Pseudoxistrella belokobylskii Storozhenko et Omelko

Yu, Sergey & Omelko, Mikhail M., 2012, Review of the genus Pseudoxistrella Liang, 1991 (Orthoptera: Tetrigidae, Metrodorinae), Zootaxa 3573, pp. 59-65 : 60-62

Pseudoxistrella belokobylskii Storozhenko et Omelko , sp. nov.

Figs. 1–15

Material examined. Holotype—male, Vietnam: Hoa Binh Province, Yen Thuy district, Lac Thinh, 20o23’N, 105o34’E, 300 m, 1–2.V 2002 (S. Belokobylskij). Paratypes: the same data as in holotype, 1 male, 2 female (S. Belokobylskij); Hoa Binh Province, Mai Châu, 31.X 1990, 1 male (S. Belokobylskij).

Description. Male. Body medium sized for genus. Fastigium of vertex measured near anterior margin of eyes 1.6–1.7 times narrower than width of one eye from above. Length of median carina of frontal ridge 1.1–1.25 times longer than width of 1st antennal segment. Antennae elongated, mid segments (8th–10th) narrow, 14.5–18 times as long as wide. Median carina of pronotum in profile low, almost straight. Lateral carinae in prozona well defined; prozona transverse, its width 1.2 times more than its length. Dorsal side of pronotum between shoulders with a pair of short oblique carinulae reaching the mid of tegmen. Tegmina ovate, visible part of tegmen 2.6–2.9 times as long as wide; hind wings long, with scalloped inner margin. Fore femur 7.3–8.5 times, mid femur 6.2–6.4, hind femur 3.9–4.1 times as long as wide. First segment of fore legs 1.2 times shorter than second segment (without claws) and 2.2 times as wide as second segment. Upper side of hind tibia with 5–7 outer and 5–6 inner teeth. Two basal pads of first tarsal segment of hind legs distinctly larger than apical pad. Epiproct narrow triangular, with pointed apex. Subgenital plate in ventral view 1.4–1.5 times as long as wide. Cerci with pointed apex, 1.7 times as long as wide near the base.

General coloration of male body greenish. Head olive-green; eyes brown; 1st–10th segments of antennae greenish brown, basal part of 11th segment white, apical part of 11th segment and 12th–14th segments black. Disc of pronotum and upper part of lateral lobes dark green, lower part of lateral lobes of pronotum olive-green. Legs olive-green; apex of 1st and 2nd tarsal segments of fore and mid legs blackish; hind femora with few indistinct dark spots on lower side; basal 2/3 of hind tibiae olive-green, apical 1/3 yellowish brown. Tegmina black, with yellowish longitudinal stripe near the base and whitish spot at apex. Hind wings hyaline, with narrow blackish stripe around anterior and posterior margins. Abdomen olive-green, from above with blackish longitudinal stripe. Epiproct and dorsal side of subgenital plate black; cerci brown.

Female similar to male. Fastigium of vertex measured near anterior margin of eyes 1.4–1.6 times narrower than width of one eye from above. Length of median carina of frontal ridge 1.2 times longer than width of 1st antennal segment. Antennae elongated, mid (8th–10th) segments of antennae 14.1–19.4 times as long as wide. Median and lateral carinae of pronotum as in male; prozona transverse, width of prozona 1.1–1.4 times more than its length; a pair of short oblique carinulae between shoulders well defined.Visible part of tegmen 2.4–2.6 times as long as wide; hind wings as in male. Fore femur 7–7.6 times, mid femur 6.2–7.1, hind femur 3.7–3.8 times as long as wide. First segment of fore legs 1.1–1.2 times shorter than second segment (without claws) and 3 times as wide as second segment. Upper side of hind tibia with 5–6 outer and 6 inner teeth. Pads of first tarsal segment of hind legs as in male. Epiproct narrowly triangular, with pointed apex. Subgenital plate square, with angularly pointed posterior margin. Cerci with pointed apex, 2 times as long as wide near the base. Upper valve of ovipositor 3.8 times longer than its maximum width. Lower valve of ovipositor 5.8 times longer than its maximum width.

General coloration as in male, but lower part of lateral lobes of pronotum dark green and lower side of hind femora blackish. Ovipositor light brown.

Measurements (in mm). Length of body (from the anterior margin of head to the apex of abdomen) male 10.2–10.8, female 12.0–12.5; antenna male 8.1–8.4, female 9.0–9.2; pronotum male 15.8–17.0, female 15.6–17.4; tegmen male 1.8–2.0, female 2.1–2.2; hind wingmale 13.5–14.0, female 14.0–14.5; fore femur male 3.3–3.4, female 3.5–3.8; hind femur male 7.4–7.6, female 8.2–8.4; ovipositor 1.8–2.0.

Diagnosis. New species differs from the type species of genus by characters given in the key above.

Distribution. Vietnam: Hoa Binh Province ( Fig. 16 , a).

Ethymology. The species is named in honor of famous Russian entomologist Dr. Sergey Belokobylskij (St.- Petersburg), who collected all type specimens in Vietnam.

Figures

FIGURES 1 – 4. Pseudoxistrella belokobylskii sp. nov. 1, male head and pronotum, dorsal view; 2, male antenna, dorsal view; 3, male head and anterior part of pronotum, dorsal view; 4, male head, frontal view. Scale bars 1 mm.

FIGURES 5 – 12. Pseudoxistrella belokobylskii sp. nov. 5, male fore leg, lateral view; 6, male fore tarsus, dorsal view; 7, the same, ventral view; 8, male hind leg, lateral view; 9, male head and anterior part of pronotum, lateral view; 10, male apex of abdomen, lateral view; 11, female apex of abdomen, lateral view; 12, the same, ventral view. Scale bars 1 mm.

FIGURES 13 – 16. Pseudoxistrella belokobylskii sp. nov. 13, male body, lateral view; 6, female body, dorsal view; 15, female hind wing, dorsal view; 16, distribution-map of Pseudoxistrella (a— P. belokobylskii sp. nov., b— P. eurymera Liang, 1991).