Ao longo de mais de 100 anos de história, o acervo do Museu Paraense Emílio Goeldi (MPEG) acumulou uma expressiva quantidade de espécies de formigas coletadas por meio de expedições científicas e por sua atuação como instituição fiel depositária. Organizar, qualificar, estudar e disponibilizar essas informações tornam o acervo uma poderosa ferramenta para estudos em diferentes áreas. Neste artigo, reportamos um breve histórico dos principais acontecimentos científicos e históricos que refletiram na formação e consolidação do acervo de formigas do MPEG, atualmente com cerca de 300.000 espécimes. Também discutimos perspectivas e estratégias adotadas, visando tornar a coleção uma referência para estudos envolvendo formigas da região amazônica.

The Amazonian region is composed by many kinds of environments, including the Amazonian savannas, which comprise about 5% of the Amazon biome in Brazil. The biota of Amazonian savannas is poorly known, especially for insects. In this study, we performed a faunistic inventory of flesh flies (Diptera: Sarcophagidae) of four Brazilian Amazon savannas, where we recorded two subfamilies, 16 genera, and 40 species, two of which are described as new to science: Lepidodexia (Notochaeta) helenae sp. nov. and Lipoptilocnema augustoi sp. nov. Oxysarcodexia graminifolia  Souza, Pape & Thyssen, 2020 is recorded for the first time for Brazil. Dexosarcophaga paulistana  Lopes (1982), Helicobia biplagiata  Dodge, 1966, Helicobia cearensis  Tibana, 1976, Oxysarcodexia simplicoides (Lopes, 1933), and Oxyvinia excisa (Lopes, 1950) are newly recorded for the Brazilian Amazon. Oxysarcodexia nitida  Soares & Mello-Patiu, 2010 is a new record for the state of Pará. The species D. paulistana is redescribed, and photographs and detailed illustrations of male terminalia are provided.

The identification of species in many genera of Neotropical Mantodea is a difficult task because of a lack of revisionary works with keys and illustrations of male genitalia. One of these genera is Pseudomiopteryx Saussure, 1870, which is known to be composed of 10 species and one subspecies of small (19–25 mm) brownish praying mantises that live in the leaf litter of tropical forests of Central America, the Amazon, and the Andean tropics. The genus is revised and the known valid species are redescribed based mainly on type-material. The results yield 11 valid species, including a new species from Costa Rica: Pseudomiopteryx riverai sp. n. Pseudomiopteryx amazonensis Toledo-Piza, 1968 is a junior synonym of Pseudomiopteryx guyanensis Chopard, 1911, and the subspecies Pseudomiopteryx bogotensis gorgonae Ariza & Salazar, 2005 was raised to species level. A syntype specimen of Pseudomiopteryx decipiens, Pseudomiopteryx guyanensis, and Pseudomiopteryx infuscata Saussure & Zehntner, 1894 was herein designated as the lectotype. New information on geographical distributions and natural history were given, and descriptions of the female, ootheca, and first instar nymph of Pseudomiopteryx spinifrons were presented. The geographical distributions of some species are extended. A key to males of all species is given, as well as detailed figures of male genitalia.

The minute litter bugs (Heteroptera: Schizopteridae) fauna from the Brazilian Amazon comprises only nine species described during the past four years. In this paper, the Schizopteridae fauna of an Amazonian savanna was surveyed, resulting in the discovery of two new species of Corixidea Reuter and a new species of Schizoptera (Cantharocoris) McAtee & Malloch: Corixidea graziae sp. nov., Corixidea quilombola sp. nov., and Schizoptera (Cantharocoris) savannensis sp. nov. The species C. graziae sp. nov. and C. quilombola sp. nov. can be distinguished from other Corixidea species by the shape of the process of mediotergite 8 while S. (Cantharocoris) savannensis sp. nov. can be recognized among species of its subgenus by a combination of the shape of the subgenital plate and right conjunctival appendage. The species herein described represent the first records of these genera for the Brazilian Amazon. We provide diagnoses, photographs of habitus, and illustrations of male genitalia.