The four-spotted fungus beetle is a sort of dual-charactered insect.This beetle is both destructive and a genreal nuisance. But on the other hand, it kills corn larvae.
McCoy, C. E. and Brindley, Tom A.
"Those Four-Spotted Bugs... Friend or Foe?,"
Iowa Farm Science: Vol. 6
, Article 5.
Available at: https://lib.dr.iastate.edu/farmscience/vol6/iss11/5