Morphology of the external scent efferent system of Neotropical shield bugs (Hemiptera: Scutelleridae: Pachycorinae) Author Weiler, L. Programa de Pós-Graduação em Biologia Animal, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, Porto Alegre, RS 91501 - 970, Brazil & Evolution and Ecology Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney 2052, Australia weiler.luciana@gmail.com Author Barão, K. R. Programa de Pós-Graduação em Biologia Animal, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, Porto Alegre, RS 91501 - 970, Brazil & Departamento de Zoologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil Author Cassis, G. Evolution and Ecology Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney 2052, Australia Author Grazia, J. Programa de Pós-Graduação em Biologia Animal, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, Porto Alegre, RS 91501 - 970, Brazil text Zoomorphology 2016 2016-11-01 136 1 16 journal article 24180 10.1007/s00435-016-0330-y 0443e804-fe76-4832-b0a1-4feb573ed492 3636721 Chelyschema trinotata (Walker) Ostiole closer to metacoxal cavity than to lateral margin of metapleuron ( Fig. 7a ); ostiole guttiform, oriented ventrolaterally, visible in lateral view; lateral and posterior margins of ostiolar plate elevated; peritreme reduced, directed laterally ( Fig. 7b ), median furrow obsolete; peritremal surface smooth ( Fig. 7c ). Evaporatorium well developed on meso- and metapleuron; on metapleuron, evaporatorium covering most of ostiolarplateandreachingbetweencoxalcavities, outermargin of metapleural evaporatorium convex; on mesopleuron, well developed on mesepimeron; evaporatorium with several minute sensilla ( Fig. 7d ); mushroom bodies irregular, alveoli with several trabeculae. Metathoracicspiracle wide; metapleural margin of spiracle with several setae; processes of the filter system of irregular diameter, processes spiny ( Fig. 7e ).