Bothrochilus is a monotypic genus containing the nonvenomous python species, B. boa, found on the islands of the Bismarck Archipelago. No subspecies are currently recognized.
Adults grow to a length of 152–183 cm (4.99–6.00 ft). The color pattern consists of a series of brilliant orange and black rings in juveniles, but this fades in about a year as the snakes mature. Adults are usually a shade of brown with black rings, or a uniform blackish brown. Usually, there is a light spot behind the eye. Some specimens may have black rings that are irregular, incompletely formed or even absent. The scales are highly iridescent.
Found on the islands of the Bismarck Archipelago, including Umboi, New Britain, Gasmata (off the southern coast), Duke of York and nearby Mioko, New Ireland and nearby Tatau (off the east coast), the New Hanover Islands and Nissan Island, the type locality given is "Nouvelle Irlande" (New Ireland).