Bolivaritettix abruptus Storozhenko, 2018

Storozhenko, Sergey Yu., 2018, Pygmy grasshoppers (Orthoptera: Tetrigidae) of Vietnam: the genus Bolivaritettix Günther, 1939, Zootaxa 4374 (4), pp. 497-523 : 514-516

Bolivaritettix abruptus Storozhenko , sp. nov.

Figs 11 , 48–54

Material examined. Holotype—female, Vietnam: Vinh Phuc Province, Tam Dao National Park , 800–900 m, 1–11 June 1995, coll. A.V. Gorochov ( ZISP). Paratypes: 1 male, same locality as for holotype, but 17–31 May 1995, coll. A.V. Gorochov ; 2 females, Thai Nguyen Province, Phu Luong District, Kuang Chu , 15 April 1986, coll. A.V. Gorochov ( ZISP). (Altogether 3 females and 1 male) .

Description. Female. Body medium-sized for this genus. Antennae filiform, 14–15-segmented, 1.5–1.6 times as long as fore femur; middle segments (seventh–ninth) 5.5–7 times as long as wide. Antennal grooves situated between lower margins of eyes. Fastigium of vertex 1.5 times as wide as one compound eye seen from above; anterior margin of vertex rounded, reaching the frontal line of eyes; lateral margins of vertex curved; median carina of fastigium distinct; transverse carinae almost reaching anteriorly the median carina; supraocular lobes vestigial; fossulae deep. Compound eyes not elevated above pronotum in lateral view. Lateral ocelli situated between lower thirds of eyes. Frontal ridge in lateral view deeply excised between lateral ocelli, angularly rounded between antennal grooves and excised below median ocellus; in frontal view, this ridge gently diverging downwards and narrow (ridge near the base of antennae as wide as first antennal segment). Pronotum in dorsal view with straight anterior margin; posterior process of pronotum narrow, surpassing apex of hind femora for 1.5–2.0 mm. Disc of pronotum behind the shoulders without depressions; posterior process of pronotum with a few irregular short ridges; apex of this process blunt. Lateral sides of shoulders rounded in dorsal view. Median carina of pronotum in profile low and almost straight. Prozonal carinae well defined, almost parallel; prozona square, as long as wide. Humero-apical carinae distinct; interhumeral carinae strong, distinctly elevated and gentle converging posteriorly. Tegminal sinus shallow; lower part of lateral lobe of pronotum in dorsal view forming obliquely truncate lobule. Infrascapular area short. Tegmina narrow with acutely rounded apex; visible part of tegmen 3.2–3.3 times as long as wide; this part of tegmen 0.7 times as wide as mid femur. Hind wings reaching the apex of posterior process of pronotum. Fore femur 3.7–3.8 times, mid femur 3.4 times as long as wide; upper and lower side of fore and mid femora weakly sinuate. Hind femur 3–3.3 times as long as wide. Upper side of hind tibia with 6 outer and 4–5 inner spines, with margins finely serrated in basal part. First tarsal segment of hind leg as long as third one; ventral side of first tarsal segment with three pads, the apical pad elongated, the basal pads short triangular; third tarsal segment not swollen. Epiproct triangular, with pointed apex. Subgenital plate 1.4 times as longs as wide; posterior margin of plate broadly rounded and with angular posterior process near middle. Cerci conical, with blunt apices, 1.8–2 times as long as wide near cercal base. Valves of ovipositor narrow, dentate; length of upper valve 3.4–3.7 times as great as its maximum width; length of lower valve 6–6.5 times as great as its maximum width.

General colouration of body dark brown. Head blackish brown with narrow light brown stripe below eyes; eyes brown. Disc of pronotum dark brown; lateral lobes blackish brown with light brown lower parts. Tegmina and hind wings black. Fore and mid femora light brown. Fore and mid tibia brown. Hind femora light brown, but the ventral external area and the lower part of median external area completely black. Hind tibiae blackish brown without distinct rings. Fore and mid legs with both tarsal segments light brown, but second segment with blackish apex; hind legs with light brown tarsal segments, but the apices of first and third segments brown. Tergites black with small brown spots; sternites, epiproct and subgenital plate blackish brown. Cerci brown. Ovipositor brown.

Male. General appearance similar to that of female. Antennae 14-segmented; 1.8 times as long as fore femur; middle segments 7–7.5 times as long as wide. Fastigium of vertex 1.6 times as wide as one compound eye seen from above; carinae of vertex as in female. First antennal segment almost as wide as frontal ridge near base of antennae. Pronotum as in female. Tegmina narrow; visible part of tegmen 3.3 times as long as wide; this part of tegmen 0.7 times as wide as mid femur. Legs as in female, but hind femur 3.1 times as long as wide. Epiproct triangular, with pointed apex. Subgenital plate 1.3 times as long as wide; its apex pointed. Cerci as in female.

General colouration of body as in female, but disc of pronotum brown. Epiproct, subgenital plate and cerci light brown.

Measurements (mm). Body: male 9.9, female 9.1–10.5; pronotum: male 11.7, female 11.2–11.4; antenna: male 3.9, female 3.6–3.7; tegmen male 1.3, female 1.3; fore femur: male 2.2, female 2.2–2.3; mid femur: male 2.4, female 2.4; hind femur: male 6.0, female 6.0–6.5; ovipositor 1.2–1.4.

Distribution. Vietnam (provinces Vinh Phuc and Thai Nguyen).

Comparison. The habitus of this new species is most similar to Bolivaritettix nilgirica (Hebard, 1930) from India and Pakistan but in the latter species the frontal ridge in profile broadly rounded between lateral ocelli, the antennal grooves situated below lower margins of eyes, and prozonal carinae distinctly constricted backwards. By narrow tegmina and relatively short pronotum B. abruptus sp. nov. is similar to B. tibetanus Zheng, 2005 and B. luchunensis Liang, 2008 from China but differs in the broader fastigium of vertex (in both above mentioned species the vertex narrow, it is as broad as one compound eye seen from above). By parallel prozonal carinae the new species similar to B. vietnamensis sp. nov. but easily recognizable from the latter in narrow tegmina and the shape of prozona. The new species is also similar to B. constrictus sp. nov., B. celaenotus , and B. similis sp. nov. in narrow tegmina but in these species the prozonal carinae distinctly constricted backwards.

Etymology. This species name is the Latin adjective “ abruptus ” (cut short).

Figures

FIGURES 5–13. Bolivaritettix, head and anterior part of pronotum, dorsal view. 5, B. sculptus, female; 6, B. vietnamensis. sp. nov., female; 7, B. chinensis, female; 8, B. humeralis, female; 9, B. anaglypticus sp. nov., female; 10, B. constrictus sp. nov., male; 11, B. abruptus sp. nov., female; 12, B. celaenotus, female; 13, B. similis sp. nov., female Scale bars 1 mm.

FIGURES 48–54. Bolivaritettix abruptus sp. nov. 48, female body, lateral view; 49, the same, dorsal view; 50, female head, frontal view; 51, female apex of abdomen, ventral view; 52, male body, lateral view; 53, the same, dorsal view; 54, male apex of abdomen,ventral view.