Penthimia nigra is a species of leafhoppers belonging to the family Cicadellidae subfamily Deltocephalinae.

The coloration of the body varies from black (typical form) to reddish brown, with two orange spots or more or less extended reddish areas on the pronotum.

In this species is quite evident the row of spines on the tibia 3 characterizing Cicadellidae.

Adult leafhoppers can mostly be encountered from April through July feeding on sap of deciduous trees, especially poplars (Populus species) and oaks (Quercus species).

Although fit to fly, they sometimes prefer to jump away when disturbed.