The densimacularis species group of the genus Promalactis Meyrick, 1908 is proposed based on the forewing patterns. These species are diagnostic by the forewing having three black patches on the costal margin, the gnathos usually with a membranous apical process in the male genitalia, and the ductus bursae with denticles or spines in the female genitalia. Four new species are described P. costispinata sp. nov., P. trimaculata sp. nov., P. simingshana sp. nov. and P. yongjiana sp. nov. All the 14 described species of the densimacularis-group are listed. Photographs of adults and genitalia of the new species are provided.The subfamily Melolonthinae (Coleoptera Scarabaeidae) is defined and characterized, and a brief summary of the world melolonthine tribes and their distributions are provided. Nearctic genera previously considered incertae sedis (Acoma Casey, 1889, Chaunocolus Saylor, 1937 and Chnaunanthus Burmeister, 1844, Phobetus LeConte, 1856, and Warwickia Smith Evans, 2005) are each placed in the proposed new tribes Acomini, Chnaunanthini, Phobetusini, and Warwickiini, respectively. Tribal assignments for all Nearctic melolonthine genera are presented. Acoma chihuahuaensis, A. eusexfoliata, A. nonglabrata, and A. pararobusta are all new species described from Mexico. The only known example of a female Acoma, represented by a specimen of A. knulli Howden, 1958, is figured and characterized. The generic composition of the Nearctic Melolonthini and Rhizotrogini is examined. Madiniella Chalumeau Gruner, 1976, previously placed in Tanyproctini, is transferred to Rhizotrogini. The subfamilies Oncerinae and Podolasiinae are each removed as tribes from the Melolonthinae and elevated to the subfamily level within Scarabaeidae. The subtribe Triodonina is placed in synonymy with the tribe Rhizotrogini. An updated generic checklist and tribal key of the Nearctic Melolonthinae are provided.The paper reports 2 new species of the genus Xizicus Gorochov, 1993 from Gaoligongshan, Yunnan, China, i.e. Xizicus (Axizicus) furcus Cui, Liu Shi sp. nov. and Xizicus (Eoxizicus) gaoligongshanensis Cui, Liu Shi sp. nov., and supplies characteristic photographs of external morphology. Besides, morphological illustrations of Xizicus (Eoxizicus) kulingensis (Tinkham, 1943) are provided. The type specimens are deposited in the Museum of Hebei University, Baoding, P. R. China.Species traditionally considered to belong to Eunice are now, also, distributed in two other genera Leodice and Nicidion recently resurrected to reconcile Eunicidae taxonomy with its phylogenetic hypothesis. In Australia, Eunice species have been reported from all seas and sum up to 22 species. In this study, we propose 10 new combinations for traditional Eunice species, which should be moved to Leodice; describe seven new species, four of Eunice and three of Leodice; and comment on species previous recorded from the Australian Coast. Previous records of E. denticulata, E. filamentosa, E. grubei, E. indica, E. longicirris, E. microprion, E. paupera, E. tridentata, E. tubifex and E. vittata from Australia are considered dubious. Eunice tribranchiata, originally described from Australian specimens, is considered here to be an indeterminable species. This study also includes descriptions of Eunice, Leodice and Nicidion as well as key to these genera and their species recorded from Australia.The coniopterygid fauna of the Neotropical region is poorly known. The most recent summary was provided by Martins (2019) who noted that 14 species were known from Peru. The subgenus Coniopteryx (Scotoconiopteryx) is endemic to the Neotropical region and comprises 36 species (Meinander 1972; Meinander Penny 1982; Sziráki 2011; Martins Amorim 2016, Sarmiento-Cordero Contreras-Ramos 2019).The new species from Mindanao (the Philippines) Thopeutica (s.str.) wiesneri sp. nov. is described. The new species is compared with T. (s.str.) angulihumerosa (W. Horn, 1929). The study of type material allowed to establish the new synonymy T. (s.str.) juergenwiesneri Schüle, 2017 syn. nov. = T. (s.str.) angulihumerosa (W. Horn, 1929). Illustrations of the habitus and diagnostic characters are provided.Aphelonotus schuhi sp. nov. (Hemiptera Heteroptera Pachynomidae Aphelonotinae) is described from Puerto Rico based on a single male collected by flight interception trap. The new species is morphologically similar to A. taino Schuh, Weirauch Grillo, 2015 and A. xenos Schuh, Weirauch Grillo, 2015, being distinguished from them by the combination of the presence of a stout subapical spine on the protibia and the characteristic shape of the parameres. An informal A. xenos species-group is proposed to accommodate these three species.Material collected by the Norwegian Scientific Expedition to Tristan Da Cunha in the South Atlantic Ocean in the years 1937-1938 and later attributed by Stephensen, 1949 to Orchestia scutigerula Dana, 1852 has been re-examined and is described as a new genus and species, Gondwanorchestia tristanensis sp. nov. Orchestia scutigerula Dana, 1852 is transferred to Gondwanorchestia gen nov. and compared with G. tristanensis sp. nov.Larva and pupa of Phylloicus obliquus Navás are associated, described, illustrated and compared with other Neotropical species of the same genus. The P. PF-06821497 obliquus larva differs from the others due to the pattern of distribution of muscle scars on the head, mandibles with two teeth, and a dense row of long yellow setae on the inner margin. The pupa differs from other Phylloicus pupae by the sequence and shape of tergal abdominal hook plates. The case of P. obliquus larvae is composed of rectangular fragments of vegetal material with uniform shape and always arranged in overlapping layers. Larvae were found in a small second order Atlantic Forest stream.This publication revises the taxonomy of the leaf beetle genus Exomis Weise, 1889 (Coleoptera Chrysomelidae Clytrini) which is endemic to China. Six new species are described E. deqinensis sp. nov., E. huangi sp. nov., E. pubescens sp. nov., E. pubipennis sp. nov., E. tanae sp. nov. and E. viridis sp. nov., in addition to two known species, namely E. degenevei Pic, 1932 and E. peplopteroides Weise, 1889. Exomis oblongum (Lopatin Konstantinov, 2009) from China (Yunnan) is transferred to this genus as new combination. The total Chinese fauna of Exomis is thus increased to nine species. A key to these species is provided and, for each of them, also a color photo of habitus and line drawings of the aedeagus, spermatheca and kotpresse, in order to ease identification in the future.