Taxonomy of the Cixiidae (Hemiptera, Fulgoromorpha) from the Madeira archipelago Author Freitas, Énio 7D9D7B00-F712-456C-B962-9CA22F93154B University of Madeira, 9000 - 390 Funchal, Madeira, Portugal. enio.freitas@staff.uma.pt Author Aguín-Pombo, Dora 62471063-562B-407A-8781-8F6AB0635C14 University of Madeira, 9000 - 390 Funchal, Madeira, Portugal. & Centro de Investigação em Biodiversidade e Recursos Genéticos (CIBIO), Vairão, Portugal. aguin@staff.uma.pt text European Journal of Taxonomy 2021 2021-04-05 744 1 37 http://dx.doi.org/10.5852/ejt.2021.744.1295 journal article 10.5852/ejt.2021.744.1295 accc158b-4f19-427e-8b8b-6f0cd70e7b6e 2118-9773 4663771 E5B1C00A-1863-4076-8415-FE55CED1F9BA Key of Madeiran Cixiidae based on males 1. Mesonotum with 3 carinae ( Figs 4B , 7B , 9B , 10B ) ......................................................................... 2 – Mesonotum with 5 carinae ( Figs 11B , 12B , 13A ) ............................................................................ 5 2. Body length < 5 mm ; vertex tongue-shaped, posterior margin quadrangular ( Fig. 10B ); medial carina of frons smooth, reaching the posterior margin of the postclypeus ( Fig. 10A ); apical margin of tegmina oval with tubercles on the apical margin between the veins ( Figs 3E , 10I ); first metatarsus with 6 spines distally .............................................................. Tachycixius chaoensis ( China , 1938 ) – Body length> 5 mm ; shape of vertex different, posterior margin concave ( Figs 4B , 7B , 9B–D ); medial carina of frons distinctively ridged, extending along the frons and the clypeus ( Figs 4A , 7A , 9A ); apical margin of the tegmina rounded, usually without tubercles on the apical margin between veins, if present they are few ( Fig. 5A–C ); first metatarsus with 8 spines distally .......................... 3 3. Body length 5.06–5.67 mm ; light brown body ( Fig. 3A–B ); anterior margin of the vertex rounded or slightly acute, slightly concave at the back ( Fig. 9B–D ); mesonotum light brown; tegmina light golden brown, almost 2 times as long as wide, with small brown setiferous tubercles along the longitudinal veins ................................................................................... C. madeirensis China , 1938 – Body length> 5.90 mm ; light blackish to dark brown body; anterior margin of the vertex acute and posterior margin distinctively concave ( Fig. 4B , 7B ); mesonotum black; tegmina whitish, 2.75 times as long as wide, with large black setiferous points along the longitudinal veins ............................. 4 4. Body length> 7.20 mm . Vertex slightly acute at the anterior margin and concave at posterior margin ( Fig. 7B ); ventral margin of the aedeagus with a finger-shaped expansion; the largest lateral thorn curves distally forming an angle of 90º; vellum gibbous, without dorsal denticle and the ventral margin distinctively curved distally ( Fig. 7K–N ) ................................. C. verticalis Noualhier, 1897 – Body length < 7.20 mm . Vertex distinctly acute at the anterior margin and tongue-shaped at the posterior margin ( Fig. 4B ); ventral margin of the aedeagus with a wave-shaped expansion; the larger lateral thorn is curved and does not form a 90º angle distally; vellum subtrapezoid, with a small dorsal denticle and the ventral margin almost straight distally ( Fig. 4K–N ) .... C. wollastoni sp. nov. 5. Body length> 5 mm ; first metatarsus with more than 10 spines. Aedeagus with a long, hook-shaped thorn along the right lateral side and 3 smaller thorns distally on the left side of the aedeagus, two of them much longer ( Fig. 13D–E ) ....................................... Pentastiridus leporinus ( Linnaeus, 1761 ) – Body length < 5 mm ; first metatarsus with less than 10 spines. Aedeagus with two long, thin thorns on the left lateral side ( Figs 11I–M , 12I–M ) ..................................................................................... 6 6. Vertex often short, lateral margins usually converging anteriorly ( Fig. 11B ); in lateral view, dorsal thorn of aedeagus wider and longer than the ventral thorn, both converging distally ( Fig. 11I–M )... .................................................................................................... H. madeires Remane & Hoch, 1986 – Vertex often long, lateral margins usually parallel ( Fig. 12B ); in lateral view, dorsal thorn of aedeagus more slender and shorter than the ventral thorn, both distally parallel or divergent ( Fig. 12I–M ) .... ............................................................................................... H. portonoves Remane & Hoch, 1986