File:Bulletin (1961) (19807431703).jpg

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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260 Illinois Natural History Survey Bulletin Vol. 28, Art. 1 Wrodia sipfdon sipedon ncc Linnaeus, H. Ciar- man 1892:269-72. Natrix sipedon, Hurler 1897:500 (I). Natrix fasciata sipedon nee Linnaeus, Cope 1900:971-2 (I). Natrix sipedon sipedon nee Linnaeus, Blanch- ard 1924/':539. Tiopidonottis sipedon ivood/iousei, Cope 1877: 64 (I). Natrix sipedon ivoodhousei, Jordan 1888:194. fTropidonotus faseiatus nee Linnaeus, Davis &: Rice 1883a:31. Nerodia sipedon faseiatus nee Linnaeus, H. Carman 1892:269-71. Natrix faseiatus nee Linnaeus, Gaige 1914:4 (I). fNatrix sp., Hankinson 1910:25 (I). Diagnosis.—A subspecies of Natrix sipe- don (largest Illinois specimen 1,144 mm. in total length), fig. 242; similar in scutellation to A'^. s. sipedon but differing in the follow- ing details of pattern: usually less than 30 body blotches, which ordinarily consist of more than 10 transverse bands on anterior part of body and less than 20 alternating dorsal spots and lateral bars; lateral dark bars and sides of transverse bands usually much narrower than light interspaces; tail with less than 19 dark rings; ventral pat- tern usually with semilunar red markings, tending to form longitudinal rows. Variation.—In addition to the dimor- phism in number of caudals and in propor- tionate tail length (which is described under A', s. sipedon), the greater length of the tail in males of N. s. pleuralis is reflected by the number of dark tail rings. Ten males at hand exhibit a range of 15 to 18 tail rings, averaging 17; 15 females show a range of 11 to 17, averaging 14.4. Ontogenetic variation of N. s. pleuralis is similar to that found in N. s. sipedon. Old
Text Appearing After Image:
Fig. 242.—An adult Natrix sipedon pleuralis from Union County, Illinois. The groundcolor is light gray or tan; the bands and blotches are rich red-brown. The underside is conspicu- ously spotted with red semilunar markings.

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