As the common name suggests, Belocaulus angustipes are generally black and velvety in appearance as adults. Some juveniles of the species will have a pale strip in the middle.
Belocaulus angustipes are mostly active at night and in wet weather. Their diet consists of both live and decaying plant matter. Due to their large numbers in the tropical regions, the Belocaulus angustipes are a big problem for agricultural crops.