. Bulletin. Natural history; Natural history. 152 Natural History Survey Bulletin Vol. 28. Art. 1 ) ; St. Clair County: (Hurter 1911) ; I'nion County: Miuhiy River (Mintoii & Minton 1948); \V'abash County: Mount Carmcl (Yarrow 1882rt) ; County: Okawville (Calm ) ; White County: Carmi (Cahn 19.^7). Graptemys geographica (Lc Sueur) Map Turtle Testudo geographica Le Sueur 1817:86, pi. 5 (type localitv: marsh on border of Lake Erie) ; Say 1823:32. Graptemys geographica, Agassiz 1857:436. Malaclcmys geographica, Hurter 1893:261. Malacoclemmys gcographicns. Yarro
. Bulletin. Natural history; Natural history. 152 Natural History Survey Bulletin Vol. 28. Art. 1 ) ; St. Clair County: (Hurter 1911) ; I'nion County: Miuhiy River (Mintoii & Minton 1948); \V'abash County: Mount Carmcl (Yarrow 1882rt) ; County: Okawville (Calm ) ; White County: Carmi (Cahn 19.^7). Graptemys geographica (Lc Sueur) Map Turtle Testudo geographica Le Sueur 1817:86, pi. 5 (type localitv: marsh on border of Lake Erie) ; Say 1823:32. Graptemys geographica, Agassiz 1857:436. Malaclcmys geographica, Hurter 1893:261. Malacoclemmys gcographicns. Yarrow 1882^: 33. Malaclemmys gcographicns, McLain 1899:1. Graptemys gcographicns, Shelford 1913:130, 135, 156. Graptemys, ?Cagle 1944*: 5-34. Diagnosis.—A large aquatic turtle (larg- est Illinois specimen with a carapace length of 239 mm.), fig. , with an obtusely oval carapace; posterior edge of carapace ser- rate; central keel spiked in juveniles; plas- tron large, solid, consisting of 12 plates; hind legs broadened, adapted for swimming; toes webbed; alveolar surfaces of upper jaw wide, lacking ridges or "teeth"; no distinct terminal notch in upper jaw; head medium- sized to large; carapace brown, olive, or green, with a vague pattern of dim light lines anil dark smudges on some or all of carapace shields; plastron plain or with var- iable plastral markings; legs and head dark, with narrow yellow lines; a small, isolated, dorsal yellow spot back of each eye; post- orbital spot separated from eye by 2 or 3 diagonal yellow lines. Variation.—The male in this species dif- fers from the female in being of smaller size and in having a narrower head, longer tail, more posteriorly located anus, and slightly smaller plastron. There is a tendency for the carapace of the male to be more oval than that of the female. In five males at hand the plastron length ranges from to (average ) per cent of the cara- pace length; in 13 females corresponding figures are 8
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
