Boelen's python

In S. boeleni adults, the upperside color pattern is dark bluish-black or purplish-black, and the anterior part of the underside is white to pale yellow. The white extends up the flanks as a series of streaks. The upper and lower lips are also patterned with pale or whitish labial scales. The black portions are commonly iridescent with an oil-slick-like sheen. The body is stocky and the head large. Neonates are predominantly red upon emerging from the egg. Gradual black pigmentation presents itself as the neonate grows and sheds. Ontogenetic color change begins as the juvenile snake approaches 1 m (39 in) in length, usually around 2 years of age. Adults may be up to 3 m (9.8 ft) in total length (including tail).

S. boeleni is found in Indonesia (Western New Guinea in the Paniai Lakes region) and Papua New Guinea (the provinces of Eastern Highlands, Central and Morobe, and Goodenough Island). The type locality given is "Dimija (3[°] 56' S, 136[°] 18' E), Wissel Lakes, Dutch New Guinea, about 1750 m (5700 feet) above sea-level" [Western New Guinea, Indonesia].

The diet of S. boeleni consists of small mammals, ground-nesting birds, and lizards.

The specific name, boeleni, is in honor of K.W.J. Boelen, M.D., who collected the holotype specimen.