Paschoal Coelho Grossi

The stag beetle genus Altitatiayus Weinreich is composed of seven flightless species, endemic to the Mantiqueira Mountains Complex. In this work, we describe two new species, Altitatiayus amantikir Soares, Koike & Grossi sp. nov. and Altitatiayus dubius Soares, Koike & Grossi sp. nov., both found in the highest peaks of the Mantiqueira mountain range. This discovery highlights the high level of endemism of the genus and suggests that new species should be found as the region is further explored. Additionally, we provide an up‐to‐date identification key for the species of the genus.

Species of the genus Brachysiderus Waterhouse, 1881 (Dynastinae), are revised, redescribed, and illustrated based on males and females, when available. A new species, Brachysiderus andinus sp. nov. , previously treated in the collections and in the literature as Brachysiderus quadrimaculatus Waterhouse, 1881, is described from the Peruvian Andes. Brachysiderus tridentiger (Prell, 1934) stat. rev. and Brachysiderus breyeri (Martínez, 1963) stat. rev. are reinstated at the species level. Identification keys for males and females are provided, along with a new distribution map including new records from Bolivia and Brazil.

The South American genus Aclopus Erichson, 1835, is herein treated in a taxonomic synopsis. Aclopus wuenschei Ohaus, 1912 syn. nov. is proposed as a junior synonym of Aclopus vittatus Erichson, 1835, and three new species of Aclopus are described: Aclopus extrema sp. nov. , Aclopus frieirocostai sp. nov. and Aclopus godinhorum sp. nov. Notes on the natural history of A. frieirocostai are also given. Furthermore, Allsoppaclopus gen. nov. is described to include Allsoppaclopus intermedius (Blanchard, 1850) comb. nov. and Allsoppaclopus dzupi sp. nov. Diagnoses, illustrations, distribution maps and identification keys for Aclopus and Allsoppaclopus species, as well as for the genera of Aclopinae, are also provided.

The Coleopterists Bulletin publishes a wide variety of articles, notes, and book reviews regarding the biology, taxonomy and ecology of beetles (Coleoptera).

Cinco especies de Homophileurus son registradas para Colombia, incluyendo dos nuevos registros provenientes de las regiones Amazónica y Orinoquia: Homophileurus amazonicus y Homophileurus integer. Las cinco especies son diagnosticadas e ilustradas. Adicionalmente, con base en su distribución en países vecinos, se considera probable que otras dos especies también estén presentes en Colombia y son ilustradas. Se presenta una clave de identificación para las siete especies.

Cyclocephala everardoi Grossi, Santos & Almeida, 2016 and Cyclocephala machadoi Grossi, Santos & Almeida, 2016 comprise a distinct species group within Cyclocephala Dejean, 1821. This group was previously characterized by species with subtrapezoidal or parabolic clypeus, large eyes, antennae with long lamellae and parameres with a spine-like process on each lateroventral region. Here, two new species of the group are described from Brazil: Cyclocephala catimbauensis sp. nov., from the Caatinga biome in Pernambuco state, and Cyclocephala nhumirim sp. nov., from the Pantanal biome in Mato Grosso do Sul state. The new species are illustrated along with their differential diagnoses. An identification key and a distribution map for species of the group are provided. Additionally, a brief discussion on the characters that define the “machadoi” group is also presented.

Agaocephala mineira new species and Agaocephala alvarengai new species (Coleoptera: Scarabaeidae: Dynastinae: Agaocephalini) are described from the southeast and northeast of Minas Gerais State, Brazil, respectively. The new species are compared with similar species, from which they differ mainly in pronotal punctation, body shape, and shape of ocular canthi. After examination of the holotype of Agaocephala urus (Thomson, 1860), this name is synonymized with Agaocephala mannerheimi Laporte, 1832, new synonym. The subgenus Agaocephala (Lycocephala) Martínez & Alvarenga, 1987 is elevated to generic status, Lycocephala Martínez & Alvarenga, 1987, new status, and its diagnostic characters are discussed. A distribution map and identification key to species are given, along with new collection records for other Agaocephala LePeletier & Audinet-Serville species. Notes on Agaocephalini are provided, and three genera previously included in the tribe, Colacus Ohaus, 1910, Democrates Burmeister, 1847, and Gnathogolofa Arrow, 1914, are considered incertae sedis. Two subtribes, Lycomedina new subtribe and Agaocephalina, are described based on morphological and geographical similarities among the genera of the tribe. A lectoype is designated for Agaocephala inermicollis Arrow, 1914. A key to the genera and subtribes of Agaocephalini is provided.

Erioscelis emarginata (Mannerheim, 1829) is a Brazilian cyclocephaline beetle that pollinates Araceae. Here, the species is redescribed and a close relative, Erioscelis monnei sp. nov., is newly described from the Serra do Cipó region (Minas Gerais state, Brazil) based on two field expeditions to its type locality. Morphological differences were described mainly for the punctation of the abdomen and elytra, the elytral shape, as well as the male genitalia and the mouthparts. Additionally, an updated identification key for the species of the genus is provided, and a distribution map of E. emarginata is presented for the first time.

Arnaudius Grossi & Bartolozzi, 2011 is a stag beetle genus endemic to Peru, currently comprising three described species. In this study, we describe a fourth species for the genus, Arnaudius monnei Soares & Grossi sp. nov., based on two specimens collected in Machu Picchu, Peru. This new species shares all the diagnostic features of the genus, particularly those related to the male genitalia, the most unambiguous. The description of this new species calls attention to the unknown diversity of Lucanidae in the Tropical Andes, a region with high endemism, but which still remains largely undersampled. The new species is described, illustrated, and compared with the other species of the genus. Additionally, we provide an updated identification key for the males of the species of Arnaudius and a known distribution map.

The Cyclocephala castanea species group is formally delimited to include six South American species, including two here newly described: C. monnei sp. nov. from Corumbá municipality, Mato Grosso do Sul state, in the Pantanal domain, and C. figueroai sp. nov. from Iquitos province, Loreto department, Peru, in western Amazon. The other species are C. castanea (Olivier, 1789), C. hardyi Endrödi, 1975, and C. kuijteni Hielkema, 2023, from the Amazon, and C. pygidialis Joly, 2000, from Sabana province. The diagnosis for the species group is provided, along with a taxonomic key for adult males and an updated.