Brachystethus vexillum Breddin, 1903

Barcellos, Aline & Grazia, Jocélia, 2003, Revision Of Brachystethus (Heteroptera, Pentatomidae, Edessinae), Iheringia, Série Zoologia 93 (4), pp. 413-446 : 431-432

Brachystethus vexillum Breddin, 1903

( Figs. 9 , 19, 29 , 39 , 49 , 60 , 69 )

Brachystethus vexillum BREDDIN, 1903:371 ; BERGROTH, 1908:178; KIRKALDY, 1909: 152; PIRÁN, 1955:337.

Daimonocoris bolivianus KORMILEV, 1951:38 ; PIRÁN, 1955:337 (syn.).

Type material of B. vexillum . Holotype, examined, labeled: a) Bolivia; b) Brachystethus vexillum Bredd ; c) coll. Breddin; d) Holotypus; e) Dtsch. Entomol. Institut Berlin; f) HT vexillum ( DEIC). Typelocality: Bolivia.

Description. Dorsal surface black, with yellowish stripes on corium ( fig. 9 ). Head black, with well-marked wrinkles. Punctures moderately distributed, restrict to base of jugae and tylus. Antennae black; fourth antennal segment cylindrical. First antennal segment about 3/4 longer than second, third slightly longer than second, fourth almost twice longer than third and about 3/4 the length of fifth, the longest. Pronotum black, with fine punctures regularly distributed and coarse punctures sparse behind cicatrices. Before cicatrices, medium-sized punctures densely distributed. Anterolateral angles yellowish at apex. Scutellum black, with coarse punctures sparse, more frequent beside lateral margins of basal half. Corium black, without callus, with two yellow stripes: one on clavus, adjacent to claval suture and another occupying 2/3 ectad to radial vein, becoming broader apically toward clavus. Legsdark reddish-castaneous to black. Ventral surface of thorax dark reddish-castaneous to black; medium-sized punctures, concolor. Ostiolar rugae short, reaching 1/3 of distance between inner margin of ostiolum and lateral margin of metapleura. Metasternal carina with conspicuous transversal sulcus; in profile, little elevatedanteriorly. Connexivum black, inner superior angle of each segment orange, segments finely punctured. In some specimens, the orange area extends along inner lateral margin of seventhsegment. Venter red, with black spots on lateral thirds, as follows: one near lateral margin of each segment, becoming broader posterad, other small, around spiracles. On sternites III to VI, also present, entad to others, a larger spot, sub-elliptical, close to spiracle. Coarse punctures more concentrated on lateral thirds, over these spots. Spiracles black.

Male genitalia. Pygophore globose, apex and base equally wide. Lobes of dorsal rim conspicuous, strongly projected posterad, rounded at apex. Genital cup processes littlevisible dorsally ( figs. 19, 29). Parameres withacute apex, anteriorly directed ( fig. 49). Ventralrimopenly V-like ( fig. 39).

Measurements (n=3). Headlength 1.73 (1.68-1.76) ± 0.05, width 2.56 (2.52-2,60) ± 0.04; interoculardistance 1.49 (1.44-1.52) ± 0.05; anteocularlength 0.64; lengthof antennal segments: I - 0.85 (0.80-0.88) ± 0.05; II - 1.17 (1.12-1.20) ± 0.05; III - 1.44 (1.28-1.52) ± 0.14; IV - 2.59 (2.48-2.72) ± 0.12; V - 3.68; pronotallength 3.70 (3.59-3.84) ± 0.13, width 8.63 (8.52-8.85) ± 0.19; scutellarlength 5.87 (5.85-5.93) ± 0.05, width 5.29 (5.18-5.43) ± 0.13; coriumlength 8.24 (8.02-8.52) ± 0.26; abdominalwidth 10.08 (9.69-10.35) ± 0.35; total length 13.64 (13.03-14.28) ± 0.63.

