 

 studied and suggests that optimal body temperature is an evolutionally 

 conservative trait of whiptails. Cnemidophorus has among the highest 



