Descriptions of new species and new records of water bugs (Hemiptera: Heteroptera: Gerromorpha & Nepomorpha) from southeastern Brazil.

Although most of the diversity of true bugs (Hemiptera: Heteroptera) is terrestrial, over 550 species of water bugs (Heteroptera: Gerromorpha, Leptopodomorpha & Nepomorpha) have been recorded from Brazil alone. Southeastern Brazil, composed of the states of Esprito Santo, Minas Gerais, Rio de Janeiro and So Paulo, is the best studied region of the country, but there are still knowledge gaps in the area. Here, two new species are described from Esprito Santo: Hydrometra ruschii Cordeiro, Rodrigues & Moreira, sp. nov. and H. tuberculata Cordeiro, Rodrigues & Moreira, sp. nov. (Gerromorpha: Hydrometridae). Furthermore, new records from southeastern Brazil are provided for 78 species of water bugs, of which 19 are firstly recorded from Esprito Santo, four from Minas Gerais, eight from Rio de Janeiro, and seven from So Paulo.

New and additional records of Anacroneuria Klaplek (Plecoptera: Insecta) from Tocantins state, Brazil.

In this study we provide an updated list of Plecoptera based on recent collections covering areas from northern to southeastern Tocantins state, Brazil. It is the first work focused on the geographical distribution of the order in this region. Herein, we register Anacroneuria atrifrons Klaplek, 1922, Anacroneuria jaciara Bispo & Neves, 2005, Anacroneuria manauensis Ribeiro-Ferreira, 2001,and Anacroneuria terere Righi-Cavallaro & Lecci, 2010 for the first time to Tocantins with notes and illustrations of diagnostic features for these four species. Our work raises the number of stoneflies known from Tocantins to 13 species.Despite this increase in the number of species, we highlight the importance of expanding field collection efforts in different locations of the state, especially in the west and south regions, as well as increasing collection effort in each location, aiming for a better comprehension of this fauna.

Updated records for Leptophlebiidae (Ephemeroptera) and a new species of Thraulodes Ulmer, 1920 from Tocantins State, Northern Brazil.

An annotated checklist with complementary information for leptophlebiid mayflies from Tocantins State, Brazil is provided. Additionally, we describe a new species of Thraulodes Ulmer, 1920 based on male adults. New reports are based on collections conducted between August 2017 and August 2019 in 13 localities of 10 municipalities. A total of 436 adults distributed in 11 genera, 16 species and five morphospecies treated as undescribed species were collected. Of the total species examined, 11 are new records.

Thraulodes Ulmer 1920 (Ephemeroptera: Leptophlebiidae) from Esprito Santo state, Brazil.

Based on material collected during the past 10 years in the State of Esprito Santo and adjacent areas in Minas Gerais, Southeastern Brazil, we identified three species of the genus Thraulodes: T. itatiajanus Traver Edmunds, for which we present new records and description of the female imago; T. luisae Souto, Da-Silva Nessimian, first recorded for the state and for which we describe the nymphal stage; and T. alegre sp. nov., described based on male and female imago. The main diagnostic characteristics of the new species are: color of abdominal terga IVI whitish translucent, terga IIVI with subrectangular dark brown mark near posterior margin and with midway spot; styliger plate triangular and whitish; penes light yellow, with lateral pouch and penes spines long and tapered, with robust bases.