Senticolis triaspis may grow to a total length (including tail) of 160 cm (63 in).

[3] The head is elongated, the body is slender, and the smooth dorsal scales are arranged in 31–39 rows.

[3] Senticolis triaspis is well distributed in the Baboquivari, Pajarito, Atascosa, Santa Rita, Empire, Patagonia, Chiricahua, Swisshelm, Pedregosa, and Peloncillo mountains of southeastern Arizona.

[3] Senticolis triaspis consumes small animals such as lizards, birds, and bats, killing them by deadly constriction.

[2] Nota bene: A trinomial authority in parentheses indicates that the subspecies was originally described in a genus other than Senticolis.