. Bulletin. Natural history; Natural history. 162 Illinois Natural History Survey Bulletin Vol. 28, Art. 1 Table 44.—Geographic variation in Illinois Sceloporus undulatus. Figures in parentheses are numbers of specimens. Characteristic Snout-vent length (mm.) Total length (mm.), maximum Dorsal scale rows Scale rows at mid-body Femoral pores on both sides . Transverse body bands Shawnee Hills (20) Range Mean Lower Mississippi Border (12) Range Mean 38-73 173 36-44 40-48 24-32 5-9 40 36-76 174 36-43 40-50 24-30 5-8 Southern Division (20) Range Mean 51-82 190 36-4
. Bulletin. Natural history; Natural history. 162 Illinois Natural History Survey Bulletin Vol. 28, Art. 1 Table 44.—Geographic variation in Illinois Sceloporus undulatus. Figures in parentheses are numbers of specimens. Characteristic Snout-vent length (mm.) Total length (mm.), maximum Dorsal scale rows Scale rows at mid-body Femoral pores on both sides . Transverse body bands Shawnee Hills (20) Range Mean Lower Mississippi Border (12) Range Mean 38-73 173 36-44 40-48 24-32 5-9 40 36-76 174 36-43 40-50 24-30 5-8 Southern Division (20) Range Mean 51-82 190 36-42 40-49 25-31 6-8 open, dry, wooded areas, such as rocky hill- sides or wood lots. This lizard frequently is found in the vicinity of fallen trees, stumps, and rail fences, and often it is heard. Fig. 148.—Distribution of Sceloporus undu- latus. Hatching indicates the presumed range of the subspecies hyacinth'mus in Illinois; solid circles indicate localities represented by specimens examined during this study; open circles, localities represented by published records believed to be valid. The lower map depicts the total range of the species in the United States. scampering over bark before it is seen. It climbs readily and is usually alert, manag- ing to be on the side of a limb or tree trunk opposite the pursuer. When undisturbed, this lizard may be seen flattened against a limb or rock and basking in the sun. During cold or rainy weather, it seeks shelter under bark, logs, or rocks. While hunting food, the northern fence lizard has a rather jerky locomotion and stops at intervals to do "push-ups" with its front legs. Its food con- sists of insects and other arthropods, ants being especially relished (Cagle 1945). Copulation in the northern fence lizard occurs in late April and early May. Gravid females deposit elongate, soft-shelled eggs within rotten stumps or under the bark of decaying logs. Cagle (1942fl) found that 8 eggs laid the first o
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