Gryllacris (Gryllacris) bancana Karny, 1930a, 2018

Ingrisch, Sigfrid, 2018, New taxa and records of Gryllacrididae (Orthoptera, Stenopelmatoidea) from South East Asia and New Guinea with a key to the genera, Zootaxa 4510 (1), pp. 1-278 : 46

Gryllacris (Gryllacris) bancana Karny, 1930a stat. nov.

Figs. 10C , 12H , 13 G–I

Gryllacris obscura bancana Karny, 1930a

Material examined. Indonesia: Sumatra, Sumatera Selatan, Palembang , (2°59'S, 104°45'E), 1902, leg. Dr. A. Fuchs— 1 male (Museum Wiesbaden) .

Discussion. This taxon was so far only known from the holotype, a male from Banka Island [Pulau Bangka]. Thus not far from Palembang. G. bancana differs from G. obscura by the narrow shape of the ninth abdominal tergite and its apical projection that is in about mid-length divided by a transverse furrow, which is concave in middle and on both sides provided with a semicircular compressed projecting lobe, while the apical area is deeply furrowed in midline and little bent proximad. Males of G. obscura that I have seen so far either do not have a transverse fold in mid-length of the projection of the ninth abdominal tergite or have a weak fold without any projecting lobes and the apical area is not or only weakly furrowed. Those differences of the ninth male abdominal tergite validate a separate full species status.

Description. Large species. Head: Face large, ovoid; forehead nearly smooth; fastigium verticis hardly wider than scapus; ocelli indistinct ( Fig. 12H ). Abdominal tergites two and three each with two rows of very small stridulatory pegs.

Wings surpassing hind knees and reaching about middle of hind tibia ( Fig. 10C ). Tegmen: Radius with two branches, both forked near tip; media anterior fused in basal area with radius; media posterior absent; cubitus anterior forks between basal third and mid-length into two veins, CuA1 and CuA2; cubitus posterior undivided, free throughout; with 4 anal veins.

Legs: Fore coxa with a spine at fore margin; fore and mid femora unarmed; fore and mid tibiae with four pairs of large ventral spines and one pair of smaller ventral spurs; hind femur with 7–9 external and 9–10 internal spines on ventral margins; hind tibia with spaced spines on both dorsal margins, ventral margins with one pre-apical spine each; with 3 apical spurs on both sides.

Coloration. General color light brown (originally conserved in alcohol); disc of pronotum with hieroglyphic black figure; anterior and posterior margins narrow black. Vertex with a round black spot in middle and black bands on both sides. Legs light brown; genicular areas little darkened; anterior and lateral surfaces of fore tibia dark brown. Face yellowish brown with small black spots at lateral ends of clypeo-frontal suture, fastigium verticis with a large dark spot; antennal scrobae dark brown; scapus in part indistinctly infumate; tip of mandibles black. Tegmen yellowish transparent, veins hardly darker; hind wing transparent with dark bands along veins and veinlets.

Male. Eighth abdominal tergite strongly prolonged behind. Ninth abdominal tergite (type F in Brunner 1888) wide at base; dorsal apical margin prolonged into a short and narrow, setose projection with bifid tip; lateral area curved down, with both sides closing below the projection and forming in middle a stout elevation little widening towards tip and with subtruncate apex, in midline with a slight furrow; lateral areas of ninth tergite blackish brown, projection and central elevation pale ( Figs. 13 G–I). Subgenital plate wider than long with lateral margins convex and little upcurved; apical margin slightly bilobate; styli stout and long, inserted in about two thirds of plate length.

Female unknown.

Measurements (1 male).—body w/wings: 50; body w/o wings: 31; pronotum: 7.5; tegmen: 39; tegmen width: 12; hind femur: 22; antenna: 140 mm.

Figures

FIGURE 10. Genus Gryllacris: Habitus dorsal view: A–B, G. (P.) ovulicauda sp. nov. male holotype (A) and female paratype (B); C, G. bancana Karny, 1930 male; D, G. v. vittata Walker, 1869 female holotype; E–F, G. s. signifera (Stoll, 1813) male (E) and female (F); G, G. f. fuscifrons Gerstaecker, 1860 male; H–I, G. obscura cambodiae Gorochov, 2007 female (H) and male (I); J, G. sok sp. nov. female holotype. Scales 10 mm.

FIGURE 12. Genus Gryllacris: Face: A, G. (Pardogryllacris) ovulicauda sp. nov. male holotype; B–C, G. obscura cambodiae Gorochov, 2007 male (B) and female (C); D, G. f. fuscifrons Gerstaecker, 1860 female holotype; E, G. s. signifera (Stoll, 1813) male; F, G. sok sp. nov. female holotype; G, G. incornuta sp. nov. male holotype; H, G. bancana Karny, 1930; I, G. o. obscura Brunner, 1888; J, G. v. vittata Walker, 1869 female holotype; K, G. kinabaluensis Griffini, 1915 female; L, G. (P.) longiloba Gorochov & Dawwrueng, 2015 female; M, G. (P.) lineolata menzeli (Karny, 1924) male; N, G. (P.) l. lineolata Serville, 1838 male; O, G. (Gigantogryllacris) bilineata sp. nov. male holotype; P, G.(Gi.) ligulata sp. nov. male holotype.

FIGURE 13. Genus Gryllacris: A–C, G. (Pardogryllacris) ovulicauda sp. nov. holotype; D–F, G. obscura cambodiae Gorochov, 2007; G–I, G. bancana Karny, 1930; J–M, G. s. signifera (Stoll, 1813).—Male abdominal apex in about dorsal (A), ventral (B, E, H, J), oblique lateral (C, F, I, K), apical (D, G, L), and oblique apical view (M).