Lined Snake (Tropidoclonion lineatum)

Lined Snake  Tropidoclonion lineatum

by Jeff LeClere

A lined snake from Minnesota


PROTECTED. It is illegal to kill or collect this species by law in Iowa. Lined snakes are secretive and not commonly seen. We would welcome any reports of lined snakes to help us fill in the gaps of its presently spotty distribution.


This snake resembles a small, colorless garter snake. It is 8-10 inches long and is non venomous. There is little variation in this species so identification is easy. There is a light (almost always white; rarely yellow) mid dorsal stripe. There is also a light lateral stripe on each side of the snake. Ground color is gray or brown and there are some dark dots between the dorsal and lateral stripes. The belly is plain white with two rows of bold, black half moons down the center. Sometimes there is a yellowish stripe over the moons, but they still retain their boldness. This characteristic is enough to distinguish it from all our other snakes. The scales are keeled and the anal plate is single. No other Iowa snake has a double row of black half moons down the belly.

Ventral surface of a lined snake


No subspecies of Tropidoclonion lineatum are recognized any longer.


Range map for the lined snake in Iowa

The lined snake is found in scattered populations in northwestern and throughout southern Iowa. Although not under any special protection in Iowa, we would like to hear of reports of this snake.


Lined snakes are found in prairies, grasslands, pastures, woodland edges, and even city parks, city lots, cemeteries, and backyards.


Lined snakes are secretive snakes hiding beneath debris during the day. They often hunt at night above ground when earthworms are present and easily captured. This snake is inoffensive and if it were to bite, it could do no damage at all. It breeds in the fall; this is why most specimens are found (by far!) during this time in Minnesota and Iowa. I have seen many roadkilled specimens in Cherokee County in October moving to their hibernaculums. In other states, they may also be quite common in the spring, however. The female gives birth to 5-10 young in autumn. They are three inches long at birth. Lined snakes hibernate deep in the rocky outcroppings.


Lined Snakes favorite food is earthworms, but slugs, snails, soft-bodied insects are also consumed.

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