Thyanta (Argosoma) curvata Rider, 1991

Thyanta (Argosoma) curvata Rider , new species

Figs. 285-299, Map l

Description. Medium to large; dorsal surface pale green to pale brown, female specimens usually with reddish transhumeral markings in form of oblong spot on each side of middle and smaller spot near apex of each humeral angle, sometimes apex of scutellum also reddish; punctures usually concolorous with surface.

Apex of head narrowly rounded; outer jugal margins not parallel ( Fig. 286). Antennae pale green to pale brown, sometimes distal portions of last three segments darker. Anterolateral margins ofpronotum straight to slightly concave in dorsal view; humeral angles narrowly rounded, almost angulate, protruding beyond base of adjacent coria by one-halfwidth ofeye or less ( Fig. 285); pronotal cicatrices immaculate. Hemelytra shallowly and uniformly punctate; posterior margins straight to slightly convex; posterolateral angles narrowly rounded, ending above penultimate connexival segments; hemelytral membranes hyaline, lacking distal brown flecks. Connexiva usually narrowly exposed; incisures usually minutely tipped with black.

Ventral surface pale yellowish-green to brown; punctures concolorous with surface. Rostrum green to pale brown, apical half of segment 4 piceous; reaching onto third (second visible) abdominal stemite. Ostiolar canals acuminate apically. Femora and tibiae green to brown; tarsi and distal portions oftibiae sometimes darker. Postspiracular black spots lacking; posterolateral angles of abdominal stemites piceous.

Mesia! margins of basal plates in caudoventral view straight to slightly convex; posterior margins slightly convex; posteromesial angles slightly emarginate ( Fig. 297). Sclerotized rod swollen subapically, distinctly narrowed apically ( Fig. 298). Spermathecal duct moderately swollen below proximal flange, without coiling from swollen area to sclerotized rod ( Fig. 299). Posterior margin of pygophore in caudal view broadly and shallowly U-shaped, medial portion straight to slightly concave, sinuous ( Fig. 293); blunt, chin-like protuberance prominent in ventral view ( Fig. 294); posterior margin broadly U-shaped in dorsal view ( Fig. 295); pygophore concave in lateral view ( Fig. 296). Concave surface of each paramere oriented more dorsad than mediad; in medial view apex short, rounded, distinctly bent dorsad ( Fig. 287); in ectal view, apex bluntly rounded ( Fig. 289); roughened, spiculate area on lateral surface ovoid ( Fig. 288). Each lateral conjunctiva! lobe ofaedeagus with 1-2 narrowly rounded diverticula ( Fig. 292); dorsomedial lobe lacking ( Fig. 291); median penial lobes and penisfilum relatively small, obscured by conjunctiva! membranes ( Fig. 290).

Measurements. Total length 6.78-8.75 (6.75); total width 4.57-5.83 (4.57); medial length of pronotum 1.50-1.73 (1.50). Medial length of scutellum 2.94-3.61 (2.94); basal width 2.80-3.53 (2.80); width at distal end of frena 0.96-1.25 (0.96). Length ofhead 1.46-1.68 (1.46); width 1.88-2.23 (1.88). Length of segments 1-5 ofantennae 0.35-0.44 (0.44), 0.75-0.96 (0.86), 0.77-0.99 (0.77), 0.96-1.10 (0.96), and 0.96-1.10 (0.96), respectively. Length of segments 2-4 of rostrum 1.14-1.32 (1.18), 0.77-0.88 (0. 77), and 0.74-0.81 (0. 74), respectively.

Holotype. 5 labeled (a) " El Limon AR VENEZUELA 450m. 31 -V- 57 " (b) "F.Fernandez Y., C. J. Rosales Cols." (c) "Venezuela-Inst. Zool.Agricola­Fac.Agronomia Univ. Central." Deposited in the Universidade Central de Venezuela (Maracay) .

Paratypes. 655, 11~~- Labeled same as holotype (5'3'3/3~~ IZA); (a) " Mariara Venezuela, Carabobo 460m. 12-11- 1967 " (b) "Trampa de luz" (c) "L.Femandez S. col." (d) "Venezuela-Inst. Zool.Agricola-Fac.Agronomia Univ. Central" (~ IZA) ; (a) " Galeras del Pao COJEDES Venezuela 26-IV- 1963 " (b) "C.J.RosalesA. Perez" (c) "Venezuela-Inst. Zool.Agricola-Fac.Agronomia Univ. Central" (~ IZA) ; " VENEZUELA: Aragua 2kmN OcumareDeLa Costa , 21-22-VI-1976 A.S.Menke&D.Vincent" (2 USNM) ; (a) " Venezuela-Barinas. Reserva Forestal-Ticoporo . 230m 3- 1 0- IV-66 " (b) "F. Fernandez. Y Luis.J.July" (c) "Venezuela-InstZool.Agricola-Fac.Agronomia Univ. Central" (322 IZA) ; " RioFrio Colombia S.A.2-VIl-1926 George Salt" (2 USNM) ; (a) " El Sombrero Cenarico , Yenz. 29-IV 1953 " (b) "Col. J. Requena" (c) "Venezuela­Inst Zool.Agricola-Fac.Agronomia Univ. Central" (2 IZA) ; and " VENEWELA: Zulia Carrasquero 29-30 May 1976 A.S.Menkee&D.Vincent" (<3 USNM) .

Distribution. Northern South America (Map 1).

Comments. Some female specimens of this species closely resemble maculate individuals of the Central American species T. (A.) maculata (F.). The male genitalia are distinctive, as no other congener has the apex of each paramere short, rounded, and curving dorsad in medial view as in this species.

Etymology. Named for the distinctly curved apex of each paramere.