Revisionary notes on the genus Adelungia Melichar, 1902 (Hemiptera: Cicadellidae, Megophthalminae), with the description of a new genus.

Leafhopper genus Adelungia Melichar, 1902 is reviewed. Spathicerula Gnezdilov gen. nov. is described with Adelungia calligoni Oshanin, 1908 as the type species, and a new combination-Spathicerula calligoni (Oshanin, 1908), comb. nov., is proposed. Adelungia tridigitata Dlabola, 1984 is placed in synonymy under A. calligoni. Lectotypes are designated for Adelungia elegans Melichar, 1902 and A. breviceps Kusnezov, 1931 to stabilize the nomenclature in the group according to the International Code of Zoological Nomenclature.

Revisionary notes on the genus Paraphysifer Sinaiko & Dietrich, 2020 (Auchenorrhyncha: Cicadellidae: Deltocephalinae).

The monotypical genus Paraphysifer Sinaiko & Dietrich, 2020 is revised. The type species of the genus, Paraphysifer wilsoni Sinaiko & Dietrich, 2020, is placed in synonymy under Psammotettix pictipennis (Kirschbaum, 1868), with a new combination proposed-Paraphysifer pictipennis (Kirschbaum, 1868), comb. n. Psammotettix narsikulovi Dlabola, 1960, P. salsuginosus Logvinenko, 1961, and P. perpictus Logvinenko, 1978 are transferred to the genus Paraphysifer with new combinations proposed-Paraphysifer narsikulovi (Dlabola, 1960), comb. n., P. salsuginosus (Logvinenko, 1961), comb. n., and P. perpictus (Logvinenko, 1978), comb. n. Key to species of Paraphysifer given. Relationships of Paraphysifer and Psammotettix Haupt, 1929 are discussed.

Family Nogodinidae (Hemiptera: Fulgoroidea) from the Canary Islands, with the description of a new species of the genus Morsina Melichar, 1902.

Planthopper family Nogodinidae is recorded for the first time from the Canary Islands after a new species, Morsina gomerae sp. nov., described from the dry landscapes of La Gomera island. Mikewilsonia Holzinger, 2019 is placed in synonymy under Morsina Melichar, 1902. Mikewilsonia kunzi Holzinger, 2019 is transferred to Morsina with a new combination proposed-Morsina kunzi (Holzinger, 2019), comb. nov.

A new species of the genus Cheiloceps Uhler, 1895 (Hemiptera: Fulgoromorpha: Issidae) from the Dominican amber.

A new species of the planthopper genus Cheiloceps Uhler, 1895 (Issidae, Issinae, Thioniini), Cheiloceps magnifrons sp. nov., is described from the Dominican amber. Issidae fossils are briefly discussed.

A new species of the genus Paranataretus El-Sonbati, 2023 (Hemiptera: Cicadellidae: Deltocephalinae) from the continental Africa.

A new species of the leafhopper genus Paranataretus El-Sonbati, 2023, P. albertinus sp. n., is described from North Kivu Province of the Democratic Republic of Congo which is first record of the genus from Africa. New records from Madagascar is given for Paranataretus brevis (Gnezdilov, 2020). Relationships of the species within the genus Paranataretus are discussed.

Revision of the genus Lethierium Dlabola, 1980 (Hemiptera: Auchenorrhyncha: Issidae), with description of two new species from Central Morocco.

North-African planthopper genus Lethierium Dlabola, 1980 is revised. Lethierium cedricolum (Dlabola, 1989), L. juniperi (Bergevin, 1915), and L. reiberi (Lethierry, 1878) are redescribed, with new records provided. Two new species are described from Central MoroccoL. carinatum sp. nov. from Middle Atlas Mountains and L. grandilobum sp. nov. from High Atlas Mountains. L. juniperi is recorded for the first time from Morocco. A key to species of the genus is provided. The phylogenetic relationships of Lethierium Dlabola within the subfamily Hysteropterinae are discussed.

Leafhoppers of the tribe Adelungiini (Auchenorrhyncha: Cicadellidae: Megophthalminae) in Iran.

The study is focused on the leafhopper tribe Adelungiini (Megophthalminae) of Iran and based on the specimens collected since 1970s to 2018 and deposited in the Hayk Mirzayans Insect Museum, Iranian Research Institute of Plant Protection, Teheran (Iran) and in the Zoological Institute of the Russian Academy of Science, Saint Petersburg (Russia). Achrus caligonicolus Dlabola, 1981 and Achrus taghizadehi Dlabola, 1981 are placed in synonymy under Achrus albicosta (Kusnezov, 1929) and Melicharella pascualis Dubovsky, 1968 is placed in synonymy under Melicharella basalis Dlabola, 1960. Five species: Dalus leopardinus (Haupt, 1917), Melicharella basalis Dlabola, 1960, Platyproctus agraphopteron Bergevin, 1932, P. omani (Kameswara Rao et Ramakrishnan, 1983), and Zubara lycii Al-ne'ami et Linnavuori, 1982 are recorded for the first time from Iran, representing three new generic records from the country. Male genitalia of D. leopardinus and Adelungia elegans Melichar, 1902 are illustrated here for the first time. A revised checklist of Adelungiini of Iran, with a key to species and maps of their distribution are provided.

