Eustrangalis (Eustrangalis) fuscisuturalis, Wang & Xie & Wang, 2024

Wang, Yingqi, Xie, Guanglin & Wang, Wenkai, 2024, New data on the genus Eustrangalis Bates from China (Coleoptera: Cerambycidae, Lepturinae), Zootaxa 5453 (4), pp. 558-566 : 561-566

Eustrangalis (Eustrangalis) fuscisuturalis sp. nov. ḃDz真AEħ牛

( Figs 2a, b , 3a , 4 , 5a, c )

Description. Male. Body length 14.0–16.0 mm, humeral width 3.0– 3.5 mm. Body mostly yellowish-brown, with blackish-brown to black stripes and recumbent short yellowish-brown setae. Head mostly dull yellowish-brown, clothed with some yellowish-brown hairs on vertex; apex of labrum and half apex of mandibles blackish-brown; occiput with a broad black stripe that extends narrowly forwards along the margins of each upper eye lobe to the vertex, sometimes not extending forwards ( Fig. 4c, d ); vertex and occiput sometimes mostly blackish-brown ( Fig. 4e, f ). Antennae yellowish-brown, slightly lighter towards apex. Pronotum mostly yellowish-brown, clothed with a recumbent yellowish-brown seta in each punctation and provided with a conspicuous longitudinal black stripe on each side, the black stripe sometimes occupying the most of pronotum ( Fig. 4e, f ). Elytra slightly lighter in colour than head and pronotum; each elytron with a distinct blackish-brown longitudinal stripe from humeri extending backwards to apex, sometimes the strip gradually light chestnut in colour from behind the shoulder backwards to the apex ( Fig. 4a–f ); the suture entirely blackish-brown to chestnut, epipleuron behind basal fourth blackish-brown to chestnut; each punctation bears a recumbent short yellowish-brown seta. Abdominal ventral surface darker than that of head and thorax. Setae on ventral surface of meso- and metathorax denser and longer than those on abdominal ventral surface.

Head densely punctate, more sparsely and coarsely on clypeus, with a smooth, impunctate, subsemicircular region on the middle of the apical frons. Antennae slightly exceeding elytral apices; scape distinctly curved and thickened towards apex in lateral view, slightly shorter than antennomere III; antennomere V longest; relative lengths from antennomeres I to XI as follows: 27: 5: 28: 25: 34: 30: 29: 26: 25: 24: 26.

Pronotum densely punctate, slightly longer than basal width, deeply constricted at apical fifth and moderately so at basal fourth; disc convex above and roundly prominent laterally, with a smooth, glabrous, narrow central region; base distinctly bisinuate. Elytra about 3.1 times as long as humeral width, straightly convergent from humeri towards apex; disc longitudinally depressed along suture, with deep punctures which are coarser and sparser than those of head and pronotum, and becoming shallower towards apex; apex obliquely emarginate, with sharply toothed outer angle and pointed inner angle.

Metaventrite thick, strongly convex beneath, finely punctate and provided with a pair of longitudinally ridged small projections beside median line at posterior half. Abdomen sparsely and finely punctate; apical region of fifth ventrite triangularly depressed on centre, with slightly emarginate apical margin. Legs short and slender; metatibia inwardly thickened from about apical two-fifths; metatarsus with first tarsomere about 1.7 times as long as the next two combined.

Male genitalia. Tergite VIII ( Fig. 5a ) with both sides subparallel at basal half, then gradually curving towards apex; apex broadly rounded, clothed with short to medium straight setae on apical half except for a central glabrous triangular region. Tegmen yellowish brown, slightly bent in lateral view. Parameres ( Fig. 5c ) relatively short, moderately separated each other and slightly curved inward near apices; each one length 2.1 times as long as width, lateral edge partly dark brown, apex blunt rounded with several long setae.

Female. Unknown.

Material examined. Holotype (male), China: Hubei province, Yichang (đš), Dalaoling National Nature Reserve (kŧ岭), Zhucaogou (Bdz沟), alt. 1560 m, 1 May 2014, coll. Guanglin Xie. Paratypes: two males, same data as for the holotype ; two males, China: Hubei province, Shengnongjia National Forest Park (ėƛ架), Yousongping (油松坪), 16 June 2022, coll. Weiwei Zhao ; one male, China: Shaanxi province, Yangxian (洋县), Huayang town (华DDz), Hongshiyao (Ḧ石±), 33°38′24″N, 107°29′24″E, alt. 1270 m, 12 May 2018, coll. Lanbin Xiang ; one male, China: Shaanxi province, Meixian (眉县), Yingtou town (üíDz), Honghegu National Forest Park (Ḧ河ĕ), 34°5′11″N, 107°45′23″E, alt. 1100 m, 5 May 2019, coll. Heng Xin. The holotype and paratypes are deposited in the Insect Collection, College of Agriculture , Yangtze University (YZU).

Distribution. China: Hubei, Shaanxi.

Etymology. The species name is a combination of the Latin word ‘fuscus’ and ‘sutura’, referring to the fuscous suture of the elytra.

Comments. The new species is similar to E. latericollis and E. distenioides . It differs from the former by the elytra with the distinct blackis-brown to chestnut longitudinal stripes from the humeri to apices, the suture and epipleuron blackish-brown to chestnut, the tergite VIII with more broadly rounded apex, parameres shorter (length/ width ratio about 2.1), while in E. latericollis , the elytra are black only on humeri, the suture is blackish-brown to black only a short distance after scutellum, the length/width ratio of the paramere is about 3.2. It is different from the latter by the antennae yellowish-brown, the pronotum with the black stripe extending to the base and apex and the abdomen entirely dull yellowish-brown.

The new species was captured on the flowers of Litsea ichangensis Gamble and Cornus alba Linnaeus , two of the currently known plants whose flowers are visited.

Figures

FIGURE 2. Male habitus of Eustrangalis spp. a, b. Eustrangalis (Eustrangalis) fuscisuturalis sp. nov.; c, d. Eustrangalis (Eustrangalis) latericollis Wang & Chiang, 1994; e, f. Eustrangalis (Eustrangalis) distenioides Bates, 1884; a, b. holotype; e, f. syntype, NHMUK; scale: 5 mm.

FIGURE 3. Habitus of Eustrangalis spp. a. Eustrangalis (Eustrangalis) fuscisuturalis sp. nov.; b, d–g. Eustrangalis (Eustrangalis) latericollis Wang & Chiang, 1994; c. Eustrangalis (Eustrangalis) distenioides Bates, 1884; a–c. male; d, f, g. female; a, d, f. holotype; c. syntype; e. holotype labels; scale: 5 mm.

FIGURE 4. Male paratypes of Eustrangalis(Eustrangalis) fuscisuturalis sp. nov.; a–d. from Shengnongjia; e–f. from Dalaoling; scale: 5 mm.

FIGURE 5. Habitus of Eustrangalis spp. a, c, e. Eustrangalis (Eustrangalis) fuscisuturalis sp. nov.; b, d. Eustrangalis (Eustrangalis) latericollis Wang & Chiang, 1994; a, b. Tergite VIII; c, d. Parameres; e. living male adult on the flowers of Litsea ichangensis Gamble; scale: 1 mm.