Descriptions of three new species of Odonata from Brazil Author Costa, Janira M. Departamento de Entomologia, Museu Nacional, Universidade Federal do Rio de Janeiro (UFRJ) BR 20940 - 040, Quinta da Boa Vista, São Cristóvão, Rio de Janeiro, RJ, Brasil. E-mail: jcosta @ globo. com. br Author De Souza, Luiz Onofre I. Departamento de Biologia / CCBS, Universidade Federal de Mato Grosso do Sul (UFMS) BR 79070 - 900, Cidade Universitária s / n, Campo Grande, MS, Brasil. E-mail: loisouza @ nin. ufms. br Author Muzón, Javier Instituto de Limnologia “ Dr. Raül A. Ringuelet ”, La Plata, Argentina. E-mail: muzon @ ilpla. edu. ar text Zootaxa 2006 2006-09-14 1314 53 68 journal article 10.11646/zootaxa.1314.1.4 2910e4d2-fd49-4368-b389-202015b74ce2 1175­5326 173923 Key to adult male Oxyagrion lacking blue spots and with dorsum of abdominal segment ten without horns 1. Dorsum of abdominal segments 8–9 black .................................................................. 4 1’. Dorsum of abdominal segments 8–9 red ...................................................................... 5 2. Dorsum of abdominal segments 7–9 black; cerci, in lateral view equal in length to paraprocts ( Fig. 7 , 9 ) ...................................................................................... O. zielmae 2’. Dorsum of abdominal segment 7 red, segments 8–10 black; cerci, in lateral view, shorter than paraproct ( Fig. 8 , 10 ) ............................................................... O. miniopsis 3. Paraprocts shorter than 1/2 length of cerci ( Fig. 11 ); apical segment of genital ligula with long lobes on segment III ..................................................................... O. rubidum 3’. Paraprocts longer than 1/2 length of cerci ( Fig. 12 ); apical segment of genital ligula with short lobes on segment III .................................................................... O. pavidum