Swinhoe's Grass Snake, Taiwan Keelback
保育等級: 保育類 (第三級)
台灣全島海拔 500 - 1000 m 之間可見 。少見蛇類。
Small snake; total length up to 70 cm. There are 15-17 rows of scales, which are all keeled. Head is oval; body is moderately stout; tail is moderately long. Eye is medium to large; iris is dark gray brown and the pupil is round, jet black, surrounded by ring of gray. Tongue has a maroon stem and light gray fork tips. Top of head is uniform dark olive gray to olive brown and the sides are lighter. There is an oblique black band below eye and a larger black band on side of head above corner of mouth. Upper body is dark gray brown with ill-defined to fairly prominent square areas of black, usually arranged in checkerboard fashion especially in anterior two-thirds of body. There is a distinct, thick, and black chevron on the nape, whose apex points toward the body. Anterior or posterior to the cheveron bears a lighter brown to whitish area. The snake has enlarged rear fangs. Ventral head and neck are cream to dirty white. Ventral body is cream to light gray, mottled with deposits of coarse dark pigment; the pigmentation is progressively more intense posteriorly. Some individuals have blackish ventrals. Anal scale is divided and subcaudals are paired.
斯文豪氏游蛇為溫馴的日行性蛇類，喜歡棲息在山林底層、灌木林等等潮濕地區。牠以青蛙為主食。每次生產會產下 6 -15 枚的卵。當受到威脅，牠會延展頸部呈上下扁平狀，但是很難讓牠有噬咬的動作。頸部溝槽分棕色的液體，目前功用不明，推測是再禦敵或捕食時噴灑。本種有點類似 虎斑頸槽蛇台灣亞種(Rhabdophis tigrinus formosanus)。
Rhabdophis 來自希臘字 rhabdos，意思是 "棒子、魔仗"，ophis 則是 "蛇"的意思；
swinhoei: 得名自取得牠模式樣本的英國博物學家、收藏家與在台第一位歐洲領事 Robert Swinhoe。斯文豪氏游蛇，台灣頸槽蛇(大陸名)