西伯利亚蝮指名亚种Gloydius halys halys
地方名：七寸子
曾用名：中介蝮
形态特征：成体全长雄性550～600mm，雌性略大。头略呈三角形，颈细，体粗而尾短小。瞳孔直立椭圆形。具管牙；有颊窝。头背面黄褐色至棕色，枕部有一块“八”字形深棕色斑，眼后棕色棕纹上缘有一条灰白色“眉纹”。体背颜色变异较大，土褐色、橄榄灰色、红褐色、青灰色等，具不规则深褐色横斑26～30条，此斑是由两侧圆斑不同程度愈合而成。腹面白色，躯干部染有许多黑色斑点。尾背部亦具横斑，腹面深灰色。上唇鳞多7枚，呈2-1-4式，下唇鳞8枚。背鳞起棱，23-23-19行，腹鳞152～162枚，尾下鳞39～50对，肛鳞完整。
生活习性：生活于平原、丘陵、山区，栖息于山谷、溪流、草丛、灌丛、农田、村舍附近，也见于荒漠、半荒漠地带。10月末入蛰，翌年4月上旬出蛰。食性较广，以鼠类、蜥蜴为食。卵胎生，8月产仔，每产2～7条，仔蛇全 160～200mm。
地理分布：国内见于黑龙江、辽宁、河北、内蒙古。
环渤海地区分布：辽宁、河北。
生存现状：近危（NT）。
39.Gloydius halys halys
Description Adult males up to 550-600mm in TOL, the female is larger.Body is slightly slender.Head is slightly in triangle-shaped head yellowish brown in dorsum; one “∧”shaped dark brown spot on the occipital; a thick, white bordered brown stripe on each side of cheek; the dorsum color is various: soil brown, olive grey, reddish brown and greenish grey, with 26-30 irregular dark brown horizontal spots.The ventral white, with black spots,the ventral dark grey in the ventral.7 supralabials, 2-1-4; 8 infralabials; dorsal scales are keeled, 23-23-19 rows; 152-162 ventral scales; subcaudals 39-50 pairs; anal plate is complete.
Behaviour Gloydius halys halys habitat in plains, hills, mountains, valleys, streams,grass, brushwood, farmland, cottages at the altitude of 600-1,200m.They're also found in desert and semi-desert areas.Dormant period starts at the end of October, and ends in early April.They feed on lizards and rats.They are ovoviviparous and each time 2-7 snakes are given birth in August.The newborn snakes are about 160-200 mm in total length.
Distribution China: in Heilongjiang, Liaoning, Hebei, and Inner Mongolia.Distribution around Bohai Sea: in Liaoning Province and Hebei Province.
Conservation Near Threatened (NT).