A new species of the genus Grammacephalus Haupt (Hemiptera: Auchenorrhyncha: Cicadellidae: Deltocephalinae) from the United Arab Emirates, with a key to species of the genus known from the Arabian Peninsula.

Grammacephalus albatus sp. nov. is described from Wadi Wurayah National Park in Fujairah Emirate of the United Arab Emirates. A key to five species of Grammacephalus known from the Arabian Peninsula is given. Notes on relationships of Grammacephalus Haupt, 1929 and Bampurius Dlabola, 1977 are given, with the taxonomic position of Grammacephalus genoicus Dlabola, 1984 discussed.

Review of the genus Cavatorium Dlabola, 1980 (Hemiptera: Auchenorrhyncha: Issidae), with description of a new species from Iran.

Examination of the materials on Cavatorium dumetorum (Dlabola, 1981), including the type specimens, revealed that Dlabola (1981) based his description of this species on mixed type series. C. dumetorum sensu stricto is clearly distinguished by male anal tube with latero-apical processes and ventral phallobase lobe narrowing apically. Another species, externally close to C. dumetorum, but well recognized by male anal tube without processes and ventral phallobase lobe not narrowing apically, is described as new basing on the paratypes of C. dumetorum and other material available. C. dumetorum is re-described and a key to species of the genus is provided.

A new species of the genus Cylindratus Meng, Qin et Wang, 2020 from northern Vietnam, with first description of 5th instar larva and a key to Vietnamese Caliscelini (Hemiptera: Fulgoromorpha: Caliscelidae).

Cylindratus fansipan sp. nov. is described from Lao Cai Province of Northern Vietnam. It is the first record of the genus Cylindratus Meng, Qin et Wang, 2020 from Vietnam and the fourth genus of the subfamily Caliscelinae known from the country. A 5th instar larva of the genus Cylindratus is described and illustrated for the first time. A key to the Vietnamese Caliscelini is given.

A new species of the genus Mycterodus Spinola (Hemiptera: Auchenorrhyncha: Issidae) from Iran defining southern boundary of generic distribution.

Mycterodus meridionalis sp. n. is described from Kerman Province of southern Iran. This is one of the most southern species of the genus Mycterodus Spinola known from between 29º and 30º of northern latitude.

First record of the leafhopper tribe Adelungiini Baker (Hemiptera, Auchenorrhyncha, Cicadellidae: Megophthalminae) from Turkey, with notes on emAchrus/em emalbicosta/em (Kusnezov, 1929).

The tribe Adelungiini Baker, 1915 is recorded for the first time from Turkey and the genus Achrus Lindberg, 1925 is recorded for the first time from China based on Achrus albicosta (Kusnezov, 1929) collected by Kozlov's Mongol-Sichuan expedition in Inner Mongolia at the beginning of last century and recently-in Eastern Anatolia, Elazig Province. New locality records as well as illustrations of external view and male genitalia structures for A. albicosta are given from Mongolia, Kazakhstan, Turkmenistan, Uzbekistan, and Iran.

A peculiar new species of the genus Grammacephalus Haupt (Hemiptera: Auchenorrhyncha: Cicadellidae: Deltocephalinae) from Madagascar.

Grammacephalus brevis sp. n. is described from the Makay Massif in the former Toliara Province of Madagascar which is first record of the genus from the island. The species described is peculiar by its short vertex and demonstrates close relationships of Grammacephalus Haupt and Scaphoidophyes Kirkaldy. The characters of Grammacephalus Haupt, Scaphoidophyes Kirkaldy, Capoideus Theron, 1974, Nataretus Theron, 1980, and Platyretus Melichar are discussed.

First record of the genus Korana Distant, 1910 (Hemiptera, Auchenorrhyncha, Cicadellidae: Deltocephalinae) from Eurasia.

Korana rorulenta (Stål, 1855) is recorded for the first time from the United Arab Emirates and Iran. Phlepsius isinus Dlabola, 1979 is placed in synonymy under K. rorulenta. Photos of external view and drawings of male genitalia for K. rorulenta are provided.

