nigrous

Sternum: nigrous, clad less densely with longer, usually fusiform, similarly colored squamae; […]

1940, Stanford University, Natural History Museum, Microentomology: Contributions to Entomology from the Natural History Museum of Stanford University, Volumes 5-8

At this hour, just before dawn, another nigrous presence came hovering over him to darken his face.

2008, Glen Craney, The Fire and the Light: A Novel of the Cathars and the Lost Teachings of Christ