Neolarnaca vera nigrinotum, Ingrisch, 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 : 228-229

Neolarnaca vera nigrinotum ssp. nov .

Figs. 80 E–L

Material examined. Holotype (male): Vietnam: Hoang Lien NP, (22°21'N, 103°46'20''E), 1–5.vii.2013, leg. J. Constant & J. Bresseel (I.G. 32.454)—(Brussels RBINS).

Other specimens studied: Vietnam: same data as holotype— 2 females, 3 males (paratypes) (Brussels RBINS).

Diagnosis. L. v. nigrinotum is a mountain species that differs from N. v. vera by the spines of the ninth abdominal tergite that are shorter and closer approached and the tergite at base of these spines is not swollen and furrowed in between, the male subgenital plate is less strongly bilobate at tip. The female has the darkened and somewhat stiffened intersegmental membrane between the seventh abdominal sternite and the subgenital plate shorter and the subgenital plate narrower and longer than in N. v. vera . Compared to N. v. aurelostria Bian & Shi 2016 the appendages of the male ninth tergite appear shorter and wider spaced and the male subgenital plate hardly wider than long with the apical margin only little excised in middle instead of distinctly wider than long and distinctly bilobate in N. v. aurelostria . In N. v. nigrinotum the wings do not fully reach the hind margin of the second abdominal tergite while in both other subspecies they reach the apex of the third abdominal tergite.

Description. Medium sized species. Head: Face robust but not particularly large; in frontal view ovoid; forehead nearly smooth; fastigium verticis distinctly wider than scapus; medium and lateral ocelli small, little distinct ( Fig. 80F ). Abdominal tergites two and three each with rows of rather large stridulatory pegs (0, 7–8; 4–8, 8–10; n = 2 males, 2 females; Fig. 80L ).

Wings hardly longer than pronotum, reaching or surpassing apex of first abdominal tergite, not overlapping except near tip ( Fig. 80E ). Tegmen: tegmen strongly shortened, not fully reaching tip of second abdominal segment; venation reduced and somewhat variable between specimens.

Legs: Fore coxa with large 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 rather few spines on both ventral margins, with 1–4 external and 0–4 internal spines on ventral margins, increasing in size towards posterior end; 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 uniformly yellowish to reddish brown; pronotum black. Face uniformly reddish brown; eyes darker. Tegmen transparent brownish; hind wing faintly surpassing tegmen; semi-transparent with dark veins.

Male. Eighth tergite prolonged; ninth tergite with apical area curved down and narrowed, apical margin truncate or faintly concave and at both lateral angles terminating into a long and stout, slightly incurved, acute spine ( Figs. 80 I–J). Tenth abdominal tergite in situ hidden. Epiproct very large, furrowed along midline, lateral margins strongly bulging, apex slightly bifid. Subgenital plate in ventral view with convex lateral margins, ventral surface strongly convex; apex wide, slightly bilobate between bases of styli; in lateral view, lateral margin terminating into a cone dorso-laterad of base of stylus; styli present ( Fig. 80K ). Phallus membranous.

Female. Seventh abdominal sternite basal half normal, apical half membranous or nearly membranous with indication of a double-pit not clearly separated from membranous basal area of subgenital plate. Subgenital plate basal area membranous, wider; apical area lobular, apex simply rounded ( Fig. 80H ). Ovipositor base bulging laterally, otherwise strongly upcurved, sickle- or hook-shaped; tip narrowly obtuse ( Fig. 80G ).

Measurements (4 males, 2 females).—body w/o wings: male 22–24, female 21–29; pronotum: male 4.5–4.7, female 4.7–5.2; tegmen: male 5.0–5.5, female 5.5–6.0; hind femur: male 12.5–13.5, female 14.0–14.5; antenna: male 70, female 80; ovipositor: female 10–11 mm.

Etymology. The new taxon is named for the black pronotum; noun in apposition.

Figures

FIGURE 80. Genus Neolarnaca: A–D, N. v. vera Gorochov, 2004 female; E–L, N. vera nigrinotum ssp. nov. male holotype (E–F, I, K), female paratype (G, H), and male paratype (J, L).—Habitus dorsal view (A, E), face (B, F), ovipositor (C, G), female seventh abdominal sternite and subgenital plate (D, H), male abdominal apex in apical (I), ventral (K) and lateral view (J), stridulatory pegs on second and third abdominal tergites, front is right (L).