Three new species of the genus Tartessus Stål (Hemiptera: Cicadellidae: Tartessinae) from Vietnam.

Three new species of the genus Tartessus Stål,  1865 are described from Vietnam: T. kabakovi sp. n.-from Vinh Phuc Province; T. nigriventris sp. n.-from Gia Lai Province; T. iridescens sp. n.-from Ðong Nai and Bà Ria-ung Tàu Provinces. These are first records of the subfamily Tartessinae from the country. T. malayus (Stål, 1859) is recorded and illustrated from Taiwan.

On the genera Issidius Puton and Morsina Melichar (Hemiptera: Auchenorrhyncha: Fulgoroidea: Nogodinidae: Epacriini).

Nogodinid genera Issidius Puton, 1898 and Morsina Melichar, 1902 are revised. Iranissus Dlabola, 1980 is placed in synonymy under Issidius Puton and Hadjia Dlabola, 1981, Philbyella China, 1938 and Rileyopsis Bergevin, 1917-under Morsina Melichar. Philbyella adeiba Badawy, El Hamouly et Sawaby, 2011 is placed in synonymy under Ph. elba Linnavuori, 1973. The lectotypes are designated for Issus rotundiceps Lethierry, 1887 and Morsina persica Melichar, 1902. The photos of type specimens of Morsina persica Melichar, 1902, Hadjia quadrifasciata Dlabola, 1981, and H. nerii Dlabola, 1981 are given.

On the taxonomic position of the genera Krundia, Breukoscelis, and Uphodato (Hemiptera, Auchenorrhyncha, Fulgoroidea) described from the Insect Limestone of the Isle of Wight.

Three fossil genera, Krundia Szwedo, 2019, Breukoscelis Szwedo, 2019, and Uphodato Szwedo, 2019, described in the family Issidae are transferred to other families according to the shape and venation of forewings. Krundia Szwedo is transferred to the family Tropiduchidae. Breukoscelis Szwedo is placed in synonymy under Uphodato Szwedo and transferred to the family Cixiidae. Forewing venation of the members of Issidae, Tropiduchidae, and Cixiidae are discussed and illustrated.

New records for the genus Issus Fabricius (Hemiptera: Auchenorrhyncha: Fulgoroidea: Issidae) from northern Africa and Spain.

Issus kabylicus Dlabola, 1989 is recorded for the first time from Tunisia and I. vaucheri Gnezdilov, 2017 - from Spain. I. kabylicus is redescribed and illustrated. Male and female genitalia of I. coleoptratus (Fabricius, 1781) are described and illustrated based on the specimens from Germany (type locality). Relationships of African Issus species are discussed. Close relationships of I. climacus Fieber, 1876 to Madeiran and Canarian Issus species are revealed.

To the revision of the genus Thionia Stål (Hemiptera, Fulgoroidea, Issidae), with description of new genera and new subtribe.

New subtribe, Oronoquina subtrib. n., is erected for the genus Oronoqua Fennah, 1947 in the tribe Thioniini Melichar. New genera, Fowlerium gen. n. (type species: Thionia naso Fowler, 1905) and Aplos gen. n. (type species: Issus simplex Germar, 1830) are erected in the subtribe Thioniina Melichar. Thionia acuta Doering, 1941 and T. producta Van Duzee, 1908 are transferred to Fowlerium gen. n. The photos of type specimen of Issus cinctifrons Stål, 1854 are examined and compared with original description of Issus rubrocostatus Spinola, 1839 (currently Thionia rubrocostata (Spinola, 1839)). I. cinctifrons is reinstalled from synonymy with I. rubrocostatus as Thionia cinctifrons (Stål, 1854). Diagnosis of Thionia sensu stricto is given basing on the characters of T. cinctifrons. Generic status of Cheiloceps Uhler, 1895 is discussed and confirmed. Thionia argo Fennah, 1949, T. anguillana Fennah, 1965, T. borinqueta Caldwell et Martorell, 1951, and T. puertoricensis Caldwell et Martorell, 1951 are transferred to the genus Cheiloceps Uhler. Hind wing venation characters of Issidae are discussed.

The mythic species Issus analis Brullé, 1833 (Hemiptera, Fulgoroidea, Issidae): still an enigmatic taxon.

One Issidae specimen stored in Paris museum historical collections is reported as holotype of Issus analis Brullé, 1833. From the original description, which is confirmed by study of this specimen, the species is moved to the genus Zopherisca Emeljanov, 2001 under a new combination Zopherisca analis (Brullé, 1833), comb. n. Date of description is discussed and modified from 1832 to 1833 accordingly. Unfortunately being a female as type specimen, the species remains quite enigmatic until some molecular analsysis could be undertaken on this old material.