Description of a New Species and New Records of Naucoridae (Hemiptera: Heteroptera: Nepomorpha) from Eastern Brazil.

The aquatic bug family Naucoridae (Hemiptera: Heteroptera: Nepomorpha) is currently represented in Brazil by 68 species. Although the diversity of the family has been the target of several recent studies, large areas of the country are still unexplored and several species that have been deposited in entomological collections are waiting for a formal description. Aiming to fill these knowledge gaps, a series of expeditions were carried out in six states of eastern Brazil between 2018 and 2023: Alagoas, Bahia, Ceará, Espírito Santo, Pernambuco, and Sergipe. The fieldwork targeted protected areas, but surrounding regions were also explored. The material obtained, in addition to specimens previously deposited in a national entomological collection, revealed the existence of Australambrysus margaritifer Jordão, Santos and Moreira, a new species herein described, and new records for other 11 species and two subspecies belonging to the genera Carvalhoiella De Carlo, 1963, Limnocoris Stål, 1876, Maculambrysus Reynoso-Velasco and Sites 2021, and Pelocoris Stål, 1876.

A new species of the rare Gabritini (Hemiptera: Cicadellidae: Coelidiinae) from Parque Nacional Serra das Confuses, Northeastern Brazil.

A new species of the genus Gabrita Walker, 1858 is described, from Parque Nacional Serra das Confuses, Piau, representing the first record of Gabritini for the Northeastern Region of Brazil. Gabrita confusa sp. nov. is easily recognized by the long process arising on the shaft of the aedeagus, absent in other species of the genus. A distribution map and a key to the six known species of Gabrita are provided.

Two new Peruvian species of Tichocoelidia Kramer (Hemiptera: Cicadellidae: Neocoelidiinae) with a key to males.

Two new species of Tichocoelidia Kramer, 1962 are described and illustrated, T. marceloi sp. nov. and T. vanessae sp. nov., both from Cusco, Peru. A key to males of the four known species of Tichocoelidia is provided.

Coelidinae (Insecta: Hemiptera: Cicadellidae) from Tambopata, Madre de Dios, Peru: checklist with new records and description of a new species of Daridna Walker, 1858.

A checklist of the coelidine leafhoppers of Reserva Nacional Tambopata, Madre de Dios, Peru, is provided, increasing the known diversity from 19 species and 9 genera, to 38 and 18, respectively. In addition, four species have their distributions expanded and recorded for the first time for Peru: Boliviela caverna Nielson, 2011, Carinoscapula sarcula (Nielson, 1992), Dicodia recurvata Nielson, 2011 (Coelidiini), and Plapigella elegans (Spångberg, 1878) (Teruliini). A new species of Coelidiini is also described: Daridna nielsoni sp. nov. from this reserve. A new junior synonym is also recognized: Vernobia johnsoni Nielson, 1979 equals Stalolidia amazonensis Barbosa Takiya, 2017 syn. nov.

Aquatic Insects from the Caatinga: checklists and diversity assessments of Ubajara (Ceará State) and Sete Cidades (Piauí State) National Parks, Northeastern Brazil.

BACKGROUND: Diversity and distribution of Neotropical aquatic insects is still poorly known, with many species to be recorded and many others to be described, due to the small number of taxonomists and sparse faunistic studies. This knowledge is especially poor in the Caatinga Domain in Northeastern Brazil, even though, this region may have played an important historical role in the spatial evolution of faunas of forested areas in northern South America. NEW INFORMATION: Aquatic insect checklists of 96 species from Parque Nacional de Ubajara (Ceará State, Brazil) and 112 species from Parque Nacional de Sete Cidades (Piauí State, Brazil) are presented, representing the following taxa: Elmidae, Epimetopidae, Hydrophilidae, and Torridincolidae (Coleoptera), Hemerodromiinae (Diptera: Empididae), Ephemeroptera, Gerromorpha and Nepomorpha (Hemiptera), Odonata, Plecoptera, and Trichoptera. Because of the scarce number of biological inventories in Northeastern Brazil, several new distributional records (of species, genera, and families) for Brazil, Northeastern Brazil, and Ceará and Piauí states are provided. In addition, several undescribed species were detected, being 26 from Ubajara and 20 from Sete Cidades. Results represent a significant increase to the known fauna of these states, ranging from 13%-70% increase for Ceará and 41% to 91% increase for Piauí. Although both parks are relatively close to each other and within the Caatinga domain, their aquatic fauna display a very high complementarity (89% species), possibly due to structural differences of water bodies sampled in each park. Rarefaction curves based on quantitative light trap samples suggest a much higher expected species richness of aquatic insects at Sete Cidades than at Ubajara National Park. Discussion on biogeographical affinities of this sample of the Caatinga fauna is provided.

