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A New Genus Speciesof Mogoplistidae (Orthoptera,Grylloidea)From the Ryukyus

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A New Genus Speciesof Mogoplistidae (Orthoptera,Grylloidea)From the Ryukyus JapaneseJapaneseSociety Society ofSystematicof Systematic Zoology Proc.Jap. Soe. syst. Zoel., No. 31; 44-49. Deeernber 25, 1985. A New Genus and Species of Mogoplistidae (Orthoptera, Grylloidea) from the Ryukyus Tsukan6 YAMASAKI Synopsis YAMAsAKI, T. 1985 A new genus and speeies of Mogoplistidae <Orthop- tera, Grylloiclea) from the Ryukyus, Proc. Ja･p. Sec. syst. Zool., Tokyo, No. 31: 44-49. is described under the name of A new mogoplistid genus and speeies Tttba?"ama･ iriomoteo'i･mana･ from the Island of ITiomote-jima in the Ryukyu Islands. The new genus Tubara7n- is very elosely related to the Australian Iatter by the genus Kialt-, but the former is slightly distinguished from the ratios of pronotal Iength to exposed fore wing length and of the 5th segment length to its width in maxillary palp. In addition to these, the former oecurs in Ieaf litter on dark ground in coastal forests, while the latter does in grassy, slightly wooded plains. Most mogoplistid crickets dwell on foliage of bushes and small trees. However, sorne mogoplistids are terrestrial and prefer to live in leaf litter, e.g. American CycloptiZz{m and Australian Marimza, Biama and Kalyra (LovE and WALKER, 1979; OTTE and ALExANDER, 1983). Of these, several species have strong preference to eoastal habitats (LovE and WALKER, op. ci,t.). A new rnogoplistid species from the Island of Iriomote-jima of the Yaeyama group in the Ryukyu Islands, which will be deseribed in the present paper, also has such peeuliar habit. This new speeies is similar to the Australian Kiah in having entirely blaek exposed fore wings. However, the former slightly differs from the latter in relative size of body paTts. Further, Kiah oceurs in grassy, slightly wooded plains (OTTE and ALExANDER, op. eit.). For the present, therefore, I take the step of deseribing the new species under a new genus. All the type specimens here designated are deposited in the Na- tional Science Museum (Nat. Hist.), Tokyo. Before going further, I wish to express my sincere thanks to Mr. M. ToMoKuNI for his kind aid in the field survev. v Genus Titbarama nov. Tupe species: Tztba7"a7na iriomoteiimana YAMAsAKI, sp. nov. Closely related to Kiah OTTE et ALExANDER, 1983, but differs at NII-Electronic Library Service JapaneseJapaneseSociety Society ofSystematicof Systematic Zoology New Mogeplistid from the Ryukyus 45 the least in the ratios of the 5th segment length to its width in maxillary palp and of pronotal length to exposed fore wing length in male. Male reeognized on the following characteristics: Body length, 4.9-6.6 mm. Ratio of 5th segment Iength to its width in maxillary palp, ea, 2.5. Ratio of pronotal length to exposed fore wing length, 4.75-9.50. Head and pronotum with striped or complieated pattern by white seales. Fore wings short, entirely blaek in exposed pertions; mirror concealed ,beneath the pronotum in anterior half. Legs short ; fore tibiae with a small internal tympanum; hind femora blackish, but inner basal halves whitish and dorsal!y with whitish spots bearing a bristle. Abdominal segments grey, dorsally with 4 blackish spots in each segment except for the last white segment. Cerci banded, mostly black; bases and apices white. Genital processes pale brown. Inhabitant in leaf litter on the ground in coastal forests. Range. Known so far only from the Island of Iriomote-jima, the Ryukyu Islands. "Tubarama" Etymology. is a kind of lyrical ballad of short verse type sung by people in the Yaeyama group of the Ryukyu Islands, though "tubara" the word originally means a young man in the Yaeyama dialect "-ma" and is suthxed to the attribution of diminuitive loveliness (KisHABA, 1924). On the other hand, the mogoplistid belonging to the genus is small in body size and the male singsa lovely short song. There- fore, Tzebara･ma is the well suited name to the member of the new genus. Tubarama iriomotojimana YAMASAKI, sp. nov. (Figs. 1-13) Male. Body length, ca. 4.9-6.5 (5.55 in holotype) mm; head width (extraocular distanee), 1.40-1.51 (1.51) mm; rostral Iength, O.18-O.25 (O.20) mm, rostral width, O.45-O.5e (O.50) mm ; antennal length, ca. 6.7-ca. 7.5 (ea.6.7)mm; pronotal length, 1.8-1.9 (1.9)mm, pronotal width (maximum), 1.7-1.9 (1.9) mm; fore wing length (exposed part), O.2-O.5 (O.3) mm; abdominal width (maximum), 1.8-2.4 (2.4) mrn; hind femoral Iength, 3.1-3.5 (3.3)mm, hind femoral width (maximum), 1.2-1.3 (1.3) mm; hind tibial length, 2.1-2.5 (2.3) mm; cercal Iength, 2.45-2.70 (2.70) mm