Hyboella perakensis Günther, 1939

Storozhenko, Sergey Yu., 2022, The genus Hyboella Hancock, 1915 (Orthoptera: Tetrigidae: Metrodorinae) in Indonesia, Zootaxa 5195 (2), pp. 179-186 : 180-182

Hyboella perakensis Günther, 1939

Figs. 1–8

Hyboella perakensis Günther, 1939: 218 , figs. 146, 147 (holotype – female, Malaysia: Malacca area, watershed between Perak and Pahang; in ZMUH); Blackith, 1992: 94; Otte, 1997: 83; Dey & Husemann, 2018: 27.

Material examined. Indonesia: Java, 20-25 km SE Bogor city, Mts. Pangrango, vil. Cemande , 1000 m, tropical forest, 27.XI–7.XII 1999, 1 female, leg. A.V. Gorochov ( FCBV) ; West Java, Sukabumi, Situ Gunung (Gede-Pangrango Nat. Res.), 11–12.IV 2003, 1 male, 3 females, leg. M.V. Berezin ( ZIN) .

Remarks. Females from Java well agrees with the original description of Hyboella perakensis from Malay Peninsula and images of the holotype available in OSF (http://orthoptera.speciesfile.org/Common/specimen/ ShowSpecimen.aspx?SpecimenID=48117). Indonesian females are slightly smaller than continental ones but undoubtedly belong to the same species. The description of unknown male and redescription of female based on specimens from Java are given below.

Redescription of female. Body robust, medium sized for genus.Antennae filiform, 15–16-segmented; antennal grooves situated at the level of lower margin of eyes. Length of antenna 1.3–1.4 times longer than length of fore femur; mid segments of antennae 5.0–5.7 times as long as wide. Eyes not protruding above vertex in lateral view. Lateral ocelli placed slightly below the middle of eyes. Fastigium of vertex with deep concavities between lateral carinae, reaching the front of eyes from dorsal aspect, 2.2–2.3 times wider than width of one eye from above; anterior margin of fastigium almost straight, median carina of fastigium short; lateral carinae low. Frontal ridge in lateral view rounded. Width of frontal ridge near base of antennae almost equal to width of 1st antennal segment. Pronotum rugulose, reaching apex of abdomen; in dorsal view anterior margin of pronotum almost straight in the middle; posterior process of pronotum in dorsal view broad with narrow rounded apex. In profile, median carina of the pronotum raised before shoulders and strongly decries behind shoulders. Prozonal carinae well defined, constricted backwards. Hind margin of lateral lobes of the pronotum with both tegminal and lower sinus; posterior angles of lateral lobes in dorsal view broadly rounded. Tegmina present; visible part of tegmen narrow. Hind wings abbreviated, only reaching second abdominal tergite. Fore and mid femora with weakly sinuate upper and lower carinae. Fore femur 4.3–4.4 times, mid femur 4.0–4.1 times as long as wide. Hind femur stout, 2.6 times as long as wide; upper carina weakly sinuate, lower carina almost smooth. Upper side of hind tibia with 7–9 outer and 4–5 inner teeth. First tarsal segment of hind legs 2.0–2.1 times longer than 3rd segment (without claws). Subgenital plate as long as wide; posterior margin of plate broadly rounded and with angular posterior process near middle. Cerci conical, with pointed apex. Valves of ovipositor narrow, dentate. Upper valve of ovipositor 4.2–4.4 times longer than its maximum width. Lower valve of ovipositor 6.3 times longer than its maximum width.

Body blackish brown. Head dark brown. Antennae light brown with blackish apex. Maxillary palps brown. Dorsal side of pronotun blackish brown with light brown apex of posterior process. Fore and mid femora blackish brown. Fore and mid tibiae blackish brown, with three light brown rings. Fore and mid tarsi blackish brown, second segment with light brown base and blackish apex; claws brown. Hind femora, tibiae and tarsi dark brown. Abdomen brownish with black marks. Ovipositor light brown.

Description of hitherto unknown male. Similar to female but smaller. Antennae 15-segmented; length of antenna 1.5 times longer than length of fore femur; mid segments of antennae 5.7–5.8 times as long as wide. Fastigium of vertex 2.1 times wider than width of one eye from above. Width of frontal ridge near the base of antennae almost equal to width of 1st antennal segment. Pronotum, tegmina and hind wings as in female. Fore and mid femora 3.3 times as long as wide; upper and lower carinae almost smooth. Hind femur 2.7 times as long as wide. Upper side of hind tibia with 9 outer and 6 inner teeth. First tarsal segment of hind legs 2.1 times longer than 3rd segment (without claws). Epiproct narrow triangular, with pointed apex. Subgenital plate in lateral view elongated with excised apex; in ventral view apex of plate rounded. Cerci short, conical, with pointed apex.

Body coloured as in female but fore and mid tibiae completely black, hind tibia light brown, and subgenital plate blackish brown.

Measurements (in mm). Length of body (from frontal ridge to apex of subgenital plate) male 11.6, female 14.0–14.5; pronotum male 10.1, female 12.5–12.6; antenna male 3.6, female 4.2–4.3; fore femur male 2.4, female 3.0–3.1; mid femur male 2.7, female 3.2–3.3; hind femur male 7.5, female 8.9–9.0; ovipositor 2.2–2.4.

Distribution. Malaysia (Malay Peninsula). Here it is recorded from Indonesia (Java Island) for the first time.

Figures

FIGURES 1–8. Hyboella perakensis Günther, 1939 female (1–4) and male (5–8) from Java. 1, 5 habitus, lateral; 2, 6 habitus, dorsal; 3, 7 head, anterior; 4, 8 apex of abdomen, ventral. Scale bars = 1 mm.