Stolzia vietnamensis Storozhenko, 2020

Storozhenko, S. Yu., 2020, New species of the genus Stolzia Willamse, 1930 (Orthoptera: Acrididae) from Vietnam, Far Eastern Entomologist 418, pp. 15-18 : 16-18

Stolzia vietnamensis Storozhenko , sp. n.

http://zoobank.org/NomenclaturalActs/ 7D462F43-84B4-4C4E-88D1-895A91F1DCEC

Figs 1–5

TYPE MATERIAL. Holotype – ♀, Vietnam: Dong Nai Province, Cat Tien National Park ,

3–14.XII 2010, L.N. Anisyutkin and A.E. Anichkin leg. ( ZIN).

DESCRIPTION. Female. Body robust, medium size for genus ( Figs 1, 2 ). Head rugose,

2.3 times shorter than pronotum. Face in profile strongly reclinate ( Fig. 1 ). Frontal ridge distinct almost to clypeal margin, deeply sulcate, narrowed between antennal bases and near median ocellus ( Fig. 3 ). Vertex between eyes 1.8 times broader than width of frontal ridge between antennae. Fastigium of vertex triangular, deeply sulcate; lateral margins bordered by low carinulae reaching apical margin of the compound eyes; foveolae short triangular. Eyes large, oval; vertical diameter of eye 1.8 times as long as subocular furrow. Antennae 21-seg-

mented, reaching posterior margin of pronotum; mid segments of antennae 2.3–2.4 times as long as their width. Pronotum long, rugose, crossed by three transverse furrows; prozona 1.1

times as long as metazona; anterior margin of prozona almost straight; posterior margin of metazona triangularly rounded; lateral and median carinae vestigial ( Fig. 2 ). Prosternal spine short, straight, conical, with pointed apex. Mesosternal lobes subsquare, 1.2 times as wide as long; mesosternal interspace transverse, 1.5 times as wide as long; metasternal lobes widely separated. Tegmina touching each other in a resting position, reaching knees of hind femora,

with rounded apex. Hind wings in a rest position as long as tegmina. Hind femora stout, 3.1

times as long as their maximal width; dorso-median carina slightly serrated; apex of ventral genicular lobes triangle rounded ( Fig. 1 ). Hind tibiae with 9 outer and 9 inner dorsal spines;

outer apical dorsal spine present. Hind tarsi short, not longer than the half of hind tibiae; third segment (without claws) almost as long as two others together; arolium large. Tympanum large, oval. Supra-anal plate elongated, as long as its width near base, with a lingua-like apex and a transverse sulcus in the middle; median longitudinal sulcus deep but narrow. Cerci conical with pointed apex, 1.7 times as long as their width near base. Subgenital plate elongated,

1.2 times as long as wide, posterior margin narrowly triangular; middle concavity excised with sharp tooth on both sides of this concavity ( Fig. 5 ). Basivalvular plates wide. Ovipositor short; dorsal valves shorter than lower ones, widened apically, dentate only at apex; ventral valves slightly curved and also dentate only at apex ( Fig. 4 ).

Body brown with black marks. Dorsal side of head light brown with two lateral black stripes; fastigium of vertex light brown; foveolae black. Upper part of genae light brown:

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lower part blackish. Face, clypeus and labrum light brown; eyes blackish. The base and apex of antennae whitish brown, central part bkackish brown. Disc of pronotum light brown; upper part of lateral lobes brown, lower part blackish with two pale brown spots. Sternal plate brown, with a few black spots. Tegmina light brown, with broad black stripe along lower

(anterior) margin. Hind wings hyalines, apical part blackish, and apex black. Fore and mid view; 3 – head, frontal view; 4 – apex of abdomen, lateral view; 5 – the same, ventral view.

legs yellowish brown. Hind femur light brown, without any dark marks; genicular lobes black. Hind tibia black with yellowish ring near the base. Tarsi light brown; claws with black apex. Abdomen dorsally brown with black median stripe; 10th tergite, supra-anal plate and cerci light brown. Abdomen ventrally light brown with black median stripe; subgenital plate black. Ovipositor light brown; apical teeth black.

Male unknown.

MEASUREMENTS (length in mm). Body – 16.2; antenna – 10.5; pronotum – 6.1;

tegmen – 12.5; hind femur – 10.7; hind tibia – 9.0; ovipositor – 2.1.

DISTRIBUTION. South Vietnam: Dong Nai Province.

COMPARISON. The new species from Vietnam is similar to congeners distributed in adjacent countries (Willemse, 1939; Tinkham, 1940; Zheng & Ma, 1989) but distinguishes from these species by the color of body and appendages. In S. flavomaculata from Malaysia

(Dinding, a small island southwest of Pangkor Island) hind femur olivaceous brown or yellow, genicular lobes reddish brown and hind tibia olivaceous green with narrow pale yellow ring near the base; in male of S. jianfengensis from South China (Hainan Island:

Jianfengling) hind femur green and only the base of hind tibia black; in male of S. hainanensis from South China (Hainan Island: Ta Hian) hind femur golden yellow and genicular lobes reddish brown.

Figures

Figs 1–5. Stolzia vietnamensis sp. n., female. 1 – body, lateral view; 2 – the same, dorsal