Female genitalia. Sutural borders of gonocoxites 8 parallel, except on apical fifth. Posterior borders convex on outer half and sub-retilineous on inner half (fig. 60). Gonocoxites 9 almost three times wider across apex of arms than longmedially; anterior border openly U-like, moderately excavate at middle. Length of arms of gonocoxites 9 equal to 1/6 of plate width. Thickening of vaginal intima digitiform, elongated. Ductus receptaculi thin, one and a half longer before than after vesicular area. Capsula seminalis digitiform. Annular crests sub-parallel, turned toward vesicular area ( fig. 69).

Measurements (n=9). Headlength 1.93 (1.80-2.08) ± 0.08, width 2.77 (2.72-2.84) ± 0.05; interoculardistance 1.60 (1.48-1.68) ± 0.06; anteocularlength 0.69 (0.64-0.72) ± 0.04; lengthof antennalsegments: I - 0.91 (0.84-0.96) ± 0.04; II - 1.24 (0.96-1.36) ± 0.13; III - 1.56 (1.36-1.88) ± 0.16; IV - 2.75 (2.60-2.96) ± 0.13; V - 3.58 (3.44-3.68) ± 0.09; pronotallength 4.12 (3.84-4.34) ± 0.15, width 9.65 (9.27-10.02) ± 0.25; scutellarlength 6.74 (6.51-7.01) ± 0.17, width 5.97 (5.68-6.43) ± 0.21; coriumlength 9.32 (8.93-9.85) ± 0.27; abdominalwidth 11.44 (11.19-11.52) ± 0.13; totallength 15.56 (14.95-16.70) ± 0.56.

Material examined. PERU, Cuzco: Machu Picchu ,, 28.XI.1982, E.R. Ross col., California Academy of Sciences ( DARC) ; (over ruins, 2600-2800m), 2, 4, 1.VII.1964, B. Malkin ( MZSP) ; , 7.V.1965 (arbusto) ( MZSP) ;, 1942, Weyrauch ( USNM) ; Prov. Paucartambo, Pillahuata (2800m) , , 2, 19.XII.1952, F. Woytkowski ( USNM) ; Marcapata ,, “Coll. I.R.Sc. N.B.” ( DARC) . BOLIVIA, Yungas de Palmar (2000m),, R. Zischka ( USNM) ; Cochabamba: Chapare prov., Alto Palmar (110m), 2, 2, XI.1961 ( DARC) .

Distribution. Peru (Cuzco), Bolivia (Cochabamba).

Comments. Bra chystethus vexillum is closely related to B. tricolor . The dorsal color pattern, with yellow stripes, and the globose pygophore distinguish this species from B. tricolor .

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. 24-29. Pygophore, caudal (tenth segment omitted): 24, Brachystethus rubromaculatus; 25, B. signoreti; 26, B. cribrus; 27, B. schuhi; 28, B. tricolor; 29, B. vexillum (dor, dorsal rim; gcp, genital cup process; pa, paramere; vr, ventral rim). Scale, 1 mm.

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. 44-52. Left paramere, posteroventral: 44, Brachystethus rubromaculatus; 45, B. signoreti; 46, B. cribrus; 47, B. schuhi; 48, B. tricolor; 49, B. vexillum; 50, B. geniculatus; 51, B. improvisus; 52, B. vicinus. Scale, 0.5 mm.

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, seventh segment; X, tenth segment). Scale, 1 mm.

Figs. 69-72. Laterotergites, gonocoxites and gonapophyses of ninth segment, and ectodermical genital ducts, ventral: 69, Brachystethus vexillum; 70, B. geniculatus; 71, B. improvisus; 72, B. vicinus (aac, anterior annular crest; ch, chitinellipsen; cs, capsula seminalis; dr, ductus receptaculi; g9, gonapophyses 9; gc9, gonocoxites 9; la9, laterotergites 9; mt, medial thickening of gonapophyses 9; or, orificium receptaculi; pac, posterior annular crest; pco, pars comunis; pi, pars intermedialis; tvi, thickening of vaginal intima; X, tenth segment). Scale, 1 mm.