Leuconemacris muliensis, 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 : 269-271

Leuconemacris muliensis , sp. nov. ( Figs 6–10 , 26–27 )

Description. Male. Small size.

Head. Head 1.1 times longer than 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 1.8 times as wide as frontal costa between antennae; frontal costa broad and shallowly concave at whole length, lateral margins nearly parallel but gradually expanded below median ocellus. Antennae thick, 20 segments, slight surpassing hind margin of pronotum, basal segments weakly compassed, median segment (9 th –13 th) mean 1.3 times as long as wide. Eyes roundly triangular, longitudinal diameter 1.2–1.3 times horizontal diameter and 0.9–1.0 times the length of subocular furrow.

Thorax. Pronotum with anteral margin straight, posterior margin with a small median notch; median and lateral carinae distinct, lateral carinae a little recurved medially; prozona 1.4–1.6 times as long as metazona. Mesosternal interspace trapezoidal, minimum width 1.9 times larger than length; metasternal lobes separate. Tegmen abbreviated, 2.2 times as long as wide, dorsally touching each other, apex rounded, reaching 1/3–2/5 of hind femur, or reaching hind margin of 5 th abdominal tergite; anterior margin sinuate, precostal area ending at half of whole length; costal area 1.6–2.0 times as wide as subcostal area, medial area wider than or equal to radial area. Hind wing vestigial, not surpassing half of 1 st abdominal tergite. Hind femur 4.0–4.3 times longer than wide, inner side with 58 conical stridulatory pegs. Hind tibia with 11 spines on both dorsal margins, outer apical spine absent.

Abdomen. Tympanum developed. 10 th abdominal tergite excised in middle, with furculae. Epiproct pentagonal, 1.0–1.1 times as long as wide, shallowly furrowed at basal half, apex rounded. Cerci long conical, finely surpassing apex of epiproct, apex blunt. Subgenital plate strangely tapered, long conical, apex bluntly acute. Epiphallus with bridge semicircular; lateral plate with outer-lower corner ectad protruding; lophi with distal and basal portions densely interspersed with granules; anchorae stout, pointing ahead and ventrad.

Coloration. Body greyish-green or greenish-brown. Antennae with basal segments brown, others dark. Eye brown. Tegmen with basal portion brown and apical portion hyaline but costal area white in basal portion. Hind femur with outer side brown, lower side yellow. Hind tibia yellowish-red.

Female. Similar to male, but body stout, eyes longitudinal diameter 1.2 times horizontal diameter and 0.8 times the length of subocular furrow, the notch on the posterior margin of pronotum clearer, tegmen surpassing hind margin of 1 st abdominal tergite. Subgenital plate oblong, acutely protruding in the middle. Upper ovipositor valves with upper-outer margin rough, lower ovipositor valve nearly straight, edge rough.

Measurements (mm). Length of body: ♁12.0–13.0, ♀ 18.5–20.0; length of pronotum: ♁2.4–2.5, ♀ 3.3–3.5; length of hind femur: ♁7.9–8.0, ♀ 8.7–9.0.

Type material. Holotype: ♁, China, Sichuan, Muli (Bowo), 28.97° N, 101.11° E, alt. 4028 m, 18 July 2021, collected by Rong-Long Yang and Zhi-Pan Huang. Paratypes. 20♁, 20♀, same data, deposited in BMDU .

Diagnosis. This species is closely related to L. xiangchengensis , in general features, especially in the length of male tegmen, in the length of precostal area being 1/2 of whole length, in the same ratio of costal area comparing subcostal area in width, and the undulate upper-outer margin of upper ovipositor valves. But it differs from the latter in: 1) head 1.1 times as long as pronotum (length of head less than that of pronotum in the latter); 2) longitudinal diameter of eye larger than transverse diameter 1.2–1.3 times (the longitudinal diameter a little larger than or equal to transverse diameter in the latter); 3) antennae with median segment (9 th –13 th) mean 1.3 times as long as wide (the width of median segment larger than the length in the latter); 4) male tegmen with anterior margin sinuate (the margin nearly straight in the latter).

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

Distribution. CHINA: Sichuan.

Figures

FIGURES 6–10. External morphological characters of the species Leuconemacris muliensis, sp. nov.. 6: male pronotum, dorsal view; 7–8: male terminalia, lateral and dorsal views; 9: male right tegmen; 10: 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..