Catching the skinks in the experimental terrarium at frequent intervals to take their temperatures involved some disturbance to them, interrupting their thermoregulatory behavior. The experimenter's first attempt to grasp a skink sometimes failed, and it then dashed about the terrarium for several seconds, probably altering its temperature somewhat. Nevertheless most of the lizards' movements were motivated by thermoregulation. This was especially evident when they were left undisturbed, and is illustrated by the following notes on behavior of an adult female and half-grown young of _fasciatus_ and a young _E. obsoletus_ on the afternoon of July 21, 1952. 2:58 All resting over cooled metal. 3:01 Female runs to line of sunshine and shadow, coming to rest with approximately half her body in sunshine, the other half in shadow over the cooled metal. 3:03 Female reverses position so that hindquarters previously in shadow are now in sunshine, and forequarters are in shadow. 3:03-1/2 Young runs to middle coming to rest in sunshine on screen. 3:04 Female moves back to the cool end. 3:05 Young moves to edge of cooled metal but not over it, in a narrow middle strip that has sunshine. 3:05-1/2 _E. obsoletus_ moves from cool end to middle, partly in sunshine. 3:07 _E. obsoletus_ adjusts its position in narrow middle strip of shadow just off the cold end. 3:08 Boards used for shading adjusted back slightly so that _E. obsoletus_ is in sunshine. 3:08-1/2 _E. obsoletus_ moves back to cold end. 3:10 Young still at middle, but resting mainly over cooled metal with tail partly in sunshine. 3:10-1/2 Young moves out into sunshine at middle. 3:11 Female moves out into sunshine at middle. _E. obsoletus_ moves over cooled metal to its edge, coming to rest partly in sunshine. 3:12 Female moves back over cooled metal. 3:13-1/2 Air temperature 33.3°C. _E. obsoletus_ shifts a short distance so that it is resting entirely over the cooled metal, with only part of its tail receiving sunshine. 3:17 Young moves about in sunshine, then comes to rest in shadow with half its body over cooled metal. 3:19 Young shifts so that more than half its body is in sunlight in middle section. 3:20 Young shifts away from sunlight, coming to rest with most of its body over the cooled metal. 3:21-1/2 Female moves from cooled metal to sunshine in middle strip. 3:23 Female moves out of sunshine, partly over edge of cooled metal. 3:30 Young moves off cooled metal, coming to rest over edge of warmed metal in narrow middle strip that is in shadow. 3:30-1/2 Young moves back away from warmed metal, pauses briefly, and then moves over cooled metal coming to rest there. 3:31 Female shifts so that about half her body is in sunshine in the middle. 3:32 Female shifts back into shadow, partly over cooled metal.