Beybienkoana formosana ( Shiraki, 1930 )

Yang, Jeng-Tze & Yang, Ching-Shan, 2012, The slim mute crickets, Euscyrtinae (Orthoptera: Grylloidea; Gryllidae; Euscyrtinae) of Taiwan with three new species and lectotype designations of three of Shiraki’s species, Zootaxa 3226, pp. 1-45 : 22-26

Beybienkoana formosana ( Shiraki, 1930)

( Fig. 13 , 14 & 15 )

Euscyrtus formosanus Shiraki, 1930 . Ins. Matsum. 4: 247. Chopard, 1968. Orth. Cat. 12: 420. Patiscus formosanus: Gorochov, 1985 . Ent. Rev. 64(1): 140.

Beybienkoana formosanus: Gorochov, 1988 . Tr. Zool. Inst. Akad. Nauk. SSR 178: 12. Patiscus formosanus: Yin et Liu, 1995 . Shanghai Sci. Tech. Liter. Pub. 118.

Coloration. Body yellowish brown with reddish brown lateral stripes, from head through eyes to tip of tegmen, without sub-lateral stripe golden yellow; vertex with 2 pairs of brown stripes, inner one light brown, outer ones reddish brown. Lateral view, eyes dark in middle. Pronotum yellowish brown, lateral areas with reddish brown along with middle line; tear like marks surrounding with dark reddish brown. Dorsal surface of hind femur marked with brown.

External morphology. Head subquadrate in dorsal view, lateral margins slightly producing laterally behind eyes; width at the level of eye equals to head width. Head distinctly longer than widest wide about 1.2:1. Frontal rostrum very long, apical margin straight, apical half narrow gradually wider and wider basally; middle ocellus elliptical, on tip of frontal rostrum; head wider than widest part of frons and wider than frontal rostrum about 10.4: 8.7: 1.0.

Eyes oval, protruding on lateral margins of vertex; eyes longer than wide about 1.5: 1, eyes shorter than head in middle long about 1:3.5; antennal scape elongate, longer than wide about 1.6: 1; Head longer than pronotum about 1.5:1, head as wide as pronotum at anterior margin; anterior margin of pronotum almost as wide as posterior.

Head in lateral view sub-triangular, dorsal margin straight, frons reclined caudo-ventrade; superior margin of antennal socket shorter than diameter of eyes about 1: 1.2; posterior margin of antennal socket foliate, anterior margin sinuate, posterior margin curved inward. Maxillary lacinia acute at apex, inner margin curved; maxillary palpi 5 segmented, 1st: 2nd: 3rd =1:2:1.6; labial palpi 3 segmented, 1st: 2nd: 3rd = 1:1:1.8. Head in anterior view polygonal, produced dorsally; frons shorter than face about 1: 2.4, shorter than mouth part about 1: 1.4; lateral margins of frons divergent ventrally; width of frons narrower at narrowest than at widest part of the level of lateral process of frons about 1: 7; lateral process of frons acute at apex reach at joint of antennal socket and eyes. Upper margin of mouth part arched upward smoothly. Clypeus broad, wide 3.6 times as long as middle long about 1:1.5; anteclypeus: labrum about 1.3:1:1.4.

Pronotum saddle-like in dorsal view, anterior margin slightly curved inward; posterior margin bi-sinuate, arched posteriorly at middle; lateral margins formed caudo-lateral angles. Pronotal disc with anterior part narrower than posterior part; middle line shorter than length at lateral margins about 1:1.1; shorter than anterior wide about 1: 1.4; posterior margin bi-sinuate, slightly curved inward at middle. Pronotal lateral lobes straight on dorsal margin, anterior running into ventral margin roundly then slowly upward dorsally; dorsal length of pronotum longer than width of widest part at level of posterior margin about 1.4: 1.

Metanotum without metanotal gland, concavity in middle and prominent borders, middle transverse ridge prominent, distinct; anterior margin of anterior concavation straight; lateral margins curved outward. Tegmen longer than wide about 3.6: 1, about 1/1.8 of body length, apex reaching at abdominal segment VII; Veins divergent laterally without stridulate organ.

Fore-tibia with tympanum on both sides, 1st tarsal segment with 3 white sac like pulvilluse, 3rd segment with pulvillus large and expanded; 3 tarsi about 1.1:1:1; inner margin of claws with spine near apex. Hind femur not reaching at abdominal terminate, femur as long as tibia; lateral spines of hind tibia i/o = 13/9, inner side 4 groups, 13 spines and (intercalary)= 9(1)2(1)1(1)1, 5 basal teeth, outer side 3 group, 9 spines and (intercalary)= 5(1)2(1)2, 16 basal teeth.

