Fifteen species of Potnia Stål, 1866 are presented with descriptions, illustrations and a key for identification. The following nomenclatural changes are introduced: P. knightae sp.n. (from Guiana), P. miracyae sp.n. (from Costa Rica), P. diringshofeni sp.n. (from Brasil), P. webbi sp.n. (from Brazil), P. turrialbensis sp.n. (from Costa Rica), P. pinheiroi sp.n. (from Brazil), P. tapuruquarensis sp.n. (from Brasil), P. cornigera sp.n. (from Brazil) and P. inca sp.n. (from Peru). Potnia venosa (Germar, 1821) = Aconophora nigrivittata Walker, 1851, syn.n. = Potnia perobtusa Fowler, 1894, syn.n.. Potnia brevicornis Fowler, 1894, sp. reval. = Potnia brunneifrontis Funkhouser, 1943, syn.n. = Potnia maculata Funkhouser, 1943, syn.n.. Potnia jacula (Fabricius, 1803) = Potnia orthosoma Fonseca & Diringshofen, 1974, syn.n.

Fourteen species of Umbonia are presented with descriptions, illustrations, and a key for Identification. The following nomenclatural changes are introduced: Umbonia articularia Buckton, 1901, sp. reval.; Umbonia pyramidalis Fairmaire, 1846, sp. reval.; Umbonia lativitta Walker, 1851, sp. reval. = U. erecta Goding, 1920, syn.n.; Umbonia crassicornis (Amyot & Serville, 1843) = U. ermanni Griffini, 1895, syn.n. = U octolineata Goding, 1930, syn.n.; Umbonia spinosa (Fabricius, 1775) = U. reducta Walker, 1851, syn.n. = U. terribilis Walker, 1858, syn.n. = U. rectispina Stål, 1869, syn.n. = U. immaculata Funkhouser, 1943, syn.n.. Umbonia struempeli sp.n. (from Brazil); Umbonia formosa sp.n. (from Bolivia) and Umbonia richteri sp.n. (from Colombia).