Beybienkoana splendida Yang and Yang

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 : 31-36

Beybienkoana splendida Yang and Yang , n. sp.

( Fig. 19 , 20 & 21 )

Coloration. Body yellowish brown with reddish brown lateral stripes, from head through eyes to tip of tegmen, with sub-lateral stripe golden yellow; vertex with 3 pairs of brown stripes, middle one redish brown, inner and outer ones light brown. Lateral view, eyes dark in middle, upper part milky white, lower part two-layers, white over dark. Pronotum yellowish brown, lateral areas with reddish brown along with middle line; tear like marks golden yellow 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 about 1.1: 1. Head distinctly longer than widest wide about 1.2:1. Frontal rostrum very long, apical margin straight, apical half narrow, suddeny wider before eyes; head wider than widest part of frons and wider than frontal rostrum about 9.8: 6.5: 1.0. Eyes oval, protruding on lateral margins of vertex; eyes longer than wide about 1.6: 1, eyes shorter than head in middle long about 1:3; 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, narrower than anterior margin of pronotum about 1:1.2. Head in lateral view sub-triangular, dorsal margin straight, frons reclined caudo-ventrad; superior margin of antennal socket shorter than diameter of eyes about 1: 1.1; posterior margin of antennal socket foliate, anterior margin sinuate, posterior margin curved inward. Maxillary with lacinia acute at apex, inner margin curved; maxillary palpi with 1st: 2nd: 3rd =1:2:2; labial palpi, 1st: 2nd: 3rd = 1.2:1:1.3.

Head in anterior view polygonal, frons 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: 7.5; 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, wider than middle long about 1.6: 1; mouth part longer than widest part about 1:1.5; width of ante-clypeus: labrum: post clypeus about 1.5:1:1.2.

Pronotum saddle-shaped in dorsal view, anterior margin slightly curved inward; lateral margins formed caudo-lateral angles. Pronotal disc with anterior portion narrower than posterior portion; middle line shorter than length at lateral margins about 1:1.2; shorter than anterior width, about 1: 1.3; posterior margin bi-sinuate, slightly curved inward at middle. Pronotal lateral lobes straight on dorsal margin, anterior rounding into ventral margin then slowly upward dorsally; dorsal length of pronotum longer than width of widest part at level of posterior margin about 1.3: 1. Metanotum with metanotal gland, concavity in the middle and prominent margins, middle transverse ridge prominent; anterior margin of anterior concavity straight; lateral margin slightly curved outward; posterior margin arched inward; concavity quadrate equally in length; anterior margin of posterior concavation curved and mosaic with posterior margin of anterior concavity.

Tegmen longer than wide, about 3.5: 1, about 1: 1.6 of body length, apex reaching at abdominal segment VII; Veins divergent laterally at level of middle; tegmen without stridulate organ.

Fore-tibia with tympanum on both sides, inner one longer than outer one about 1.3: 1; 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 at apex. Hind femur not reaching at abdominal tip, femur as long as tibia; lateral spines i/o = 15/9, inner side 4 groups, 15 spines and (intercalary)= 12(1)1(2)1(1)1, 5 basal teeth, outer side 5 group, 12 spines and (intercalary)= 5(1)4(1)1(3)1(4)1, 12 basal teeth.

Male genitalia. In dorsal view, epiphallus elongate elliptical, anterior margin cleft at middle formed V-shape; epiphallus about 2.1 times longer than cornua. Cornua single lobe, massive, sub elliptical, about 1/3.4 of male genitalia in length, posterior margin curved inward, longer than widest wide in middle line about 1.8. Epiphallus in lateral view with cornua long, forming rectangular bar; cornua curved upward; 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 eighth of cornua, about 2.9 times as long as widest width, median lobes reaching at apex of ectoparamere. Apodeme long, biforked outer branch long contact ectoparamere, inner apodeme short contact median lobe basally.

Subgenital plate oval in dorsal view, longer than widest part about 2.5: 1, lateral margins curved inward, curved part about 1/1.6 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, equal to body length, upward at base then downward at apical part; sword part expanded, about 1/2.5 as long as length of ovipositor. Cross section wider than height about 1.3: 1.

Characters n Min.(mm) Max.(mm) Mean± SD (mm) CV (%) Male 5

Body length 15.90 16.01 15.95 ± 0.05 0.31 Head length 2.22 2.46 2.39 ± 0.11 4.60 Head width 1.95 2.07 2.01 ± 0.06 2.99 Pronotum length 1.42 1.57 1.56 ± 0.06 3.85 Pronotum width 1.93 2.02 1.97 ± 0.03 1.52 Fore-wing length 8.84 9.29 9.55 ±0.21 2.20 Fore-femur length 2.13 2.41 2.22 ± 0.12 5.41 Fore-tibia length 2.10 2.23 2.17 ± 0.06 2.77 Hind-femur length 8.50 9.69 9.27 ± 0.56 6.04 Hind-femur width 1.49 1.58 1.53 ± 1.40 9.15 Female 5

Body length 14.62 15.65 15.17 ± 0.43 2.83 Ovipositor length 15.00 15.97 15.41 ± 0.44 2.86 Habitat. roadside vegetation, under trees, behind wind-break. Host plant. Miscanthus sp.

Type materials. Holotype: Male (815-9), Taitung, Chiban forest recreation area (119 0 43’15’’/20 0 33’05’’), 29- VII-1997, CS Yang.

Paratypes: Pingtung: Li Der, Lanjen Shi, 1 female (771-1), 1-IV-1997, CS Yang. Kenting, Guan Shan (120 0 43’33’’/21 0 58’20’’), 1 male (815-9), 29-VII-1997, CS Yang. Kenting forest recreation area (120 0 47’53’’/ 21 0 56’58’’), 4 males (848-2, 848-5, 848-8, 848-10, 848-13), 2 females (848-9, 848-12), 24-X-1997, CS Yang. Tai Rd #26 (34Km), 1 male (849-1) 24-X-1997, CS Yang. Taitung: Chiban forest recreation area (119 0 43’15’’/ 20 0 33’05’’), 2 females (815-5, 815-16), 29-VII-1997, CS Yang.

Type deposited in NCHU: Department of Entomology, National Chung Hsing University, Taichung, Taiwan.

Distribution. Taiwan.

Etymology. splendidus , -a, -um. Latin, adj. bright, the lateral stripe in light color.

Remarks. B. splendida similar to B. formosanus ( Shiraki, 1930) in features, but different from latter one by the followings:

1. The frontal rostrum narrower than wide at lateral process about 1: 1.65 of B. splendida but is 1: 1.87 of B. formosanus .

2. The vertex with 3 pairs of brownish stripes; lateral stripe golden yellow, distinctly.

Figures

FIGURE 19. Beybienkoana splendidus. 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 20. Beybienkoana splendidus. 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 21. Beybienkoana splendidus. A: metanotum, dorsal view; B: dentate of anterior concave; C: dentate of posterior concave; D: anterior lateral margin.