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Argentinoeme Bruch (1911) remained as a monotypic genus until the finding of the material herein described. The type species of the genus, A. schulzi Bruch (1911) from Argentina, is characterized by 12-segmented antennae, cylindrical pronotum with granulations at its base, femora narrowing only toward their bases, and divided eyes. Argentinoeme pseudobscura sp. nov., with 11-segmented antennae and appendiculate distal segment, constitutes the second known species of this genus.
Fifteen species of Megacyllene occur in Argentina: M. acuta (Germ.), M. bonplandi (Gounelle), M. castanea (Laporte & Gory), M. insignita (Perroud), M. falsa (Chevrolat), M. mellyi (Chevrolat), M. minuta (Chevrolat), M. multiguttata Burmeister (status nov.), . murina Purmeister), M. neblinosa new species, M. proxima (Laporte and Gory), M. spinifera (Newman), M. rotundicollis Zajciw, M. rufipes (Laporte and Gory) and M. unicolor Fuchs (=M. lateripilosa Zajciw new synonym). A Lectotype and Paralectotype are designated for M. multiguttata. Megacyllene quinquefasciata Melzer, 1931, is not considered a true Megacyllene but its generic status remains uncertain and needs further revision. Geographica1 distributions in Argentina and a key are provided.
Fourteen species of Neoclytus Thomson, 1860 occur in Argentina: N. armaticollis Zajciw, N. aulai Bruch, N. centurio (Chevrolat), N. curvatus (Germ.) N. delicatus (Gounelle), N. famelicus (Burmeister), N. guianensis (Laporte & Gory), N. mulleri Fuchs, N. patagonicus (Bruch) comb. nov., N. pusillus (Laporte & Gory), N. rufus (Olivier), N. sobrinus (Laporte & Gory), N, stillatus Aurivillius (=N. parumnotatus Zajciw syn. nov.) and N. ypsilon (Chevrolat). N. armaticollis, N. delicatus and N. stillatus are new records for Argentina. The geographical distribution in Argentina and a key for species are given.