Length japanese snake 60-65 cm. Internasal shields of a more or less trapezoidal shape, slightly tapering in front. The seam between the maxillary and internasal scutes is not shorter than the seam between the maxillary and the first maxillary labial. The preorbital flaps 1, less often 2. Two upper labial flaps touch the eye.
On top is chocolate-brown or brown-red in color with a greenish tint, without a pattern. The upper side of the head and the front of the body are noticeably darker than the sides. The upper labial flaps are yellow with black edges or with black dots along the edges. A yellow or light yellow, slightly curved strip extends from the corner of the mouth up to the occipital region of the head. The belly is light greenish, yellowish green or yellowish. On the outer edges of each abdominal shield there is 1 dark spot, which together form on the sides of the abdomen 2 dark stripes passing to the tail. Young ones are usually dark, almost black, less often light brown
Japanese is already widespread in the USSR only in the Primorsky and Khabarovsk Territories. Outside the USSR - in Korea, East China, on about. Hai Nan and in Japan.
In the USSR, as on the mainland as a whole, a subspecies lives A. v. ruthveni (Van Denburg, 1923), different from Japanese A. v. vibakari (Boie) a smaller number of under-tail shields (respectively 45-68 pairs in the first and 57-88 pairs in the second).
Japanese already lives in cedar-broad-leaved, broad-leaved and secondary small-leaved forests. Less common in meadows in the forest.
Leads a hidden semi-underground lifestyle. Often hides under stones, felling, stumps and wood snags. Meetings with people are almost rare.
It feeds mainly on earthworms, the occurrence of which in the stomachs reaches 100%. In addition, it eats mollusks, less often small frogs and toads.
Mating takes place at the end of May. Laying 2-6 eggs 8-8.3 x 17.6-18.2 mm in size at the end of July.
Young 115-129 long and 105-195 g in weight appear in mid-September. Hatching young animals generally do not appear on the surface of the soil for a long time, hiding in forest litter, old burrows of small rodents and other shelters.
Maturity occurs with a length of at least 360 mm in females and 325 mm in males.
The number of Japanese snakes in our country is small.
Sources: Key to amphibian and reptile fauna of the USSR. Moscow, 'Enlightenment', 1977
I.P. Sosnovsky. Amphibians and reptiles of the forest, Forest industry, 1983