The flathead snake is thought to be nocturnal, but can be found during the day under logs, rocks, and other moist debris, but during summer the snake burrows deeply into the ground as the soil surface dries (2). The flathead snake’s diet consists of a variety of arthropods, including scorpions, spiders and centipedes (2).
Like all members of the genus Tantilla, the flathead snake possesses moderately enlarged teeth at the end of each upper jaw bone, along with rudimentary toxin glands. The toxins from the glands enter the saliva of the flathead snake and are not directly injected into prey items, but nevertheless the toxins help the flathead snake to incapacitate its prey (2). The toxin is not harmful to mammals, and this snake is safe to handle (2) (3).
The flathead snake lays its eggs between April and May under rocks in shallow underground hollows or within decaying vegetation (1) (5). The average clutch size of this species is between one and four eggs, and this snake is thought to produce a single clutch a year, which usually hatch in September. The young are about seven centimetres long at birth (5).