This preface provides a summary of the scientific and didactic accomplishments of prominent Polish entomologist Prof. Lech Borowiec (University of Wrocław).

Three new genera of thiratoscirtines are established: Finger gen. nov., Lictor gen. nov. and Quadrica gen. nov. Six new species are described: Bacelarella machadoi sp. nov. (♀, from Angola), Finger chitato sp. nov. (♀, from Angola), Finger lechi sp. nov. (♂♀, from Angola), Lictor tchimbele sp. nov. (♂, from Gabon), Thiratoscirtus obesus sp. nov. (♀, from Gabon) and Thiratoscirtus tenuis sp. nov. (♂, from Gabon, Mozambique, Burundi and Uganda). Six new combinations are proposed, two ex Bacelarella: Lictor conjugans (Szűts & Jocque, 2001) comb. nov. and Lictor pavidus (Szűts & Jocqué, 2001) comb. nov. and four ex Thiratoscirtus: Lictor mirabilis (Wesołowska & Russell-Smith, 2011) comb. nov., Lictor perspicuus (Wiśniewski & Wesołowska, 2013) comb. nov., Lictor tentativus (Szűts & Jocque, 2001) comb. nov. and Quadrica lamboji (Seiter & Wesołowska, 2015) comb. nov. Female of Bacelarella pavida Szűts & Jocqué, 2001, wrongly matched with a male of Thiratoscirtus gambari Wesołowska & Russell-Smith, 2011, is returned as female of Lictor pavidus (Szűts & Jocqué, 2001). The utility of female palp spination in taxonomy of thiratoscirtines is discussed.

A new apionine genus and species, Diselmobius lechi, is described from Tasmania, based on four females collected on the Cupressaceae Diselma archeri Hooker in Cradle and Field Mountains. It represents the fourth distinct apionine lineage in the fauna of Australia, being compared with the Australian Rhinorhynchidius Voss and New Zealand Strobilobius Kuschel, both associated with the gymnosperm family Cupressaceae. Due to unknown male characters, the tribal placement of Diselmobius within Apioninae remains uncertain.

The occurrence of the genus Charaea Baly, 1878 is confirmed on the islands of Java, Bali and Borneo (Indonesia, Malaysia). Cynorta abdominalis Jacoby, 1891 from Java and Bali is transferred to Charaea and the new replacement name Ch. fruhstorferi nom. nov. is proposed for it due to homonymy with Charaea abdominale (Jacoby, 1890) from China (Hubei). The position of Cneorane abdominalis Jacoby, 1890 in Charaea is confirmed. Charaea borowieci sp. nov. from Java, Ch. bryanti sp. nov. and Ch. sarawakense sp. nov., both from Malaysia (Sarawak), are described. All species are photographed and compared with related species. Charaea merahkupak Takizawa, 2017 from Malaysia (Sabah) is not congeneric with Charaea. Currently, its correct assignment is unknown and the species is still formally classified in Charaea.

Two new species of Shairella are described: S. borowieci sp. nov. (China) and S. hsiehae sp. nov. (Taiwan). Shairella borowieci sp. nov. is the first species outside Taiwan, where all previously known species are found. It is the species with fully developed wings and capable of flight. Generic delimitation is re-evaluated and a transformation of character states is hypothesized, from normal hindwings to shortened elytra and reduced hindwings. An updated key to all known species of Shairella is provided.

Calotheca is a species-rich sub-Saharan flea beetle genus with many undetermined specimens that are currently being studied. We here describe two new species from southern Africa: Calotheca borowieci sp. nov. from Zimbabwe, and C. orophila sp. nov. from KwaZulu-Natal in the Republic of South Africa. They show the greatest similarity to one another and, to some extent, to Calotheca marmorata (Baly). Photographs of the main diagnostic characters are provided for these new species, and for C. marmorata, which include the habitus, median lobe of the aedeagus, and spermatheca. Information on their geographic distribution and host plants are also reported.

Immature stages of Cassida koreana Borowiec et Cho, 2011 are described in detail for the first time and compared with its closely related species, C. vespertina Boheman, 1862. Line drawings, chaetotaxy, live photographs, and SEM photos of morphological details are provided.

The Acolastus ornatipennis species-group is revised. Two new species from Namibia are described, i.e. Acolastus borowieci sp. nov. and A. namibianus sp. nov. The new species are illustrated and a key to species is provided. Based on the records available, the A. ornatipennis species-group is endemic to Namibia. Including these two new species 10 species of Acolastus are currently known from Namibia.

Eleven new species of tortoise beetles (Chrysomelidae: Cassidinae s.str.) are described from Madagascar: Androya borowieci sp. nov., Cassida borowieci sp. nov., C. donaldi sp. nov., C. jirka sp. nov., C. jolantae sp. nov., C. katka sp. nov., C. kuglerovae sp. nov., C. lechi sp. nov., C. matyasi sp. nov., C. sipovae sp. nov., and C. vlasta sp. nov. All species are provided with colour photographs and detailed diagnosis.

Gonioctena borowieci sp. nov. is described from Vinh Phuc province, Vietnam. Gonioctena jolantae Cho, 2022 originally described from Laos is found in Houaphanh province, Vietnam. They represent the first record of the nominotypical subgenus Gonioctena from Vietnam. DNA barcode sequences of both species are obtained and deposited in GenBank. A key to all the known Vietnamese species of the genus Gonioctena is provided.

