Sinonatrix percarinata suriki
Eastern Water Snake
This snake is small to medium size; total length up to 100 cm. There are 17-19 (19 at mid-body) rows of scales, all strongly keeled except for the outermost row. Head is oval to slightly triangular; body is moderately stout and round; tail is long. Eye is medium to large; iris is yellow, darkened by coarse diffuse black pigment, and pupil is round, slightly off center (toward upper part of eye), black surrounded by ring of dull yellow. Tongue is flesh-colored, darkened by diffuse black pigment. Upper head is uniform dusty gray to olive gray; the labials are slightly lighter than upper head due to light gray mottling. Upper body and tail are gray to dark gray, with irregular cross bands of black or darker gray. Ventral head and neck are dirty white to light cream gray, and the following scales are tinted with gray which progressively more intense posteriorly. Ventral body and tail also bear scattered quadrangular or irregular marks of blackish pigment which are irregularly arranged on sides. Anal scale is divided and subcaudals are paired.
白腹游蛇日夜間皆有可能出沒，喜歡棲息在乾淨的溪流池塘等等水域。以捕食魚、蝦、蝌蚪雨青蛙維生。母蛇於夏季產下一窩 4-25 枚的卵，並且會有護卵的行為；初生的幼蛇大約長 17cm。當受到侵擾時，牠會躁動不安，有可能發出攻擊噬咬侵略者，並且會從泄殖腔排出影響嗅覺的警告氣味。
Sinonatrix: "Sino" 是新拉丁語 "中華、中國"; natrix is 是拉丁語 "水蛇、游蛇";
percarinata 是拉丁語 "稜脊" 的意思，形容蛇的稜脊。
在此 suriki 是來自台灣原住民的語言，形容攻擊性很強的。白腹游蛇、華游蛇、烏游蛇。