Form of clypeus and pronotum. 25 Parapucaya sp. (clypeus thickened with sharp crest on margins) 26 Cyclocephala melanocephala (Fabricius) (clypeus not thickened, margins weakly raised, rounded). 27 Stenocrates sp. (clypeus trapezoidal, pronotum not produced anteriorly at middle) 28 Dyscinetus sp. (clypeus subtrapezoidal, pronotum with anterior margin produced at middle). Form of clypeus in posterodorsal view Mentum 29 Ancognatha sp. (with furrow) 30 Cyclocephala sp. (without furrow, weakly emarginate). (figures 28–30 from Ratcliffe 2003, by permission).