The following new species are presented: Anthodioctes rosanae sp. nov. and Anthodioctes ayalai sp. nov. from México and Anthodioctes misiutae sp. nov. from Brazil. The male of Moureanthidium bahianum Urban, 1995 and the female of Ananthidium dilmae Urban, 1990 are described by the first time. Notes and new occurrences of Anthodioctes lunatus (Smith, 1854) are given.

The type locality, depositary museums, geographical oceurrences, biological behaviour, flowers visited and taxonomical notes from the species of the neotropical Colletini are mentioned. The following nomenclatural changes are introduced: Monidia Cockerell, 1905; Rhynchocolletes Moure, 1943; Hemicotelles Toro & Cabezas, 1997; Xanthocotelles Toro & Cabezas, 1978 and Colletes griseus Smith, 1879 are revalidated; Colletes desanlisi nom. n. is proposed to Colletes similis Joergensen, 1912, non Schenck, 1853 nec Robertson, 1904; a new combination to Mourecotelles biciliatus (Cockerell, 1918) is given. Lectotypes of the following species are designated: Colletes araucariae Friese, 1910; C. argentinas Friese, 1908; C. atripilis Vachal, 1909; C. azureus Friese, 1912; C. chalybaeus Friese, 1910; C. ciliatus Friese, 1910; C. clarus Joergensen, 1912; C. cognata Spinola, 1851; C. costaricensis Friese, 1916; C. cyaniventris Spinola, 1851; C. dimidiala Spinola, 1851; C. enodis Vachal, 1909; C. eupogonites Moure, 1949; C. extensicornis Vachal, 1909; C.fulvipes Spinola, 1851; C. glycyrrhizae Joergensen, 1912; C. griseus Smith, 1879; C. joergenseni Friese, 1910; C. laticeps Friese, 1910; C. longipes Friese, 1910; C. lycii Joergensen, 1912; C. mininca Cockerell, 1914; C. molaguensis Cockerell, 1912; C. murinus Friese, 1900; C. musculus Friese, 1910; C. neuqueenensis Friese, 1910; C. perplexas Smith, 1879; C. peruvicus Cockerell, 1913; C. plantaris Vachal, 1909; C. senilis Smith, 1879; C. speculiventris Cockerell, 1917; C. pinnatus Vachal, 1909; C. rugicollis Friese, 1900; C. schrottkyi Joergensen, 1912; C. sicheli Vachal, 1909; C. spiloptera Cockerell, 1917; C. steinbachi Friese, 1910; C. sulcatus Vachal, 1909; C. tingoensis Cockerell, 1926; C. tomentasus Friese, 1910; C. vachali Joergensen, 1912; C. virgatus Vachal, 1904; C. weiskei Friese, 1912; Monia griseaWcstwood, 1875. Are recognized as new synonyms; Colletes argentinas Friese, 1908, syn. n. of C. rugicollis Friese, 1900; C. campai Herbst, 1920, syn. n. of C. rhodaspis Cockerell, 1909; C. viridans Vachal, 1909, syn. n. of C. cyunescens (Haliday, 1837).

Ananthidium gen.n. is described The type species, Anthidium inerme Friese, 1908, is redescribed with notes on its variations and Ananthidium dilmae sp.n., from Belo Horizonte, MG, Brazil, is described.