The genus Ceratina in Argentina: revision of the subgenus Neoclavicera subg. n.(Hymenoptera, Apidae, Xylocopinae). A new subgenus of Ceratina, Neoclavicera subg. n., is described toinclude its type species, Ceratina parvimacula sp. n., and ten additional species: C. asunciana Strand, C. richardsoniaeSchrottky, C. rotundiceps Smith, C. angulata sp. n., C. caveata sp. n., C. fimbriata sp. n., C. latisetis sp.n., C. subcarinata sp. n., C. tucumana sp. n., and C. umbricosta sp. n. A lectotype is designated for C. asuncianaStrand. These species are characterized by a strong pronotal carina, much as in the subgenera Crewella Cockerelland Calloceratina Cockerell, but they are distinguished by the single apical tooth on the fore and mid tibiae, andthe wax plate restricted to the second metasomal sternum. The new subgenus is distributed in Argentina, Bolivia,Brazil, Paraguay, Perú and Uruguay.
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