Larnaca (Larnaca) eugenii (Griffini, 1914b) comb. nov.

Figs. 1A, 71 D–G, 72E–H

Gryllacris eugenii Griffini, 1914b

Metriogryllacris eugenii Jin, Xingbao & K.- L. Xia. 1994

Material examined. Vietnam: Tonkin, Lang Son Province, Than-Moi (currently Dong Mo), (21°33'N, 107°1'E), 1.vi.–31.vii.1892, leg. H. Fruhstorfer— 1 male (holotype) (Wien NHMW) ; Tay Yen Tu Nat. Res., (21°11'10''N, 106°43'25''E), 7–11.vii.2013, leg. J. Constant & J. Bresseel (I.G. 32.454)— 1 male (Brussels RBINS) .

Diagnosis. The stout body, the parallel and equidistant veins of the tegmen and especially the shape of the ninth abdominal tergite with the typical projections proof that the species should be assigned to the genus Larnaca sensu stricto . The specimen from Tay Yen Tu differs from the holotype of L. eugenii only in a little less extended black pattern on pronotum. The main veins of both tegmina are all undivided in the type while in the specimen from Tay Yen Tu, media anterior is divided in apical half on the left but not on the right tegmen.

L. eugenii differs form L. vietnamensis Gorochov, 2003, only known from a female, in color patterns of face and pronotum; from L. nigricornis sp. nov. it differs by shape of process of the ninth abdominal tergite, slight difference in shape of tip of subgenital plate and color pattern: pronotum without black marks except for black rim, femora of all legs without black marks except for hind knee.

Description. Rather short and stout species. Head: Face ovoid, wide; forehead with transverse riffles and scattered impressed dots; fastigium verticis wider than scapus, ocelli distinct; fastigium frontis separated from fastigium verticis by a very fine suture; subocular furrows distinct (Fig. 71E, G). Abdominal tergites two and three without stridulatory pegs.

Wings: Wings covering abdomen and reaching hind knees; not fully covering abdomen in type (Fig. 71D). venation of tegmen (Figs. 1A, 71F): apart from the two subcostal veins, with nine full length veins without branching and in sub-equal distance from each other, plus a shorter vein before hind margin.

Legs: Fore coxa with a 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 13–15 external and 14 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.

Coloration of type: General color yellowish brown with black ornaments; rim and some scattered marks of pronotum and antennae black. Face reddish brown; fastigium verticis and fastigium frontis black with yellow ocelli; base of antennae, labrum, and mandibles also black; clypeus pale yellow with dark brown spots. Tegmen reddish brown, tip transparent with reddish brown veins.

Coloration of specimen from Tay Yen Tu: General color brown with black marks; pronotum brown with black margin; genicular area of hind leg with black ornament, hind tibiae with black dorsal band and black spines; fore tibiae and all tarsi with black lateral bands. Face red brown with a black band between compound eyes including antennal scrobae and base of antennae; ocelli light orange; clypeus black on both sides but very lateral margin white, in middle orange to yellow; labrum and mandibles black. Tegmen orange brown, at tip semi-transparent white, with a small black spot at base, veins brown, darker towards base; hind wing semi-transparent white, main veins blackish, cross-veins dark grey.

Male. Eighth abdominal tergite prolonged. Ninth abdominal tergite globular, furrowed along midline; in apical area with an oval swelling on both sides of midline prolonged at ventro-medial angle into a compressed process faintly curved proximad, with finely granular, subobtuse or subacute tip (Figs. 72 E–G). Subgenital plate wider than long; in about basal half with slightly diverging margins, in about mid-length on both sides with a transverse furrow (in type distinct, in male from Tay Yen Tu faint), not reaching central area of plate; apical margin oblique on both sides and with a distinct, rounded notch in middle; curved and conical styli inserted at apico-lateral angles, largely surpassing tip of subgenital plate (Fig. 72H).

Female unknown.

Measurements of type after Griffini 1930 (1 male).—body w/o wings: 35; pronotum: 7.4; tegmen: 21.3; hind femur: 17.8 mm.

Measurements (1 male).—body w/wings: 32; body w/o wings: 27; pronotum: 7.8; tegmen: 22.5; tegmen width: 8.5; hind femur: 16; antenna: 110 mm.