Revision Of Brachystethus (Heteroptera, Pentatomidae, Edessinae) Author Barcellos, Aline Museu de Ciências Naturais, Fundação Zoobotânica do Rio Grande do Sul, Caixa Postal 1188, 90001 - 970, Porto Alegre, RS, Brazil. alinebar@ig.com.br Author Grazia, Jocélia Departamento de Zoologia, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, Prédio 43435.2, 91501 - 970, Porto Alegre, RS, Brazil. jocelia@ufrgs.br text Iheringia, Sér. Zool. 2003 2003-12-30 93 4 413 446 journal article 10.1590/S0073-47212003000400008 32bd22ce-7d3f-4eac-8203-e9f61a19c7f0 1678-4766 3719467 Key to the species of Brachystethus 1. Metasternal carina, in profile, strongly elevated anteriorly.....................................................2 Metasternal carina, in profile, flat or little elevated anteriorly................................................ 7 2. Pronotum with a yellowish sub-callous border....................................................................... 3 Pronotum without a yellowish sub-callous border..................................................................5 3. Venter with longitudinal series of yellowish spots. Fourth antennal segment medially swollen.. ........................................................................................................... B. cribrus (Fabricius) Venter uniformly castaneous to dark-castaneous, lacking yellowish spots. Fourth antennal segment cylindrical............................................................................................................ 4 4. Lobes of dorsal rim of pygophore projected, well developed (fig. 22). Posterior borders of gonocoxites 8 sinuate, not projected over laterotergites 8 (fig. 63)...................................... ......................................................................................................... B. improvisus Breddin Lobes of dorsal rim of pygophore scarcely projected (fig. 23). Posterior borders the gonocoxites 8 projected in acute angle, over laterotergites 8 (fig. 64)........................ B. vicinus Signoret 5. Hemelytra with a small yellowish callus, near and entad to apex of radial vein............................ ............................................................................................................... B . schuhi , sp. nov. Hemelytra without callus........................................................................................................ 6 6. Apex of femora and base of tibiae yellowish.................................................... B. signoreti Stål Legs uniformly castaneous to black.................................................. B. rubromaculatus Dallas 7. Ostiolar rugae short, extending for 1/3 the distance between inner margin ostiolum and lateral margin of metapleura. Metasternum carina with a medial, transversal sulcus................... 8 Ostiolar rugae long, extending for 2/3 of distance between inner margin of ostiolum and lateral margin of metapleura. Metasternal carina lacking sulcus.................................................... 9 8. Dorsal surface black, with red spots on hemelytra, in variable extension (fig.8).......................... ................................................................................................................ B. tricolor Bolívar Dorsal surface black, with yellow spots on hemelytra, in variable extension (fig. 9)................... .............................................................................................................. B. vexillum Breddin 9. Coxae, trochanters, base and apex of femora, base of tibiae and tarsi yellowish.......................... ................................................................................................................ B. coxalis Breddin Legs uniformly castaneous to dark-castaneous.................................. B. geniculatus (Fabricius)