Rand on P. 4 
Rand has studied the ecological relationships of the two anoles on St, 
Kitts in the Lesser Antilles - A. bimaculatus and A. wattsi, 
They differ in classical fashion in size, structural niche and climatic 
niche, 
Size: Bimaculatus is the giant: males (mean of largest third) 85.5 mm 
snout-vent length; females 60.5 mm. Wattsi is much smaller: males 47.5 mm; 
females 41.2 mm. 
Wattsi shows little variability in size; bimaculatus, on the other hand, 
varies greatly. The reason is not clear, It may be (1) that wattsi is 
short-lived and bimaculatus long-lived, or (2) there may be a difference in 
the variability of the size at which growth slows or stops. 
Structural niche: Bimaculatus is much more arboreal than wattsi. In 
the coconut groves at Conaree this is very striking. Bimaculatus lives in 
the crowns of the coconut trees and on the trunks, wattsi in the dead fronds 
and other heaps of trash at the tree bases, The crowns are refuges for 
bimaculatus, the interior of the trash heaps for wattsi, 
Climatic niche: Moisture seems to be the climatic variable separating 
the species, Wattsi is more moisture-dependent and finds in the trash heaps 
of coconut groves moisture reservoirs in dry periods. A series of censuses 
of the two species consequently leads to quite different results: the 
number of bimaculatus seen remains essentially constant but the number of 
wattsi fluctuates widely. A plot of census results as per cent wattsi 
shows correlation with the number of days since the last rain (and also with 
the time of day). 
Feeding differences were studied using artificial flies, Bimaculatus 
moved long distances to catch large flies, but the males ignored small flies 
unless they were very close. Wattsi, on the other hand, ignored large flies 
or moved away if they were close, Small flies were taken by wattsi, but 
they did not move as far as did bimaculatus females, 
