. Bulletin. Natural history; Natural history. 194 Illinois Natural History Survey Bulletin Vol. 28, Art. 1. Fig. 186.—An adult Opheodrys =vernalis blancliardi from Livingston County, Illinois. The color above is bright or dull green; below, white. Chlorosoma vernalis, Kennicott 1855:592. Cyclophis vernalis, Davis & Rice 1883<i:29. Contia •vernalis, Boulenger 1894:259. Liopeltis vernalis, Cope 1900:783. Eurypholis vernalis, Schmidt & Necker 1935: 68. Entechinus vernalis, Pope 1937:216. Opheodrys vernalis, Necker 1938:2. Diagnosis.—A small green snake (larg- est Illinois specimen 565
. Bulletin. Natural history; Natural history. 194 Illinois Natural History Survey Bulletin Vol. 28, Art. 1. Fig. 186.—An adult Opheodrys =vernalis blancliardi from Livingston County, Illinois. The color above is bright or dull green; below, white. Chlorosoma vernalis, Kennicott 1855:592. Cyclophis vernalis, Davis & Rice 1883<i:29. Contia •vernalis, Boulenger 1894:259. Liopeltis vernalis, Cope 1900:783. Eurypholis vernalis, Schmidt & Necker 1935: 68. Entechinus vernalis, Pope 1937:216. Opheodrys vernalis, Necker 1938:2. Diagnosis.—A small green snake (larg- est Illinois specimen 565 mm. in total length), fig. 186, with 15 rows of smooth sales around the body; ventrals 127 to 150; caudals 71 to 91; supralabials 7+7; infra- labials usually 7 + 7; preoculars 1 or 2, and postoculars 2 on each side. Variation.—In this subspecies the male has a higher caudal count and a longer tail but fewer ventrals than the female. Twen- ty-two male specimens have 127 to 140 ven- trals (average ) and 79 to 96 caudals (average ) ; the tail length ranges from to (average ) per cent of total length. Twenty-seven females have 134 to 150 ventrals (average ) and 71 to 86 Table 56.—Geographic variation in Illinois Opheodrys vernalis. Figures in parentheses are numbers of specimens. caudals (average ) ; the tail length ranges from to (average ) per cent of total length. Newly hatched green snakes are dark olive-green. The slightly older juveniles are gray-green. Necker (1939a) reported bufif- colored anomalies in yearling snakes. Young specimens are proportionately larger headed and shorter tailed than adults. The onto- Table 55.—Ontogenetic variation in propor- tionate tail length in three size classes of Illinois Opheodrys vernalis. Figures in paren- theses are numbers of specimens. Total Length (mm.) Tail Length as Per Cent OF Total Length Male Female Under 200 (10) (7) (5) (11) 200-400 Over 400 (7)
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