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.