Dipsas oneilli, also known commonly as O'Neill's tree snake, is a species of snake in the subfamily Dipsadinae of the family Colubridae. The species is endemic to Peru.

Etymology The specific name, oneilli, is in honor of American ornithologist John P. O'Neill. (Sibynomorphus oneilli, p. 195).

Geographic distribution Dipsas oneilli is found in the Andes of northwestern Peru, on both the Pacific slope and the Amazonian slope, at elevations of .

Behavior Dipsas oneilli is arboreal.

Diet Dipsas oneilli preys predominately upon mollusks.

Reproduction Dipsas oneilli is oviparous.

References

Further reading

(Dipsas oneilli, new combination). (in English, with an abstract in Spanish).

(Sibynomorphus oneilli, new species).