Aancistroger elbenioides ( Karny, 1926b )

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 : 100-101

Aancistroger elbenioides ( Karny, 1926b)

Figs. 32 A–B, 33G–I, 34A–C

Material examined. Thailand: Loei, Na Haeo Field Research Station , (17°27'N, 101°3'36''E), 5–12.v.2001, leg. J. Constant & P. Grootaert— 1 female, 2 males (Brussels RBINS) ; same locality, 15–19.v.2003, leg. J. Constant, K. Smets & P. Grootaert— 1 female (Brussels RBINS) .

Description. Small to medium sized species. Face narrow ovoid; forehead nearly smooth; fastigium verticis little wider than scapus; ocelli visible but little distinct ( Fig. 32B ). Abdominal tergites two and three each with two rows of stridulatory pegs (10–12, 16–19; 19, 26; n = 2 males).

Wings reaching or surpassing stretched hind tibiae ( Fig. 34A ). Tegmen ( Fig. 32A ): Radius with two branches, both forked near tip; media anterior sub-fused in basal quarter with radius (veins attached to each other, but recognizable as two veins); cubitus anterior at base single branched, after division into two branches, the anterior branch makes a curvature and receives a short connection branch from MA, shortly after it divides into MP and CuA1, which are running parallel; CuA2 without further division; cubitus posterior undivided, free throughout; with 3–4 anal veins, the last branch short, arising from a common stem with preceding branch.

Legs: Fore coxa with a small 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 6–8 external and 5–6 internal spines on ventral margins; hind tibia with spaced spines on both dorsal margins, ventral margins with one preapical spine; with 3 apical spurs on both sides; dorso-internal apical spur ♀ 13:9 (= 1.44x), ♂ 13:9.5 (= 1.37x) times longer than dorso-external spur ( Fig. 34C ).

Coloration. General color uniformly yellowish brown; abdominal tergites greyish red. Face uniformly yellowish or greyish brown; compound eyes black. Tegmen semitransparent yellow, along fore and hind margins whitish; veins yellow; hind wing semitransparent white; veins yellow, cross-veins pale.

Male. Eighth abdominal tergite of normal length. Ninth abdominal tergite not globular, only lateral margins curved ventrad; red; apical margin in middle subtruncate, faintly bi-concave; on both sides with a long downcurved spine that is at base wide and round and light yellow, in apical two thirds compressed and dark brown; tip acute ( Figs. 33 G–H). Tenth abdominal tergite almost hidden beneath ninth tergite; largely membranous except for areas around bases of cerci. Epiproct semi-circular with wide median groove; paraproctes compressed, setose on apical surface. Subgenital plate little wider than long, with medial furrow, lateral margins convex, not approaching, apical margin subtruncate; styli fused with subgenital plate, visible as short cones at apico-lateral angles of plate ( Fig. 33I ).

Female. Seventh abdominal sternite with oval, marginated groove at very base; otherwise of normal shape. Subgenital plate separated by a rather short membranous area from preceding sternite; with convex lateral margins and concave apical margin; surface flat in middle, upcurved on both sides ( Fig. 34B ). Base of ovipositor normal. Ovipositor rather short, substraight but with convex dorsal and concave ventral margin; tip subobtuse ( Fig. 34A ).

Measurements (2 males, 2 females).—body w/wings: male 31, female 36; body w/o wings: male 16–17, female 20–21; pronotum: male 3.0–3.5, female 3.3–3.5; tegmen: male 26.5–27.0, female 29.0–29.5; tegmen width: male 8, female 8; hind femur: male 8.5, female 10.0–10.5; antenna: male 80–90; ovipositor: female 10.5 mm.

Figures

FIGURE 32. Genus Aancistroger: A–B, A. elbenioides (Karny, 1926); C–D, A. primitivus Gorochov, 2005; E–F, A. vietus Gorochov, 2004; G–H, A. inarmatus sp. nov.—Habitus dorsal view (A, C, E, G); face (B, D, F, H). Scales 10 mm.

FIGURE 33. Genus Aancistroger: A–C, A. inarmatus sp. nov.; D–F, A. vietus Gorochov, 2004; G–I, A. elbenioides (Karny, 1926).—Male abdominal apex in lateral view (A, F–G), apical view (B, D), oblique ventral view (C), ventral view (E, I), dorsal view (H).

FIGURE 34. Genus Aancistroger: A–C, A. elbenioides (Karny, 1926); D–F, A. primitivus Gorochov, 2005; G, A. inarmatus sp. nov.; H, A. vietus Gorochov, 2004.—Habitus lateral view with ovipositor (A, D), apical area of female abdomen with seventh sternite and subgenital plate in ventral view (B, E), apical area of right hind tibia in dorsal view (C, F–H). Scales 10mm.