36 Transactions of the Academy of Science of St. Louis 
lifetime of an individual is longer. A small number of eggs 
would probably make for more rapid development of the 
embryos. 
SUMMARY 
Differences in habits exist between the two species of 
Gerrhonotus studied, and there are less marked differences 
among the subspecies of each, which apparently are correlated 
with the slight differences in structure. 
Alligator lizards, in the region studied, range from the Lower 
Sonoran Life Zone to the Canadian Zone, inclusive. G. coeruleus 
occurs higher zonally than does multi-carinatus, but there is 
some overlapping between the two species in the Transition 
Recorded methods of self-protection used by alligator lizards 
mong dry leaves, or exceptionally, 
) trees or bushes; using the tail as 
moved by the enemy; 
the enemy. 
_ Animals which have been recorded as preying upon alligator 
lizards include snakes (racers, rattlesnakes, garter snakes), 
Skilton’s skink (in captivity), shrike, red-tailed hawk, and 
domestic cat. 
Insects of the larger and more 
the bulk of the diet ; beetles, caterpillars 
ak i 
lates the foraging lizard to attack, certain forms h 
Secretions seem to be habitually avoided. Smal] 
birds’ eggs are occasionally eaten, 
The breeding season apparentl ies | ithi 
T ason af y varies locally within each 
‘Species, and the species iffer in their time of mating when both 
