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 Brachystethus coxalis Breddin, 1904 ( Figs. 11 , 21 , 31 , 41 , 62 ) Brachystethus coxalis BREDDIN, 1904 :178 ; BERGROTH, 1908:178 ; KIRKALDY, 1909:152 (cat.). Typematerial. Lectotype , heredesignated, labeled: a) Amazonas , Peru ; b) Brachystethus coxalis Bredd. ; coll. Breddin ; d) Syntipus ; e) DEI Eberswalde; f) 1 ST coxalis ( DEIC ). Breddin described the species based on two specimens, one male and one female. Only the male syntype was found. Type locality: Peru ( Amazonas ) and Panama (Chiriquí). Description. Dorsal surface dark-castaneous to black, with a marginal yellow stripe ( fig. 11 ). Head dark-castaneous, with well-marked wrinkles. Puncturesdensely distributed. Outer margins of jugae with yellowish stripe, wider at base. Antennae dark-castaneous to black, except the first segment, yellowish. Fourth segment cylindrical. First antennal segment a little more than 3/4 as long as second, third almost twice as long as second, fourth slightly less than one and a half as long as third, fifth lacking. Pronotum darkcastaneous to black, with a broad yellow stripe along anterolateral margins. Punctures fine regularly distributed, with sparse coarse punctures restrict tothe area after cicatrices. Before cicatrices, smallerpunctures more concentrated alonganterior marginof pronotum. Scutellum dark-castaneous to black, with fine punctures regularly distributed. Coarse punctures on basal third, concentrated in 1+1 groups along lateral margins. Punctures slightly smaller, sparse, on basal half. Corium dark-castaneous, with yellow border on basal third of costal margin and with a small yellowish callus near and entad the apex of radial vein. Legs yellowish on coxae, trochanters, base and apex of femora, ventral face and apex of tibiae and tarsi; remaining segments dark-castaneous, almost black. Ventral surface of thorax dark-castaneous to black, with castaneous to black medium-sized punctures. Ostiolar rugae reaching 2/3 of distance between inner margin of ostiolumand lateral margin of metapleura. Metasternal carina flat in profile. Connexivum with a subcaloused yellow stripe, scarcely punctured, over outer lateral third of each segment; remaining of connexival segments dark-castaneous, almost black, with punctures minutely and densely distributed. Venter dark-castaneous, with a marginal, subcaloused yellowish stripe. Punctures fine regularly distributed, except on the middle, where they are less frequent. Figs.56-60. Genital plates, ventral: 56, Brachystethus rubromaculatus ; 57, B. signoreti ; 58, B. cribrus ; 59, B. tricolor ; 60, B. vexillum (gc8, gonocoxite 8; gc9, gonocoxites 9; la8, laterotergite 8; la9, laterotergite 9; VII, seventhsegment; X, tenthsegment). Scale, 1 mm. Male genitalia. Pygophore quadrangular. Lobes of dorsal rim conspicuous, moderately projected posterad, rounded at apex. Genital cup processes not visible in dorsal view. Parameres withacute apex, turned anterad ( figs. 21, 31 ). Ventral rim openly V-like ( fig. 41 ). Measurements (n=1). Headlength 2.03, width 3.00; interoculardistance 1.64; anteocularlength 0.74; antennalsegments - lacking; pronotallength 4.34, width 10.02; scutellarlength 6.40, width 6.24; corium length, not measured; abdominalwidth 11.19; totallength 15.87. Female genitalia. Posteriorborders of gonocoxites 8 forming an almost rightangle over laterotergites 9. Sutural borders of gonocoxites 8 parallel ( fig. 62 ). Measurements (n=1). Headlength 2.00, width 3.04; interoculardistance 1.60; anteocularlength 0.72; lengthof antennalsegments: I - 0.88; II - 1.12; III - 2.00; IV - 2.80; V - lacking; pronotallength 4.18, width 10.02; scutellarlength 6.68, width 6.51; corium length 9.52; abdominalwidth 11.11; totallength 15.70. Material examined. VENEZUELA , Amazonas : Cerro de la Neblina ( 1880m ),, 11.II.1984 , Stupakoff ( AMNH ). No data, ( ZMUC ) . Distribution. Panama (Chiriquí), Venezuela (Amazonas), Peru (Amazonas). Comments. Brachystethus coxalis is the sister group of B. vicinus and B. improvisus , sharing with them one synapomorphy, the yellowish tarsi, and two homoplastic characters, coxae, and apex of femora and base of tibiae yellowish ( BARCELLOS & GRAZIA, 2003 ). It can be distinguished from B. vicinus and B. improvisus by the flat metasternal carina, and from the latter also by the shape of parameres, with acute apex.