Rhachidelus is a genus of snake in the subfamily Dipsadinae of the family Colubridae. The genus is endemic to South America.
The specific name, brazili, is in honor of Brazilian herpetologist Vital Brazil.
R. brazili is a medium-sized species of snake. The holotype has a total length of 1.32 m (4.3 ft), including the tail which is 0.31 m (1.0 ft) in length. The dorsal scales are smooth, have distinct paired apical pits, and are arranged in 25 rows at midbody. The vertebral row is enlarged. Adults are shiny dark brown to black dorsally, and dark brown ventrally. Juveniles have a red band across the back of the top of the head, including the parietal scales.
The diet of R. brazili consists mainly of birds' eggs.
R. brazili is oviparous.
