The following ones are considered as new species, from Brasil: Tetrapedia albodecorata (Óbidos, Pará); T. bipartita (Ouro Preto d'Oeste, Rondônia); T. garofaloi (Cajurú, São Paulo); T. helvola (Cáceres, Mato Grosso); T. hemileuca (Tefé, Amazonas); T. hypoleuca (Santa Teresa, Espírito Santo); T. imitalrix (Ouro Preto d'Oeste, Rondônia); T. melampoda (Imperatriz, Maranhão); T. spanosticta (Itajubá, Minas Gerais); T. xanthorrhina (Vila Bela, Mato Grosso); from Paraguay: T. nigropilosa (Colônia Carlos Pfannel, Guayrá); and from Argentina, T. pulchella (San Pedro Colalau, Tucumán). Some notes are added on T. alfkeni Cockerell, 1914 and on T. basalis Smith, 1879.

Two new species of Arhysosage are described: A. cactorum sp.n. from Rio Grande do Sul, Brazil and A. melanothricha sp.n. from Salta, Argentina.

Friese (1916) described Parapsaenythia flavescens, changing the name to P. argentina. This species is a Colletidae, Paracolletini and belongs in Eulonchopria Brèthes, 1909, and a new combination Eulonchopria flavescens (Friese, 1916) is proposed. The second species apparently was not described: it is a Panurgini and here described as Friesina carinulata gen.n. and sp.n.. At Berlin Museum Psaenythia bernardinensis syn.n., decribed by Strand (1910), from Paraguay, is the male of' Eulonchropiaparaguayen-sis Brèthes, 1909, syn.n.

New combinations, notes, synonymy and redescriptions of some Neotropical Halictidae bees described by Vachal (1911), are given, and a new genus Vachalias is proposed to accommodate Haliclus cosmetor Vachal, 1911. The following species of Halictus: engys Vachal, 1911, liaspis Vachal, 1911 and rohdei Vachal, 1911 are transfered to Augochlora (Augochlora) Smith, 1853; H. levinasis Vachal, 1911 is a synonym of Augochlorella striala (Pmvzmcher, 1888); H. xanthogastris Vachal, 1911 belongs to Habralictus, H. myrrhites Vachal, 1911 to Pereirapis and H. psoraspis Vachal, 1911 to Ceraialiclus. Some notes are made on the specimens of Pereirapis simotes Vachal, 1911. Haliclus psorops Vachal, 1911 is included as a synonym in Ceratalictus clonius (Brèthes, 1909) and also Oxystoglossa theia Schrottky, 1910 and Oxystoglossa thalia pauloensis Schrottky, 1910. Halictus selloi Vachal, 1911 belongs to Augochloropsis (Augochloropsis). The lectotypes are designated for the following species: Halictus simotes and H. cosmetor.

The species of the tribe Paracolletini are presented as the first part of a commented catalog of Colletidae bees, frora the Neotropical Region. The geographic distribution, flowers, biological behaviour, taxonomy, type locality and depositary museums are mentioned, bibliographic information are given for each species and a new genus, Actenosigynes, is proposed to Leioproctus (L.) fidvoniger Michener, 1989.

A key and short descriptions are given to the males of the eleven species of Euglossa Latreillle, 1802. collected in cineole; eugenol and vanillin in natural forest reserves of the Northeast of São Paulo State (Cajuru, Sertãozinho, Dumont, Ribeirão Preto, Luís Antônio and Pedregulho). Namely: E. imperialis Cockerell. 1922; E. annectans Dressler. 1982; E. pleosticta Dressler. 1982; E. townsendi Cockerell. 1904; E. melanotricha Moure, 1967; E. cordata (Linaeus, 1758); E. securigera Dressler, 1982; E. fimbriata. sp.n.; E. leucotricha. sp.n.; E. truncata, sp.n. and E. violaceifrons, sp.n..

Recently I have seen some bees from the State of Bahia, and because they are relatively rare the opportunity is taken to complete the short description of Oxaea rufa Friese, 1898, and register the new locality for this species and for Oxaea schwarzi Moure & Seabra, 1962. Euglossa (Euglossella) cyanochlora. the largest known Euglossa Latreille, 1802 (length 19,5mm), a visitor of flowers of Solanaceae, is described as new. It is from Itamarajú. on the Southernmost part of Bahia. Euglossa (Euglossa) perfulgens Moure, 1967, belongs in the subgenus Euglossella Moure, 1967.

The type specimens of Neotropical Teirapedia (s. str.) described by Friese, 1899, namely T. peckoltii, T. curvirarsis, T. amplitarsis and T. pyramidalis are redeseribed. T. xanthostigma Schrottky, 1913, is considered as synonym of T. pyramidalis Friese. 1899.

The following species of Friese's Tetrapedia are removed from this genus to Paratetrapedia pallidipennis (Friese, 1899), Paratetrapedia flaviventris (Friese, 1899). Xanthopedia iheringii (Friese, 1899) and Lissopedia globulosa (Friese, 1899). When necessary lectotypes are proposed and redescriptions provided. Paratetrapedia (Xanthopedia) tricolor Michener & Moure, 1957, is considered a synonym of Xanthopedia iheringii, and Arhysoceble melampoda Moure, 1948, of Arhysoceble picta (Friese, 1899). These specimens belong to the Zoologisches Museum der Humboldt Universität, Berlin.

Rhynosielis, gen.n. is proposed as new genus for Anthidium multiplicaium Smith, 1879. It has in commom wilh Hoplostelis a strong basal tooth on upper border of mandibles. Main differences with Hoplostelis are: mandibular shape, configuration of mandibular teeth on apical border, a rounded tubercule on upper clypear third, mesoscutum posteriorly bigibbous, scutellum transverse-bigibbous, preepisternal carina laminate and almost complete, basal portion of propodeum without foveae and a median carina on last three terga.

This species from the Mata Atlântica resembles Melipona lateralis Erichson, 1848 and M. seminigra Friese, 1903 from the Amazonian Region. It can be easily distinguished from the first and its nearest relalive, M. scutellarís Latreille, 1811 by having a more shining mesoscutum and from the second by the yellow facial markings.

Saranthidium marginatum, sp.n. from Brazil (Minas Gerais and Parana) and Argentina (Misiones) and Hypanthidium erythrogaster, sp.n. from Brazil (Bahia, Espirito Santo, Rio de Janeiro, Minas Gerais and Mato Grosso do Sul) are described.