Orthelimaea trapezialis Liu

Liu, Chun-Xiang & Liu, Xian-Wei, 2011, Elimaea Stål (Orthoptera: Tettigoniidae: Phaneropterinae) and its relative from China, with description of twenty-three new species, Zootaxa 3020, pp. 1-48 : 46-47

Orthelimaea trapezialis Liu C-X, sp. nov. (Plate 22k, 24h–o)

Holotype: female, China: Tibet, Motuo, Maniweng, 930m, 1974. VIII.26, Coll. Huang Fusheng ( IZAS).

Paratype: China: Tibet: Motuo: 9 males, 2 females (by net), 7males, 2 females, (at light), Aniqiao, 2006. VIII.12–14, Coll. Liu Chunxiang ( IZAS); 1 male, Didong, 2006. VIII.16, Coll. Liu Chunxiang ( IZAS); 1 male (at light), Beibeng, 2006. VIII.16, Coll. Liu Chunxiang ( IZAS); 2 females, by net, Aniqiao, 500m, 2006. VIII.28, Coll. Liu Chunxiang ( IZAS).

Description: Holotype (female). Tegmen slightly surpassing apex of hind femur; hind wings slightly longer than tegmen; radius sector branching slightly before middle of tegmen, and emitting out 3 branches near apex. Fore coxae dorsally armed with a small spine. Each femur ventrally spinose; each tibia dorsally sulcate and spinose. Fore femur with 7 interior and 8 exterior ventral spines; mid femur with 10 interior and 11 exterior ventral spines; hind femur with 11 interior and 16 exterior ventral spines. Genicular lobes of each femur bispinose. Fore tibiae with 3 interior dorsal spines, 1 exterior dorsal spine over tympana, and 5 exterior dorsal spines; mid tibiae with 11 interior and 9 exterior dorsal spines; hind tibiae with 27 interior and 46 exterior dorsal spines.

Female epiproct long-triangular with approximately sharp apex. Cerci short, conial, not surpassing epiproct. Ovipositor falcate, abruptly upcurved at base, approximately matte at surface, with numerous granulates, crenulate in apical 1/3 part of ventral margin, and in apical 3/4 part of dorsal margin. Subgenital plate approximately trapziform, apical margin approximately truncated, posterior lateral corners obtusely rounded. Gonangulum semicircular, ventro-apical appendage indistinct (Plate 22k).

Male similar to female, but tegmen distinctly surpassing apex of hind femur; hind wings moderately longer than tegmen. Epiproct subquadrate, with slightly concave lateral margins, and truncated apical margin. Cerci very similar to those in Orthelimaea insignis ( Walker, 1869) , basal two thirds cylindriform, apical 1/3 part abruptly contracted into a long excavated apex (Plate 24k,o). Subgenital plate gradually narrowed, with apical 1/3 part uprightly curved; split from basal 1/3 part into two lateral lobes, which divergent at apex (Plate 24l–n).

Color: Body yellowish green (green at live). Compound eyes brown. Occiput, pronotum and legs with numerous brown spots. Tegmen yellowish green on the whole (green at live), center in cells of tegmen with numerous small brown dots. Tegminal stridulatory area with a large continuous black area.

Measurement (mm): length of body: male 21.5, female 25.0; length of pronotum: male 6.5, female 4.9; length of tegmen: male 41.0, female 36.5; width of tegmen: male 8.5, female 8.0; largest width of male stridulatory area 3.0; length of male stridulatory vein 2.5; largest width of dorsal area behind male stridulatory area 2.0; width of mirror on right tegmen 2.5; length of mirror on right tegmen 2.0; distance between basal vein of right tegmen and apex of mirror on right tegmen 3.0; length of hind wing: male 46.0, female 40.0; length of fore femur: male 10.0, female 11.0; length of mid femur: male 13.5, female 11.0; length of hind femur: male 29.5, female 28.0; length of cerci: male 3.0, female 2.0; length of subgenital plate: male 7.0, female 1.5; length of ovipositor 10.0.

Etymology: The name refers to the shape of the female subgenital plate.

Discussion: This new species has marginal distribution with Orthelimaea himalayana ( Ingrisch, 1990) ( Nepal) and Orthelimaea insignis ( Walker, 1869) ( East Bengal). From Or. himalayana Ingrisch, 1990 , which only male has been described, but it distinctly differs by the shape of the male cerci and the male subgenital plate. From Or. insignis ( Walker, 1869) , it differs by the shape of the female subgenital plate which approximately trapeziform with truncated apex, not obtusely triangular as in the latter. An additional character, the extension of a dark brown mark on the male stridulatory field that was mentioned in Ingrisch (1990) is also different from the latter two species. In this new species, the dark brown mark covers whole of the area including the stridulatory vein, which is green in Or. insignis .

Distribution: China: Tibet.