New records of Gerromorpha and Nepomorpha (Insecta: Hemiptera: Heteroptera) from South America.

BACKGROUND: Aquatic and semiaquatic Heteroptera occur on all continents except Antarctica and occupy a wide variety of habitats, including lentic and lotic water bodies, perennial or temporary. In the Neotropical Region, there is a lack of knowledge concerning the geographical distribution of most represented species, which can only be solved by the collection of specimens in under-studied areas and publication of new records and lists of species. NEW INFORMATION: New records are presented for eleven species of Gerromorpha and ten Nepomorpha, including first records from Venezuela (Brachymetra lata, Limnogonus hyalinus, Rhagovelia evidis, Tenagobia peruana, Limnocoris burmeisteri, L. fittkaui fittkaui, Placomerus micans, and Martarega gonostyla), the Venezuelan State of Bolívar (Cylindrostethus palmaris, R. elegans, R. tenuipes, and Ambrysus stali), the Brazilian State of Bahia (Martarega bentoi), Peru (Euvelia lata), and the Peruvian Region of Arequipa (Microvelia pulchella).

Description of two new species of Martarega White, 1879 (Heteroptera: Nepomorpha: Notonectidae), one based on the mixed type-series of M. oriximinaensis Barbosa, Ribeiro & Ferreira-Keppler, 2010.

Description of two new species of Martarega White, 1879 (Heteroptera: Nepomorpha: Notonectidae), one based on the mixed type-series of M. oriximinaensis Barbosa, Ribeiro & Ferreira-Keppler, 2010. Martarega currently includes 20 species restricted to the Americas. A mixed type-series of M. oriximinaensis from Brazil was detected, including males with an additional group of ensiform bristles on the fore trochanter and mesofemur conspicuously setose. These specimens were described as a new species, M. siolii Barbosa, Nessimian & Takiya, sp. nov., and a redescription of M. oriximinaensis is also given. A second new species from Colombia is described, M. guajira Barbosa, Nessimian & Takiya, sp. nov. This species is very similar to M. pacifica, except for having groups of ensiform setae on the fore- and mesotrochanter, and an additional opaque area on the hemelytra.

A new Rhagovelia (Hemiptera: Heteroptera: Veliidae) from the Brazilian Amazon, with a key to species of the robusta group known from the country.

Rhagovelia zecai sp. nov., from the Brazilian Amazon, is described, illustrated, compared with similar species, and included in a key to species of the robusta group recorded from the country.

A new Hydrometra ( Hemiptera: Heteroptera: Hydrometridae) from northeastern Brazil, with a key to the species recorded from the country.

Hydrometra sapiranga sp. nov. is described, illustrated, and compared with similar species. An identification key to the species of Hydrometra recorded from Brazil is also presented.

The genus Buenoa Kirkaldy, 1904 (Hemiptera: Heteroptera: Nepomorpha: Notonectidae) in northern Brazil: inventory, new records, and new species.

The genus Buenoa contains 69 described species, 15 occurring in the North Region of Brazil. Here we present new records for the States of Pará, Amazonas, Roraima, and Rond6nia. We examined 16 species: B. amnigenoidea Nieser, 1970, B. amnigenopsis Nieser, 1975, B. amnigenus White, 1879, B. exilidens Barbosa, Nessimian & Ferreira-Keppler, 2010, B. dilaticrus Barbosa, Nessimian & Ferreira-Keppler, 2010, B. femoralis (Fieber, 1851), B. fuscipennis (Berg, 1879), B. incompta Truxal, 1953, B. konta Nieser & Pelli, 1994, B. macrotrichia Truxal, 1953, B. platycnemis (Fieber, 1851), B. salutis Kirkaldy, 1904, B. tarsalis, Truxal, 1953, B. tibialis Truxal, 1957, B. truxali Nieser, 1968, and B. unguis Truxal, 1953; and a new species, B. deplanatylus Barbosa & Nessimian sp. nov. We found no material of four species with bibliographic records for the region: B. communis Truxal, 1953, B. pallens (Champion, 1901), B. pallipes (Fabricius, 1803), and B. paranensis Jaczewski, 1928.

