Ptyas korros

黃頷蛇科，Colubrinae 亞種
Colubridae, subfamily Colubrinae

200 cm

台灣全島1000 m 以下低海拔區域。北部較少見，屬於罕見蛇類。

印度（阿薩姆，阿魯納恰爾邦），孟加拉國，印度尼西亞（蘇門答臘，婆羅洲，爪哇島，巴厘島），寮國，泰國，越南，西馬來西亞，新加坡島，緬甸，柬埔寨，南中國（浙江，江西，福建，廣東，廣西，海南，湖南，雲南，貴州，安徽），台灣。

Large snake; total length up to 200 cm. There are 11-17 rows of scales, which are smooth or feebly keeled posteriorly. Head is narrow, oval to slightly triangular; body is slender and tail is long. Eye is large; iris is dirty yellow to brown, heavily dappled or mottled with coarse black pigment and pupil is round, jet black, surrounded by narrow ring of dirty yellow. There are 2-4 loreals and a moderate rounded ridge from upper eye to nostril at each side. Tongue is large, with a dark gray to blue-black stem. Upper head is uniform dark olive brown and the sides are lighter in color; the labials are not black-edged. Upper body and tail are uniform dark olive to gray brown, with dark-edged scales mainly posteriorly resembling a net pattern. There are about 9 indistinct or grey longitudinal stripes along body. Juveniles have transverse rows of white spots across body anteriorly. Ventral head is creamy white to yellow. Ventral body is variable, usually yellow in neck region and anterior fifth to quarter of body, gradually merging with lighter yellow or dirty white posteriorly. Anal scale is divided and subcaudals are paired.

遇到蛇時，可以從牠是否有大眼睛、棕橄欖色的尾巴與頸後至身體前段適否有淺色細橫紋來判別是不是細紋南蛇幼蛇(只限定幼蛇、成蛇無此細紋) (Source)

korros: 根據 Stejneger (1907), korros 是爪哇語中的一種蛇，應該是指 Coluber melanurus (此名稱有個曲折的故事，可能是指 Coelognathus)、與 Schlegel,在命名 Coluber korros (現在的 Ptyas korros[細紋南蛇])時誤用的名稱。