Brachystethus coxalis Breddin, 1904

Barcellos, Aline & Grazia, Jocélia, 2003, Revision Of Brachystethus (Heteroptera, Pentatomidae, Edessinae), Iheringia, Série Zoologia 93 (4), pp. 413-446 : 436-438

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.

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.

Figures

Figs. 2-13. 2, 3, Brachystethus rubromaculatus Dallas, 1851; 4, 5, B. signoreti Stål; 1872; 6, B. cribrus (Fabricius, 1781); 7, B. schuhi sp. nov.; 8, B. tricolor Bolívar, 1879; 9, B. vexillum Breddin, 1903; 10, B. geniculatus (Fabricius, 1787); 11, B. coxalis Breddin, 1904; 12, B. improvisus Breddin, 1905; 13, B. vicinus Signoret, 1851. Magnification 1.63X.

Figs. 30-33. Pygophore, caudal (tenth segment omitted): 30, Brachystethus geniculatus; 31, B. coxalis; 32, B. improvisus; 33, B. vicinus (dor, dorsal rim; pa, paramere; vr, ventral rim). Scale, 1mm.

Figs. 34-43. Pygophore, ventral rim, ventral: 34, Brachystethus rubromaculatus; 35, B. signoreti; 36, B. cribrus; 37, B. schuhi; 38, B. tricolor; 39, B. vexillum; 40, B. geniculatus; 41, B. coxalis; 42, B. improvisus; 43, B. vicinus. Scale, 1 mm.

Figs. 61-64. Genital plates, ventral: 61, Brachystethus geniculatus; 62, B. coxalis; 63, B. improvisus; 64, B. vicinus (gc8, gonocoxite 8; gc9, gonocoxites 9; la8, laterotergite 8; la9, laterotergite 9; VII, seventh segment; X, tenth segment). Scale, 1 mm.