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Previously Neoidiotypa was a monotypic genus represented by a peculiar wasp-like richardiid from Cuba - N. appendiculata (Loew). In this work, five new species are described in this genus: N. mexicana sp. nov. from Mexico; N. alamagna sp. nov., N. flaviatra sp. nov., N. nigra sp. nov. and N. sticta sp. nov. from Costa Rica. New diagnostic characters for the genus are included. An identification key and illustrations for all species are provided.

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A new species of the genus Beebeomyia Curran found in the northern coastal region of the state of Pernambuco, northeastern Brazil is described and illustrated, including characteristics of the male and female terminalia, third instar larva and puparium. This new species is only the second record for the genus in Brazil and broadens its occurrence to the Atlantic Forest ecoregion. Beebeomyia taccarivora sp. nov. is straightforwardly distinguishable from all other known species of Beebeomyia for exhibiting an entirely yellowish orange thorax with a central brown-colored stripe on the scutum, and a brownish orange abdomen with a central brown stripe on tergites 1-4. Similarly to what had been previously described for congenerics, female B. taccarivora flies exclusively use the inflorescences of their host plant, Taccarum ulei, as oviposition and brooding sites. Developing larvae feed on living floral tissue and pollen, and pupariation occurs within the inner surface of the spathe.

Within Richardiidae, Richardia infestans, from Colombia, is the only known species to have genal processes, which are structures formed by the extension of the cuticle on the lateral margin of the gena. In the present work, six new species, with different patterns of antler‐like genal processes, are described. An identification key and illustrations are provided. Richardia bella sp. nov., R. modesta sp. nov. and R. vitta sp. nov. are recorded from Costa Rica; R. advena sp. nov. is recorded from Costa Rica and Panama; R. simplex sp. nov. is recorded from Panama; and R. ornatella sp. nov. is recorded from Ecuador.

There are 44 species of Fannia known to occur in Brazil, however, only seven of them are recorded from the Brazilian Amazon Region. Fannia bifolia sp. nov. from Pará, Brazil, is described and illustrated. Fannia itatiaiensis Albuquerque and F. pusio (Wiedemann) are newly recorded from the Brazilian Amazon Region. The known distributions of F. flavicornis Stein, F. obscurinervis (Stein), F. trimaculata (Stein) and F. trimaculatoides Couri & Pamplona are expanded. Keys to males and females of Fannia from the Brazilian Amazon Region are also provided.