The frontal scale is as long as its distance from the end of the snout or a little longer, as long as the parietals or a little shorter; the loreal scale is as long as deep or deeper, sometimes touching the eye; two preoculars scales and three or four postoculars; the temporals are 2 + 3 or 4; there are 7 scales on the upper lip (supralabials), the third and fourth touch the eye; 4 or 5 lower labials in contact with the anterior chin-shields, which are shorter than the posterior. The dorsal scales are strongly keeled, in 23 to 27 rows. The ventrals scutes are 144-160 in number and the anals are usually divided; the subcaudals scales are 35-50 in number. Dull green above, uniform or with traces of black markings.Young specimens show an inverted black V-mark on the neck, its apex forwards, reaching to the frontal shield, and a second much smaller one behind, the intervening space being bright yellow or orange; a black stripe from the eye to the angle of the month, and more or less regular transverse spots or cross-bars on the back and tail; belly whitish, yellow or plumbeous, rarely with darkish spots. In disposition the snake is very gentle and in threat may flatten the neck and raise the head like a cobra while other specimens may flatten the entire body on the ground.