Synopsis of Lestes from Brazil with description of Lestes demarcoi sp. nov (Zygoptera: Lestidae) Author Lencioni, F. A. A. Private researcher, Rua Anibal, 216, d. Coleginho, Vila Zezé, Jacareí, CEP (ZIP) 12310 - 780, ão Paulo, Brazil. Author Neiss, U. G. Instituto de Criminalística, Departamento de Polícia Técnico-Científica, Manaus, Amazonas, Brazil. Author Dutra, S. L. Universidade Federal do Norte do Tocantins, Laboratório de Coleções Biológicas e Paleontológicas, Biologia, Avenida Paraguai (esq. Uxiramas), Bairro Cimba, Araguaína, Tocantins, CEP 77824 -- 838, Brazil. Author Furieri, K. S. Laboratório de Ensino de Zoologia, Departamento de Ciências Agrárias e Biológicas, CEUNES, UFES, BR 101 Norte, Km 60, Bairro Litorâneo, São Mateus, CEP 29932 - 540, Espírito Santo, Brazil. Author Juen, L. Ecology and Conservation Laboratory, Instituto de Ciências Biológicas, Universidade Federal do Pará, Rua Augusto Correia, No 1 Bairro Guamá, Belém, Pará- - CEP 66.075 - 110, Brazil. Author Batista, J. D. 0000-0002-3734-6844 Entomology Laboratory of Nova Xavantina, Universidade do Estado de Mato Grosso, Nova Xavantina, Brazil. joanadarcb @ yahoo. com. br; https: // orcid. org / 0000 - 0002 - 3734 - 6844 joanadarcb@yahoo.com.br Author Vilela, Diogo S. Private researcher. Rua Jaime Bilharinho, 575, Uberaba, Minas Gerais, Brazil. text Zootaxa 2021 2021-06-22 4990 3 511 541 journal article 5561 10.11646/zootaxa.4990.3.4 e86f591b-7b3e-4002-a5e1-ddc97b53e744 1175-5326 5027008 0719C7D3-E84F-44B2-BD67-3BB61DFD7B6B Lestes undulatus Say, 1839 Fig. 13 ( ♂ —App), Fig. 25 ( ♂ —habitus), Fig. 33 ( ♀ —habitus), Fig. 37 (G— ♀ S8–10), Fig. 39 (G— ♀ basal plate), Fig. 40 (M— ♀ pectoral color pattern). Etymology : undulatus = Latin for wavy. Lestes undulatus Say, 1839: 35 (description of male); Selys 1862: 311 (description of male and female, distribution); Kirby 1890: 161 (data on species description and distribution); Calvert 1909: 104 (key, illustration of thorax in ventral view, appendages in lateral and dorsal views); Kennedy 1942: 283 (illustration of appendages in lateral and dorsal views); Davies & Tobin 1984: 34 (data on publication and distribution); Muzón 1997: 7 (larvae); Lencioni 2005: 101 , Fig. 60(A–C) (data on description, type locality, deposition, distribution, and larval description, illustration of appendages in lateral and dorsal views from Kennedy 1942 , thorax in ventral view from Calvert 1909 ); Costa et al. 2006: 60–61 , Fig. 25 (appendages lateral view, key for adult males); Garrison et al. 2010: 117 (data on species). Types . Unknown. Larva described. Yes ( Muzón 1997 ). Additional material examined. ( 2 ♂♂ + 2 ♀♀ ): 2 ♂♂ + 2 ♀♀ Argentina : Buenos Aires , Los Torinas , charco s/ Rt 11, 18.i.1995 , J. Muzón leg. Distribution. Brazil ( Rio Grande do Sul ), Uruguay , Argentina , Chile . Diagnostic characters . ♂ —Cercus in lateral view: basal 1/2 straight, slightly inclined upward, apical 1/2 comma–like with a twisted tip which is covered with pale setae; Cercus in medioventral view: basal expansion semicircular, without spines, a ridge separating the medial portion from the apical portion. Paraproct in lateral view: stout and very small (1/8 length of cercus). Paraproct in dorsal view: barely visible and slightly triangular. ♀ —Basal plate: species belonging to basal plate group 1 ( Fig. 38 ), with dorsal side more than twice the length of ventral side. Posterior side with dorsal and ventral sections subequal. Dorsal side and dorsal section of posterior side straight, ventral section of posterior side concave ( Fig. 39G ). Pectoral color pattern as in Fig. 40M .