48 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 122 



1 May. The two lizards were again seen displaying to each other in the same 

 general area as on 27 April but a bit nearer No. 4's usual perch than last time. 

 This time both retreated with No. 4 moving away first and then No. 7. 



(2) Hibiscus hedge, Mona [fig. 9] — A similar set of disputes between No. 4 

 and No. 18; both 36 mm males. On 14 April both No. 18 and No. 4 at different 

 times were seen chasing the same smaller lizard, No. 6. Once No. 4 chased No. 6 

 into No. IS's activity range and followed him. No. 18 charged at No. 4, who ran 

 back into his activity range. Twice No. 18, in chasing No. 6, ran into No. 4's 

 area. Each time No. 4 displayed at No. 18 who displayed back and then 

 retreated. 



In the preceding two examples the encounters were brief and no 

 changes in activity range boundaries resulted. These were the most 

 common type of disputes seen between similar sized individuals and 

 seemed to serve to maintain the status quo. Occasionally disputes 

 were observed that produced changes in activity ranges. These 

 were longer and often renewed on successive days. Two examples 

 are given below; the first resulted in only a minor boundary change. 



(3) Barbican brush heap [fig. 3] — No. 1, 59 mm male; 6, 62 mm male with 

 adjacent activity ranges with one small area of overlap, a stake that was a pref- 

 erable perch on the North edge of No. I's activity range and the South edge of 

 No. 6's. 



Two encounters illustrate the original situation, when neither male 

 was using the stake frequently. 



15 January, 0905 hours. No. 1 sitting on stake well up in view, bobbing 

 occasionally. 0910 lirs. No. 6 appears in the center of the brush heap and runs 

 a foot or two towards No. 1, stops and bobs. No. 1 runs down from stake into 

 brush heap, No. 6 moves back a bit, but No. 1 continues towards tree. 



1005 Hrs. No. 6 comes over in brush heap to level of stake, apparently to 

 chase No. 152 (a smaller non-resident adult male). No. 1 comes down from tree 

 through brush to about one foot south of No. 6, tail twitching, dewlaps. No. 6 

 dewlaps, then retreats a couple of inches. No. 1 jumps towards stake, now on a 

 small twig west of stake. No. 6 retreats toward center of brush heap, bobbing. 



[The next day the situation changed:] 1540 hrs. No. 1 runs over into 

 brush heap, bobbing and tail twitching. He goes beyond the stake a short dis- 

 tance [he was probably chasing a non-resident male which I did not see]. No. 

 6 leaves his perch in the north end of the brush heap and runs toward No. 1, and 

 bobs. No. 1 retreats toward stake and No. 6 moves a bit nearer and bobs again. 



1546 hrs. No. 1 jumps to stake, crest up. 



1548 " No. 6 dewlaps, his crests are not yet up. 



1549 " No. 1 bobs. 

 1549 Yi " No. 1 dewlaps. 



1551 H " No. 6 bobs, then jumps east, moving at right angles to No. 1. 



1553 " No. 6's crests are up a little. 



1555 " No. 6 bobs. 



155 " No. 1 dewlaps; No. 6 dewlaps and back jumps, crests now full up. 



1608 hrs. No. 6 bobs. 



1609 " No. 6 turns and moves west about 6 inches, directly north of stake, 

 side-on to No. 1. 



1610 hrs. No. 6 moves about 2 feet farther west; dewlaps. 



