Sumitrosis fuscicornis is a species of beetle of the family Chrysomelidae. It is found in Argentina and Brazil (Bahia).
The recorded food plants are Canavalia ensiformis, Dolichos lablab, Meibomia aspersa, Meibomia discolor, Phaseolus vulgaris, Phaseolus lunatus, Pueraria lobata, Cajanus indicus, Cajanus cajan and Glycine max.