. Bulletin. Natural history; Natural history. November, 1961 Smith: Amphibians and Reptiles of Illinois 149. Fig. 132.—A subadult Graptemys pseudogeograpltica from White County, Illinois. The shell is light olive, dull tan, or light brown with dark smudges; the head is conspicuously -triped with yellow. ^reen, with variable pattern of narrow yel- low lines and large dark smudges; legs and head dark, with narrow yellow lines; a pair of boomerang-shaped yellow markings or large yellow blotches just behind eyes on top of head; postorbital marking separated from eye, sometimes by a diagonal yellow
. Bulletin. Natural history; Natural history. November, 1961 Smith: Amphibians and Reptiles of Illinois 149. Fig. 132.—A subadult Graptemys pseudogeograpltica from White County, Illinois. The shell is light olive, dull tan, or light brown with dark smudges; the head is conspicuously -triped with yellow. ^reen, with variable pattern of narrow yel- low lines and large dark smudges; legs and head dark, with narrow yellow lines; a pair of boomerang-shaped yellow markings or large yellow blotches just behind eyes on top of head; postorbital marking separated from eye, sometimes by a diagonal yellow line, sometimes only by dark groundcolor. Variation.—If more than one form of false map turtle is involved in our material, sexual dimorphism and ontogenetic variation are very similar in all. The male differs from the female in its smaller size, decidedly smaller head, more elliptical carapace, long claws on the front feet, longer tail, and more posteriorly situated anus. The plas- tron is proportionately larger in the female. In nine males the plastron length is to (average ) per cent of the carapace length, and in 19 females the plastron length is to (average ) per cent of the carapace length. Other differences in cara- pace ratios are noted below under onto- genetic variation and in table 40. Table 40.—Ontogenetic variation in carapace proportions of Illinois Graptemys psetido- qeographica. Figures in parentheses are numbers of specimens. Carapace L ENTCTH (mm.) Under 100, Juveniles (8) 100 150 Over 150, Characteristic Males (9.) Females (6) Females (11,) Range Mean Range Mean Range Mean Range Mean Width as percentage of length Height as percentage ol length 36,7 39,2. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these ill
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