ANOLIS LINEATOPUS — RAND 



13 



shade rather than an abrupt change in hue, it is difficult to measure 

 in the field and I collected no quantitative data on the point. 



The lizard's behavior in moving into and out of the sun was more 

 conspicuous and more easily recorded than the color changes and 

 probably more important in thermoregulation. 



The following extract from my field notes shows the sort of behavior 

 frequently seen : 



30 January — Barbican brush heap, 900 hrs. By this time the lineatopus are 

 mostly sitting in the shade. I have the impression that they are avoiding hot 

 perches more than the sun itself. A large male is on a branch which is shaded 

 but he liimself is largely in the sun. 



One adult female, on the other hand, is sitting in a small patch of shade on a 

 branch in the brush heap. Most of her time is spent in these patches of shade, 

 where she usually sits on top of the branch. When she does leave the shade for 

 a sunny branch, she usually runs along the top, but when she stops she moves in 

 to the shade on the side. Sometimes when she runs along a sunny branch she 

 will stop and run very quickly back to the shade patch as if she had suddenly 

 become too hot. 



Table 3 shows the residts of seven censuses of adidt male A. linea- 

 topus along a stone aqueduct that runs north and south. These 

 lizards moved into the sun when they were cool and avoided the sun 

 and hot substrates when they were warm. They seemed more careful 



T.-VBLE 3. — Distribution of adult males on a stone aqueduct binder different weather 

 conditions (aqueduct runs north and south and all data was collected in the 

 morning; temperature readings are given in centigrade) 



