Leuconemacris xinlongensis, Mao & Huang, 2023

Mao, Ben-Yong & Huang, Zhi-Pang, 2023, Taxonomy on three allied genera within Arcypterini (Orthoptera: Acrididae) from Qinghai-Xizang Plateau, China, Zootaxa 5239 (2), pp. 265-279 : 271-272

Leuconemacris xinlongensis , sp. nov. ( Figs 11–15 , 30–31 )

Description. Male. Small size.

Head. Head longer, 1.10 times as long as pronotum; frons slightly oblique in lateral view; fastigium triangular, apex acutely angular, dorsum weakly depressed with distinct median and lateral carinae, median carina continuing to half of occiput; vertex between eyes 1.6–1.7 times as wide as frontal costa between antennae; frontal costa broad and flat but finely depressed around median ocellus, lateral margins parallel but weakly contracted near median ocellus. Antennae short and thick, 20 segments, not reaching hind margin of pronotum, median segment (9 th –13 th) mean 0.8 times as long as wide. Eyes roundly triangular, longitudinal diameter 1.1 times horizontal one and 1.0–1.1 times the length of subocular furrow.

Thorax. Pronotum with anteral margin straight, posteral margin with a small median notch; median and lateral carinae distinct, lateral carinae a little recurved medially; prozona 1.4 times as long as metazona. Mesosternal interspace trapezoidal, minimum width 2.1 times larger than length; metasternal lobes separate. Tegmen abbreviated, 2.3 times as long as wide, touching each other in mid dorsal line, apex rounded, not reaching or just reaching half of hind femur, or surpassing hind margin of the 7 th abdominal tergite; anterior margin sinuate, precostal area ending at 1/3 of whole length; costal area 1.6–1.7 times as wide as subcostal area, medial area weakly wider than or equal to radial area. Hind wing vestigial, not surpassing half of 1 st abdominal tergite. Hind femur 3.7 times longer than wide, inner side with 48–53 conical stridulatory pegs. Hind tibia with 11 spines on both dorsal margins, outer apical spine absent.

Abdomen. Tympanum developed. 10 th abdominal tergite partially excised in middle, furculae faint. Epiproct triangular, as long as wide, shallowly furrowed at basal half, apex rectangular. Cerci long conical, surpassing hind margin of epiproct, apex blunt. Subgenital plate short conical, apex obtuse. Epiphallus with bridge semicircular; lateral plate with outer-lower corner acute angled; lophi nearly nearly oblong in lateral view, distal portion densely interspersed with granules; anchorae stout, pointing ahead and ventrad.

Coloration. Body greyish-green or greyish-brown.Antennae with basal segments brown, others dark. Postocular bands black. Tegmen with anal area yellowish brown, others with basal portion dark and apical portion hyaline but costal area white in basal portion. Hind femur brown or greyish-brown, outer side with two blackish spots in most individuals. Hind tibia greyish-brown.

Female. 5 th nymph, similar to male, but the notch on the posterior margin of pronotum deeper.

Measurements (mm). Length of body: ♁11.5–12.4; length of pronotum: ♁ 2.4–2.5; length of hind femur: ♁ 7.5–7.6.

Type material. Holotype: ♁, China, Sichuan, Xinlong (Tongxiao), 30.85° N, 99.94° E, 24 Aug. 2020, collected by Zhi-Pan Huang. Paratypes. 4♁, 1♀ (5 th nymph), same data, deposited in BMDU .

Diagnosis. This new species is similar to L. muliensis , sp. nov., but differs from the latter in: 1) antennae not surpassing hind margin of pronotum, median segment mean 0.8 times as long as wide, in the latter antennae finely surpassing hind margin of pronotum, median segment mean 1.3 times as long as wide, 2) male tegmen with precostal area ending at 1/3 of whole length against 1/ 2 in the latter, 3) male 10 th abdominal tergite with very faint furculae instead of clear furculae in the latter.

Etymology. The specific epithet refers to the type locality, Xinlong County, Sichuan Province, China.

Distribution. CHINA: Sichuan.

Figures

FIGURES 11–15. External morphological characters of the species Leuconemacris xinlongensis, sp. nov.. 11: male pronotum, dorsal view; 12–13: male terminalia, lateral and dorsal views; 14: male right tegmen; 15: epiphallus, dorsal view. Scale bars = 1 mm.

FIGURES22–31.HabitusofthespeciesintheLeuconemacris,indorsalandlateral views,maleandfemale.22–23:Leuconemacris acuminata, sp. nov.; 24–25: L. daochengensis Zheng, 1988; 26–27: L. muliensis, sp. nov.; 28–29: L. xiangchengensis Zheng, 1988; 30–31(5th nymph): L. xinlongensis, sp. nov..