Taxonomic revision of the Neotropical leafhopper genus Barolineocerus Freytag, 2008 (Hemiptera: Cicadellidae: Eurymelinae: Chiasmodolini), with descriptions of three new species and an updated key to species Author Praciano, Daniel Lucas Programa de Pós-Graduação em Biodiversidade e Biologia Evolutiva, Universidade Federal do Rio de Janeiro. CAPES doctoral fellow & Laboratório de Entomologia, Departamento de Zoologia, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Caixa Postal 68044, Rio de Janeiro, 21941 - 971, RJ, Brazil Author Dietrich, Christopher H. 0000-0003-4005-4305 chdietri@illinois.edu Author Takiya, Daniela Maeda Laboratório de Entomologia, Departamento de Zoologia, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Caixa Postal 68044, Rio de Janeiro, 21941 - 971, RJ, Brazil text Zootaxa 2025 2025-06-30 5653 4 451 485 https://doi.org/10.11646/zootaxa.5653.4.1 journal article 311559 10.11646/zootaxa.5653.4.1 9327f603-3ad4-499b-afe2-5867ec5eeab5 1175-5326 15821816 1F47BA17-718C-40E5-A5A3-4076C12E69C5 Barolineocerus furcatus Freytag, 2008 ( Figs. 1P–S , 15A–N) Barolineocerus furcatus Freytag, 2008: 55 , figures 7, 26–28. Type locality: Reserva Natural Mosiro-Itájura (Caparú), Igapo , Vaupés , Colombia . Diagnosis (based on material identified by P. Freytag, deposited in FSCA and UKIC). Pronotal macula extends to hind margin of pronotum ( Fig. 1P ). Claval macula extends to or slightly beyond scutellum apex ( Fig. 1P ). Abdominal sternite II apodeme extending beyond posterior margin of sternite III ( Fig. 15B ). Pygofer posterior margin without ventral process; with short median process; apex bifurcate and pointed ( Fig. 15C–E ). Valve with posterior margin convex ( Fig. 15F ). Subgenital plate without dorsal process; bluntly pointed apex ( Fig. 15G ). Aedeagus with dorsal median process; with pair of preapical lateral rounded processes ( Fig. 15L ). Measurements (mm). Males (n= 2), total length (to apex of forewing): 3.99; median length of crown: 0.17; length of crown close to eyes: 0.17; width of head: 1.45; width of crown between eyes: 0.90; length of pronotum: 0.54; length of scutellum: 0.87; width of pronotum: 1.37; width of scutellum: 1.04; length of face: 0.89; width of face between eyes: 0.87; distance between ocelli: 0.31; ocellocular distance: 0.24; length of clypeus: 0.33; basal width of clypeus: 0.18; apical width of clypeus: 0.31; length of forewing: 3.41. Distribution. Brazil ( Rondônia ); Colombia ( Vaupés ). Additional material. Brazil: 1♂ , “ BRAZIL : Rondônia 62\ km SW Ariquemes, nr [near]\ Fzda [ Fazenda ], Rancho Grande \ 4–16-XI-1997 JE Eger\ MV & UV Lights”, “ Barolineocerus \ furcatus\ Freytag\ Det. [Determined by] Freytag 2006”, FSCA . 1♂ , 1♀ , same data as preceding, UKIC . Remarks. Freytag (2008) provided illustrations of the male genital capsule (lateral view), subgenital plate (ventral view), connective, style and aedeagus (ventral view), and undissected female terminalia (ventral view) of B. furcatus . Specimens of B. furcatus identified by P. Freytag in 2006, deposited in FSCA and UKIC and studied herein indicate that his original illustrations of the preapical processes on aedeagus are slightly inaccurate. In lateral view, the process appears rounded rather than pointed ( Fig. 15L ). The pointed aspect is only visible from the posterior view due to the position, orientation, and shape of the process ( Fig. 15M–N ). The bifurcate process on the pygofer posterior margin has both ends pointed ( Fig. 15E ). The male hind tibia AD row has 5–7 cucullate setae and in PD row with 16–20 cucullate setae. Barolineocerus furcatus shares similarities with B. chiasmus , B. ornatus , B. chicomendesi sp. nov. , B. dercyae sp. nov. , and B. digitatus sp. nov. , as mentioned earlier. This species is very close to B. dercyae sp. nov. , as mentioned earlier. However, B. furcatus differs in having the median pygofer process bifurcate ( Fig. 15E ) and the subgenital plate apex bluntly pointed ( Fig. 15G ).