Neoidiotypa Osten-Sacken, 1878 is a rare genus of Richardiidae distinguished by its relatively large body size, wasp-like appearance, and several diagnostic morphological characters. Six valid species of Neoidiotypa are known, occurring in Central America. In this study, we describe and illustrate a new species of the genus, Neoidiotypa peruana sp. n., representing the first record of Neoidiotypa from South America. We also pr...

Planinasus Cresson, 1914 is a Neotropical periscelidid genus characterized by an abnormally large head, a characteristic more pronounced in the males of some species. It includes 18 living and one fossil species distributed in the New World Tropics, especially in Bolivia, Brazil, Ecuador, Guyana, Mexico, Peru, and the Caribbean islands. The genus was recently reviewed, however the diversity of species in Brazil, especially in...

Stenomicra Coquillett, 1900 comprises forty species worldwide, most know in the Afrotropical and Australian regions. In the Neotropical region, there are nine species of Stenomicra , and in South America, only three species are known. In the manuscript, eight new species of Stenomicra are being described from South America: Stenomicra ( Stenomicra ) dorsimaculata sp. n. , Stenomicra ( Stenomicra ) frontalis sp. n., Stenomicra...

Persis ( Eritalaena ) Fennah, 1952 is a monotypic subgenus comprising the species Persis ( Eritalaena ) fuscinervis Muir, 1918, originally described from Guyana (South America). In this study, we redescribe the genus and its sole species, incorporating additional diagnostic characters. We also provide, for the first time, photographs and detailed illustrations of the morphology of both males and females, and we expand the know...