Otidiogryllacris lawang, 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 : 80-82

Otidiogryllacris lawang sp. nov.

Figs. 25 F–J

Material examined. Holotype (male): Indonesia: West Sumatra, Maninjau—Puncak Lawang , elev. 600–950 m (0°17'S, 100°15'E), 17.iii.1995, leg. S. Ingrisch— 1 female (Bonn ZFMK).

Diagnosis. The new species is conspicuous for the transverse black band along ventral margin of fastigium verticis which is interrupted in middle and continued at both sides on scapus ( Fig. 25H ). It is similar to O. willemsei ( Karny, 1924b) but differs by somewhat larger size and longer ovipositor, but more significantly by the subgenital plate that has approaching lateral margins and a subtruncate hind margin instead of being semi-circular with wide angularly excised hind margin with rounded lobes. From O. auriculata it also differs by the shape of the subgenital plate.

Description. Small species. Head: Face ovoid ( Fig. 25H ); forehead nearly smooth; fastigium verticis little wider than scapus, separated by a transverse suture from fastigium frontis; ocelli distinct, whitish. Abdominal tergites two and three without stridulatory pegs.

Wings reaching to about hind knees ( Fig. 25F ). Tegmen: Radius with two branches: only RP forked once more near tip; media anterior has a common stem with radius, arising as first posterior branch of R in basal half of tegmen; media posterior absent; cubitus anterior undivided; cubitus posterior undivided, free throughout; with 5 Anal veins, the last one incomplete and with a common base with preceding vein.

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 7–10 external and 3–7 internal spines on ventral margins; hind tibia with spaced spines on both dorsal margins, ventral margins with one pre-apical spine; with 3 apical spurs on both sides.

Coloration. General color rather uniformly brown, pronotum with indistinctly darkened anterior area and with an elongate dark spot in middle of transient zone between disc and lateral lobes; tibiae of all legs with an indistinct dark spot about in mid-length. Face yellowish brown with a sinuate dark brown band from base of scapus and below lateral ocelli to base of scapus. Tegmen semi-transparent yellow, veins little darker; hind wing semitransparent white; veins yellow to brown.

Male unknown.

Female. Seventh abdominal sternite distinctly shorter than preceding sternites, followed by a long membranous zone ( Figs. 25 I–J). Subgenital plate largely membranous, only lateral and apical areas sclerotised, apical area flattened; apical margin very faintly bilobate almost truncate in middle ( Fig. 25I ). Ovipositor falcate, strongly upcurved especially in subbasal area; laterally furrowed, margins gradually approaching towards apex; the median valves of the ovipositor are laterally distinctly projecting at base between the dorsal and ventral valves; apical area slightly thickened but not widened, tip subobtuse ( Fig. 25G ).

Measurements (1 female).—body w/wings: 21; body w/o wings: 18; pronotum: 4.2; tegmen: 13.5; tegmen width: 5; hind femur: 11; antenna: 60; ovipositor: 8 mm.

Etymology. The new species is named after the type locality; noun in apposition.

Figures

FIGURE 25. Genus Otidiogryllacris: A–E, O. auriculata (Krauss, 1902) male (A–C) and female (D–E); F–J, O. lawang sp. nov. female holotype; K–O, O. bamusbama sp. nov. male holotype.—Habitus dorsal view (A, F, K), habitus lateral view (D, G), face (H, L), male abdominal apex in dorsal (B), oblique ventro-lateral (C), lateral (M), and ventral view (N), projections of ninth abdominal tergite in greater magnification (O); female end of abdomen with seventh sternite, subgenital plate and base of ovipositor in ventral (E, I) and lateral view (J). Scales 10 mm.