Colour dark with whitish stripes in grey, head and pronotum. Exposed fore wings entirely blaek. -13 Body (Figs. 1 and a) small for a mogoplistid. Head (Figs. 1-2) short; rostrum, seen from above, blaek and shiny without any bristle, wider than the lst antennal segment; oceiput with NII-Electronic Library Service JapaneseJapaneseSociety Society ofSystematicof Systematic Zoology 46 T. Yamasaki five stripes by white scales. Antennae dark brownish, rather short. Face near the mid-lower (Fig. 4) blaek or blackish, with a whitish spot times as margin of rostrum. Maxillary palpi blaekish; 5th segment 2.5 long as wide. Pronotum becoming wider posteriorly; anterior margin slightly incurved and posterior margin round; lateral lobes (Fig. 2) black, with bristles along the margin; dise (Fig. 1) with a complieated pattern by whitish scales and with a white broad band along the posterior margin. half and Fore wings (Fig. 5> short but wide, whit･ish in anterior black in posterior half; apices round and extending to the anterior part of the 2nd abdeminal segment: stridulatory, diagonal and three harp veins and transformed circular mirror reeognized. File with 77 teeth in one of the paratypes. almost blackish but All legs with bristles. Fore and middle legs tibiae black and apices of femora, bases and apiees of tibiae and bases of metatarsi whitish. Hind !egs rather short; posterior femora blackish on outer surface and in apical half of inner surface, but basal half of pr･-Ei(ll).,,,. 'N i ･yf " / / xX fe im Esk,,S, x g git$･ 6emp S 3 - Figs. 1-3. Tubarama irio?notej'itnana YAMAsAKI, sp. nov. 1. Holotype male. 2. Male head, pronotum and fore wings, lateral view. 3. Female head and pronotum, dorsal view. Scale 1mm. NII-Electronic Library Service JapaneseJapaneseSociety Society ofSystematicof Systematic Zoology NewMogoplistidfrom the Ryul<yus 47 --tw-.. tViV( ,･3,ttt--''i'4b ;t, ''f x 8 4 6 9 10 f.t x. t, ' .d ' x y 7 11 ----7- 12 t .,, C l i) y ,--= ' Figs. 4-12. 1'u･barama zTomotej'iwzana YAMAsAKI, sp. nov. 4. Male faee, frontal view. 5. Male fore wings in situ, dorsal view. d: right, s: Ieft. a and '8. 7. Male abdominal ends (6: holotype). Male subgenital plate, ventral view. 9 and 10, Genital proeesses, ventral (9) and lateral (10) views. 11. Female subgenital plate, 12. 0vipositor. Seales 1mm: a is for Fig. 5, b for others. inner surfaee is whitish, and dorsal blackish areas with ca. 10 whitish spots bearing a black bristle; apices of femora and bases of tibiae pale brownish; tibiae blaek excepting the base, apical spurs slightly curved and inner lower spurs the longest. Abdomen grey, dorsally with 4 blackish spots bearing a blackish bristle and laterally with triangular black spots on each segment ex- eepting 9th and 10th segments; ventral surface of the abdomen dark, becoming more blackish in terminal segments. Tenth tergite (Figs. 6-7) whitish, with many Iong hairs. Subgenital plate (Fig. 8) round in margin posterior but slightly ineurved at the middle. Cerci rather short, banded by blackish colour; bases and apices white. Genital pro- eesses (Figs. 9: ventral and 10: lateral) pale but brownish with paler ventro-apieal parts. Fema･le. Body length, 5.6-6.6 (6.3 in allotype) mm; head width (extraocular distance), 1.44-1.60 (1.60) mm; rostral Iength, O.15-O.20 (O.20) mm, rostral width, O.42-O.55 (O.55) mm; antennal length, ca. 6.5- 7.2 (ca.6.5) mm; pronotal length, 1.2-1.4 (1.4) mm, pronotal width (maxirnum), 1.6-1.9 (1.9)mm; abdominal width (maximum), 2.05- 2.80 mm; hind femoral length, 3.4-3.9 mm; hind (2.80) (3.9) femoral NII-Electronic Library Service JapaneseJapaneseSoclety Society ofSystematicof Systematic Zoology 48 T. Yamasaki width (maximum), 1.3-1.5 (1.5) mm; hind tibial length, 2.1-2.5 (2.4) mm; cercal length, 2.9-3.6 (3.3) mm; ovipositor Iength, 2.1-2.5 (2.1) mm. Colour similar to that in the male, but more brownish in paler areas. Body (Figs. 3 and 13b) a little larger than in the male. Pronotum (Fig. 3) shorter than that of the male, becoming wider to the middle; colour pattern more simple than in the male; anterior margin slightly incurved, posterior margin almost straight and lateral margins almost parallel in the posterior half. All tibiae black, but internally with a whitish wide band at the middle. Abdomen dark grey dorsally, especially in lst and 2nd segments, with 4 small blackish spots bearing a blackish bristle; ventral surface of abdomen blaekish. Cerci palely banded in general. Subgenital plate as shown in Fig. 11; posterior margin round but roundly ineurved in the eentral portion. Ovipositor (Fig. 12) short and straight, almost equal to hind tibial length, pale brown and with brownish apex. Song.
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