Thyanta (Phacidium) fimbriata Rider, 1991

Rider, D. A. & Chapin, J. B., 1991, Revision Of The Genus Thyanta Stal, 1862 (Heteroptera: Pentatomidae) I. South America, J. New York Entomol. Soc. 99, No. 1, pp. 1-77 : 20-22

Thyanta (Phacidium) fimbriata Rider , new species

Figs. 79-93, Map 4

Description. Dorsal surface brown to medium green; usually anterior disc of pronotum paler than posterior disc.

Head evenly rounded apically; outer jugal margins sinuous, not parallel ( Fig. 80). Antennae green to brown, distal third of segment 3 reddish-brown, segments 4-5 entirely reddish brown. Anterolateral margins of pronotum in dorsal view concave; each humeral angle narrowly rounded to angulate, protruding beyond base of adjacent corium ( Fig. 79). Each pronotal cicatrice marked with piceous in mesial angle. Usually an elevated, pale, subcalloused line present between humeral angles. Hemelytra uniformly punctate, lateral margin at base pale, subcalloused; posterior margins convex ( Fig. 79); costal angle rounded, usually reaching to near middle of penultimate connexival segment; hemelytral membranes hyaline with few to many pale brown flecks. Connexiva narrowly exposed, brown to green; posterolateral angle of each segment piceous.

Ventral surface pale to medium brown, rarely with small dark-brown spots scattered on abdomen. Rostrum pale brown, most of segment 4 black, apex reaching between metacoxae or slightly beyond. Ostiolar canal acuminate apically. Femora and tibiae pale brown to green with fuscous spot on superior surface of each femur at distal third, rarely with scattered small brown spots; tarsal segments reddish or dark brown. Postspiracular black spot usually present on each side of each abdominal stemite; posterolateral angles of each sternite piceous, anterolateral angles immaculate.

Basal plates in caudoventral view subtriangular; mesial margins slightly convex; posterior margins sinuous, posteromesial angles narrowly rounded ( Fig. 91). Sclerotized rod swollen subapically, narrowed apically ( Fig. 92); spermathecal duct swollen, forming small cylindrical structure below proximal flange ( Fig. 93). Posteroventral surface of pygophore deeply sulcate, becoming shallow laterally, obtuse carina below sulcus bearing row of long setae; posterior margin of pygophore sinuously V-shaped in caudal view, also bearing row of setae ( Fig. 87); pygophore shallowly concave in both ventral and dorsal views ( Figs. 88, 89); in lateral view, broadly convex with emargination ventrally ( Fig. 90). Each paramere robust, apex spinose in both medial and ectal views ( Figs. 81, 83); roughened, spiculate area on lateral surface circular ( Fig. 82). Each lateral conjunctiva! lobe of aedeagus with 3-4 spinose diverticula ( Fig. 84); dorsomedial conjunctiva! lobe apparently absent ( Fig. 85); penisfilum prominent ( Fig. 85); median penial lobes relatively small ( Fig. 84).

Measurements. Total length 6.47-8.44 (8.04); total width 4.49-5.91 (5.60); medial length of pronotum 1.55- 1.84 (1.84). Medial length of scutellum 2.80-3. 72 (3.39); basal width 2.72-3.39 (3.16); width at distal end offrena 1.07- 1.40 (1.40). Length ofhead 1.44-1.68 (1.68); width 1.88-2.21 (2.12). Length of segments 1-5 ofantennae 0.35-0.42 (0.42), 0.74-0.81 (0.79), 0.72-0.96 (0.96), 0.94-1.18 (1.18), and 0.74- 1.18 (1.18), respectively. Length of segments 2-4 ofrostrum 1.16- 1.34 (1.34), 0. 70-0. 77 (0.70), and 0.66-0.81 (0.81), respectively.

Holotype. o labeled " BRAZIL, Sao Paulo: Serra da Bocaina S.Jose Barreiro 1650 m., Jan. 1969 M. Alvarenga." Deposited in the American Museum ofNatural History (New York) .

Paratypes. 300, 2'i?'i?. " Sao Paulo Campos do Jordiio 16.XII. 1944. F. Lane col." (o MZRS); (a) " Curitiba-Pr. IX- 1960 R.Lange leg." (b) "Lange" (o MAPA); (a) " Porto Alegre 11.10.50" (b) " Rio Grande do Sul, Pe. Buck leg." ('i? MAPA) ; (a) " Jordao R Parana Braz. 12 II 52 " (b) "CJ Drake Coll. 1956" (o USNM) ; and (a) "Jello 1." (b) "Z.M.B. Hem." ('i? ZMB) .

Distribution. Southern Brazil ( Map 4).

Comments. The distinct sulcus on the posteroventral surface of the pygophore and the double row of long setae are unique within the genus. The cylindrical structure below the proximal flange of the spermatheca is unique within this subgenus.

Etymology. Named for the double row oflong hairs on the pygophore.