Apterolarnaca apta Gorochov, 2004

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 : 117-118

Apterolarnaca apta Gorochov, 2004

Figs. 39 A–G

Material examined. Vietnam: Prov. Vinhfu, Tam Dao N.P., (21°31'N, 105°33'E), 25–30.vii.2011, leg. J. Constant & J. Bresseel (I.G. 31.933)— 1 female, 2 males (Brussels RBINS) .

Discussion. The male was so far unknown. It was collected from the type locality of A. apta . It is similar to the male of A. ulla Gorochov, 2004 also described from Vietnam. It differs by the ninth abdominal tergite which is not divided from base but entire in basal quarter, then divided but with the internal margins still along side for another quarter of length, then with lobes more strongly deviating and with apical spine bent proximad only visible in lateral view ( Figs. 39 E–F), not from behind as in A. ulla . The subgenital plate also has the lateral margins strongly upcurved in almost a semi-circle as in A. ulla , but in contrast to the latter in A. apta the styli are free, not fused with the plate. The large spines in the posterior area of the internal ventral margin of the hind femur are larger in A. apta than in A. ulla .

Description. Small species. Head: Face oval; nearly smooth; fastigium verticis wider than scapus; ocelli little distinct; fastigium frontis separated from fastigium verticis by a very fine suture; subocular furrows weak ( Fig. 39G ). Abdominal tergites two and three each with two rows of stridulatory pegs.

Apterous, without traces of wings.

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; on mid tibia the basal pair small, sometimes missing on one side; hind femur with 2–4 external and 7–8 internal spines on ventral margins; on internal margin the apical 3–4 spines are very large and thick, one is of medium size, the remainder small of normal size ( Fig. 39D ); hind tibia curved, in male more than in female ( Figs. 39 A–C); with very small spaced spines on both dorsal margins, ventral margins without pre-apical spine; with 3 apical spurs on both sides.

Coloration. General color brown with black marks; vertex with a large semicircular spot at hind margin varying from completely black to reduced to two narrow strokes; fastigium verticis with 2 black spots; pronotum with ventral margins of paranota black and disc with a black medial band of varying extension but always including a pair of small round light spots followed by a short band-shaped light spot; abdominal tergites with black medial band; legs brown with black band and spots. Face marbled brown and whitish; with black spots on fastigium verticis, internal edge of antennal scrobae, very base of scapus, clypeo-frontal suture, and with black bands below compound eyes; antennae with first two basal segments light brown, flagellum black with spaced light rings; mandibles at base marbled, in middle orange, at tip black; maxillary palpi light brown, last segment with little distinct black ring.

Male. Ninth abdominal tergite globular; in apical half furrowed, later divided in midline; from middle of ventro-apical margin with a long and stout process, curved proximad and with a stout but short hooked spine at tip ( Fig. 39 E–F).

Female ovipositor short and strongly curved, but not sickle-shaped; tip obtuse ( Fig. 39D ). Measurements (2 males, 1 female).—body w/o wings: male 19–22, female 17; pronotum: male 3.5–4.0, female 4; hind femur: male 10.5–11.0, female 9; antenna: male 60; ovipositor: female 6.5 mm.

Figures

FIGURE 39. Genera Apterolarnaca (A–G) and Apotrechus (H–I): A–G, Apterolarnaca apta Gorochov, 2004 male (A–B, E–G) and female (C–D); H–I, Apotrechus unicolor Brunner, 1888 female.—Habitus lateral view (A, C, I), habitus dorsal view (B), female apex of abdomen with ovipositor (D), male apex of abdomen in apical (E) and lateral view (F), face (G, H). Scales 10 mm.