Taxonomic and nomenclatural changes in African Galerucinae are explicated. Pteromahutia borowieci gen. nov., sp. nov. is described. The authorship and status of Sesselia flavicincta (Jacoby, 1899) are clarified. Additional information on the distribution of some other African species is presented.

We applied whole genome shotgun sequencing to museum specimens of longhorn beetles, and reconstructed the phylogenetic relationships of Australian Prioninae using mitochondrial protein-coding genes. Based on the molecular phylogeny and morphological characters, we suggest downgrading the subfamily Parandrinae Blanchard to the tribe Parandrini in the Prioninae Latreille and synonymise Erichsoniini Thomson with Parandrini Blanchard. Australian Prioninae are classified in seven tribes: Catypnini Lacordaire stat. rev., Macrotomini Thomson, Osphryonini trib. nov., Parandrini Blanchard, Rhipidocerini trib. nov., Sceleocanthini Lacordaire stat. rev., and Tereticini Lameere. Tribal compositions and generic relationships are tested, and the subtribal divisions within the large tribe Macrotomini are briefly discussed.

The phylogenetic placement of the enigmatic subtribe Stenolamina is investigated based on the analysis of four molecular loci (CAD, wg, 28S, 12S). Historically, the position of Stenolamina remained unfixed, and was listed as incertae sedis within the darkling beetle subfamily Blaptinae. Molecular data render Stenolamina as a separate lineage within the tribe Opatrini. The morphology and distribution of Stenolamina are reexamined. Scanning electron microscopy revealed that Stenolamina shares the synapomorphic Opatrini protrochanter structure seen in all other members of the tribe. Furthermore, unique antennal sensoria (placoid / stenolamoid) are reported for Stenolamina – this feature is distinct from all other Blaptinae. This paper presents the first morphological definition of Stenolamina. Finally, Stenolamus borowieci sp. nov. is described from the surroundings of Port Nolloth (South Africa). The material examined for this species displayed a striking type of sexual dimorphism, which is omnipresent within Stenolamina (females with acute basal angles of the pronotum).

A new genus and species of the tribe Amarygmini (Coleoptera: Tenebrionidae), Laocnemis gen. nov. borowieci sp. nov., is described from Laos. The newly discovered taxon is characterised by broad elytra, armed profemora, medial contact of the eyes on the frons, keel-like elevated genae, rectangular and not projecting posterior angles of the pronotum, keeled elytral intervals, and broad and short tibiae each with external furrow. Additionally, Termitocnemis huangi Jiang, Song, He, Engel, and Wang, 2021, described from Fujian (China), is recorded from Yunnan (China) and Laos for the first time.

A newly discovered species, Archaeoglenes borowieci sp. nov., is illustrated and described from the Moluccas (Indonesia). This new taxon is the first known anophthalmic representative of the genus. Based on the structure of the mouthparts (transverse mentum with truncate anterior margin; triangular and narrow submentum), pronotum (simple, without incision before anterior angle), and abdomen (wide and truncate intercoxal process), it is classified within the newly designated Archaeoglenes biroi species-group, which also groups: A. biroi Kaszab, 1982, A. caledonicus Kaszab, 1982, A. lawrencei Kaszab, 1982, A. solomonensis Lawrence, 1979, A. triplehorni Iwan & Kamiński, 2015. Additionally, the following synonymy is introduced: Archaeoglenes solomonensis Lawrence, 1979 (=Archaeoglenes greensladei Kaszab, 1982 syn. nov.).

The Neotropical Prionocyphon is revised. Cyphon obscurus coccinelloides Pic is elevated to a species level and transferred to Prionocyphon. Prionocyphon auritus Champion, P. coccinelloides (Pic), P. major Pic, P. pilicornis Champion, and P. pubescens Pic are redescribed and illustrated. Nine new species are described: Prionocyphon borowieci sp. nov. (Ecuador), P. championi sp. nov. (Guatemala), P. costaricanus sp. nov. (Costa Rica), P. crassicornis sp. nov. (Bolivia), P. inca sp. nov. (Peru), P. lescheni sp. nov. (Ecuador), P. lyra sp. nov. (Brazil), P. meridensis sp. nov. (Venezuela), and P. napoensis sp. nov. (Ecuador). Prionocyphon minutus Pic, and P. vicinus Pic do not belong to Prionocyphon in the present sense. New records of P. coccinuloides Klausnitzer, P. muchei Klausnitzer, and P. samueli Klausnitzer are reported. Notes on morphology of Prionocyphon are provided.

The revision of the populations of ants of the genus Proformica in Greece recently led to the discovery of two new endemic species: Proformica chelmosensis Lebas & Galkowski, 2019, and Proformica lebasi Borowiec & Salata, 2022. With these descriptions, the number of Proformica species in Greece increased to four. The description of a new species, Proformica borowieci sp. nov., found on Mount Parnassus in Central Greece is presented in this article. Its characters make it a sister species to P. chelmosensis from the northern Peloponnese. Its name honours the immense work of Lech Borowiec in studies on the myrmecofauna of Greece. The morphological characteristics and those related to cuticular hydrocarbons of this new species are examined.