This blue babbler is endemic to New Guinea. The source notes that the related Dimorphic Jewel-babbler has been split off; this entry is restricted to Ptilorrhoa caerulescens.
At about 22–23 cm, most of its plumage is blue. The white chin and upper breast are bordered by a black band running from the lores across the face and breast. Its bill and legs are black. Females are described as similar to males but slightly smaller and with more white.
It inhabits moist lowland forest and forages for insects on the ground. It is shy and more often heard than seen. The source describes it as resident.
An extinction-risk assessment has not been added yet.