Title: Bulletin
Identifier: bulletin2819611963illi (find matches)
Year: 1918 (1910s)
Authors: Illinois. Natural History Survey Division
Subjects: Natural history; Natural history
Publisher: Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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November, 1961 Smith: Amphibians and Reptiles of Illinois 249 Natrix grahami (Baird & Girard) Graham's Water Snake Regina grahamii Baird & Girard 1853:47 (type locality: Rio Salado; revised to Salado Creek, Bell County, Texas, by Schmidt 1953) ; Kennicott 1855:592. Tropidonotus grahamii, Hay 1891:113. Natrix grahamii, Hay 1892a:589. Tropidonotus grahami, Yarrow 1882a:131. Regina grahami, H. Garman 1892:273-4. Natrix grahami, Hurter 1893:257. Tropidonotus leheris, Davis & Rice 1883^:30. Regina leberis, H. Garman 1889:132. Natrix rtgida nee Say, McLain 1899:3. Diagnosis.—A medium-sized, moderately stout-bodied water snake (largest Illinois specimen 854 mm. in total length), fig. 233, usually with 20-19-17 rows of strongly keeled scales; ventrals 158 to 173; caudals 54 to 67; anal plate divided; supralabials 7, occasionally 8 on each side; infralabials 8 to 10 on each side; groundcolor brown or dark olive above, with a yellow or a light olive-green stripe along either side of the body, involving the lower three scale rows; lateral stripe prominently bordered below by a narrow, irregular black stripe along the outer edges of the ventrals; lateral stripe sometimes bordered above by a dark line; median light stripe 2 to 3 scale rows in width sometimes present; venter yellow or greenish white, with faint median dark line or row of dots on posterior third of belly. Variation.—Males in this species differ from females in the somewhat higher ventral
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Fig. 233.—An adult Natrix grahami from Cumberland County, Illinois. The groundcolor is olive or grayish brown; the lateral bands and venter are greenish gray or yellowish white. Table 78.—Sexual variation in Illinois Natrix grahami. Figures in parentheses are num- bers of specimens. Characteristic Males (15) Females (16) Range Mean Range Mean \ entrals. . . 162-175 60-67 17.4-20.4 169.1 64.0 19.1 155-169 54-64 16.0-20.1 160.9 Caudals . . 57.4 Tail length as percentage of total length 18.2

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