Male genitalia. In dorsal view, epiphallus elongate elliptical, anterior margin cleft at middle formed V-shape; epiphallus about 2 times of cornua. Cornua single lobe, massive, sub elliptical, about 1/3.5 of male genitalia in length, posterior margin curved inward, longer than widest wide in middle line about 1.5.

Lateral view, epiphallus and cornua long, formed rectangular; cornua with posterior margin curved upward, pointed dorsally; rami reaching at base of epiphallus, ectoparamere exposed.

Ventral view, cornua with lateral margins curved upward and mesad, dorsal area visible; ectoparamere minute, about one third of cornua, about 2.5 times as long as widest width, median lobes reaching at apex of ectoparameree. Ectoparamere semispherical, truncate at apex, inner margin straight, outer margin arched. Apodeme long, outer branch pf ectoparamere bifurcate, inner branch short contacting median lobe. Subgenital plate oval in dorsal view, longer than widest part about 2.4: 1, lateral margins curved inward, curved part about 1/2.1 of the length of subgenital plate. Distance between curved margins in nearest part closer than widest part about 1: 2.6.

Female genitalia. Ovipositor long and straight, equals to body length, sword part expanded, about 1/2.8 as long as length of ovipositor. Cross section wider than height about 2: 1.

Type materials. Lectotype: (here designated) male, “ Euscirtus formosanus nsp”; “ 10-V-1913, Horizha, col. M. Maki”; “ Type ”; “836”.

Paralectotype: female, “ Euscirtus formosanus nsp”; “ 12-IX-1910, Taipin, col. T. Shiraki”; “ Type ”; “837”.

Remarks. the specimen no. 836, head glued upside down, right hind leg lost.

Types deposited in NTUIM: Insect Museum, Department of Plant Pathology and Entomology, National Taiwan University, Taipei, Taiwan.

Habitat. habitats, vegetation under trees behind wind-break.

Host plant. Miscanthus sp.

Specimens examined. Nantou: Heisun experimental forest, 1 male (664-2), 1 female (664-1), 17-VI-1996, CS Yang. 1 male (705-5), 20VIII-1996, CS Yang. 1 male (785-12), 1 male (785-11), 18-IV-1997, CS Yang. 1 female (790-8), 25-IV-1997, CS Yang. 1 male (795-2), 1 female (795-4), 10-V-1997, CS Yang. 1 male (798-1), 3 females (798-6, 799-1, 799-2), 6-VI-1997, CS Yang. 1male (784-2), 1 female (784-9), 18-IV-1997, CS Yang. 3 males (789- 2, 789-4, 789-6), 25-IV-1997, CS Yang. 1 male (794-6), 4 females (794-1, 794-2, 794-4, 794-7), 9-V-1997, CS Yang. 4 males (806-3, 608-4, 806-6, 806-9), 2 females (806-5, 806-8), 11-VII-1997, CS Yang. 1 male (852-1), 7- XI-1997, CS Yang. 1male (791-4), 1 female (791-1), 25-IV-1997, CS Yang. Taitung: Chiban forest recreation area (119 0 43’15’’/20 0 33’05’’), 1 male (753-5), 2 females (753-13, 753-15, 753-16), 18-I-1997, CS Yang. 7 males (815- 2, 815-4, 815-7, 815-8, 815-12, 815-13, 815-14), 3 females (815-3, 815-10, 815-11), 29-VII-1997, CS Yang. Distribution. Taiwan, China.

Figures

FIGURE 13. Beybienkoana formosanus. A: head and pronotum, dorsal view; B: the same, lateral view; C: head, anterior view; D: metanotum, dorsal view; E: labium, ventral view; F: maxilla, lateral-ventral view; G: fore leg, inner side; H: fore leg, outer side; I: tarsus of fore leg, ventral view; J: hind tibia, inner side (left), outer side (right); K: fore wing, extended.

FIGURE 14. Beybienkoana formosanus. A: male genitalia, dorsal view; B: the same, ventral view; C: the same, lateral view; D: ectoparamere, ventral view; E: subgenital plate, dorsal view; F: abdominal terminal of female, lateral view; G: Ovipositor (cross section).

FIGURE 15. Beybienkoana formosanus. A: metanotum, dorsal view; B: dentate of anterior concave; C: dentate of posterior