A new species of Martarega White, 1879, with new distributional records of Notonectidae (Hemiptera: Heteroptera: Nepomorpha) from Brazil.

A new species of the genus Martarega White, 1879 is described based on brachypterous and macropterous specimens, collected in three regions of Brazil [North (State of Pará), Central-West (State of Goiás), and Southeast (State of Minas Gerais)]. The new species, Martarega nessimiani sp. nov., is very similar to M. brasiliensis Truxal, 1949. These species are differentiated by the rounded shape of the patch of thin setae on the male mesotrochanter, and the angular shape of the hemelytral process stripe of the female hemelytra in the new species, whereas M. brasiliensis has the patch of thin setae with an irregular shape and the hemelytral process stripe almost straight. Illustrations of both species are presented. In addition, we give new distributional records of another 11 species of Notonectidae in Brazil: Martarega membranacea White, M. chinai Hynes, M. bentoi Truxal, M. brasiliensis, M. gonostyla Truxal, M. nieseri Moreira Ribeiro & Nessimian, Buenoa amnigenus (White), B. konta Nieser & Pelli, B. salutis Kirkaldy, B. truxali Nieser, and Notonecta pulchra Hungerford.

Veliidae (Insecta, Heteroptera, Gerromorpha) from southeastern Brazil: three new species from Rio de Janeiro State, a new species group for Neotropical Rhagovelia Mayr, and notes on distribution and synonymy / Veliidae (Insecta, Heteroptera Gerromorpha) do Sudeste do Brasil: três novas espécies do Estado do Rio de Janeiro, um novo grupo para espécies neotropicais de Rhagovelia Mayr, e notas sinonímicas e de distribuição

Microvelia nelsoni sp. nov., M. takiyae sp. nov., and Rhagovelia mangaratiba sp. nov. are described. Rhagovelia scitula and R. whitei are transferred from the robusta group to the new whitei group. Rhagovelia denticulata is synonymized under R. scitula. Microvelia longipes, Oiovelia brasiliensis, Rhagovelia sooretama, R. trianguloides, R. vaniniae, and Stridulivelia quadrispinosa are recorded for the first time from Rio de Janeiro State. Additional new municipality records in Rio de Janeiro State are presented for Microvelia braziliensis, M. ioana, M. mimula, M. pulchella, Paravelia basalis, P. itatiayana, Rhagovelia accedens, R. agra, R. aiuruoca, R. elegans, R. hambletoni, R. henryi, R. itatiaiana, R. lucida, R. macta, R. modesta, R. novana, R. scitula, R. tenuipes, R. tijuca, R. triangula, and R. zela. Corrections are presented for the previously published distributions of Rhagovelia aiuruoca, R. lucida, R. macta, and R. triangula.

Microvelia nelsoni sp. nov., M. takiyae sp. nov. e Rhagovelia mangaratiba sp. nov. são descritas. Rhagovelia scitula e R. whitei são transferidas do grupo robusta para o novo grupo whitei. Rhagovelia denticulata é sinonimizada com R. scitula. Microvelia longipes, Oiovelia brasiliensis, Rhagovelia sooretama, R. trianguloides, R. vaniniae e Stridulivelia quadrispinosa são registradas pela primeira vez no Estado do Rio de Janeiro. Ocorrências adicionais novas no Estado do Rio de Janeiro são apresentadas para Microvelia braziliensis, M. ioana, M. mimula, M. pulchella, Paravelia basalis, P. itatiayana, Rhagovelia accedens, R. agra, R. aiuruoca, R. elegans, R. hambletoni, R. henryi, R. itatiaiana, R. lucida, R. macta, R. modesta, R. novana, R. scitula, R. tenuipes, R. tijuca, R. triangula e R. zela. Correções acerca das distribuições de Rhagovelia aiuruoca, R. lucida, R. macta e R. triangula são apresentadas.