Dorsal scales smooth, with apical pits, and arranged in 19 rows at midbody.
Dorsal scales arranged in 17 to 23 rows at midbody, more or less obliquely.
Dorsal scales smooth or feebly keeled on the posterior part of the body, in 15 rows at midbody; ventrals 160-177; anal divided; sub-caudals 122-145.
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The scalation usually includes 21 rows of dorsal scales at midbody, all of which are keeled except the lowermost on the anterior part of the body.
The scalation usually includes 21 rows of dorsal scales at midbody, all of which are keeled (although the keels on the first scale rows are faint), 146-157 ventral scales, and 39-54 subcaudal scales.
It can be distinguished from other subspecies of M. lebetina by its higher scale counts — usually 170-175 ventrals, and 25 (sometimes 27) rows of dorsal scales at midbody — and relatively dark color pattern.
Preventral scales are snake scales positioned anterior to the ventral scales and are wider than they are long, but do not come into contact with the paraventral row of dorsal scales on either side of the body.
Keelbacks are Colubrid snakes of the subfamily Natricinae, so named because their dorsal scales exhibit strong keeling.