Agkistrodon bilineatus is a highly venomous pit viper species found in Mexico and Central America as far south as Honduras.

On the Pacific side it is found from southern Sonora in Mexico south through Guatemala, El Salvador, and Honduras.

This particular behavior is very reminiscent of caudal luring, though in a more violent fashion and is often accompanied by a strike or less commonly a gaping display similar to that of A. piscivorus.

Gaige (1936) cites one case in which a woman in Motul, Yucatán, Mexico was bitten by a 30 cm (11+3⁄4 in) specimen and died within a few hours.

Alvarez del Toro (1983) reports gangrenous tissue falling away in fragments, eventually to expose the underlying bones, describing this is as "spontaneous amputation" of the necrotic wound.

[11] In Honduras, Cruz (1987) describes the bite symptoms as being similar to those of Bothrops species, although more severe considering the small size of these snakes.

They include immediate and severe pain, oozing of blood from the fang punctures, considerable edema, nosebleed, bleeding of the gums, marked hematuria, general petechiae, shock, kidney failure and local necrosis.

[13] A new subspecies, A. b. lemosespinali, was described by H. M. Smith & Chiszar (2001) based on a single specimen from near Palma Sola, Veracruz, Mexico.