Pseudoechthistatus obliquefasciatus Pic, 1917

Bi, Wen-Xuan & Lin, Mei-Ying, 2016, A revision of the genus Pseudoechthistatus Pic (Coleoptera, Cerambycidae, Lamiinae, Lamiini), ZooKeys 604, pp. 49-85 : 54-55

Taxon classification Animalia Coleoptera Cerambycidae

Pseudoechthistatus obliquefasciatus Pic, 1917 Figures 1, 2, 17, 21, 29, 30, 38, 41, 49, 56, 57-58, Map 1

Pseudoechthistatus obliquefasciatus Pic, 1917: 7. Type locality: Tali, Yunnan, China. Type depository: MNHN.

Pseudechthistatus (sic) obliquefasciatus : Breuning 1942: 133; Hua 2002: 227; Hua et al. 2009: 466; Löbl and Smetana 2010: 286.

Pseudoechthistatus obliquefasciatus : Gressitt 1951: 349; Chiang et al. 1987: 694; Li 1988: 46; Pu 1992: 601; Li 2009: 159.

Type material examined.

Holotype (Fig. 17), female, "Tali / Hte yunnan", " Pseudoechthistatus Pic / obliquefasciatus Pic ", "?? / ?? / (cc? Breuning)", "vari? echthistatus / Pascoe / ??? / p. 359", "gene echthistatus / n. sp.? / (? in coll Boppe)", " Museum Paris / Coll. M. Pic", “type”, “type”, “TYPE” [red label] examined through five photographs taken by N. Ohbayashi in MNHN, 2014, the hand-written labels are mostly illegible.

Additional material examined

(6 males, 12 females): 1 female, Yunnan Weixi Pantiange, 2900 m, 1981.VII.21, leg. Shu-Yong Wang (IZAS, IOZ(E) 1904795); 1 female, Yunnan Weixi Pantiange, 2920 m, 1981.VII.22, leg. Xue-Zhong Zhang (IZAS, IOZ(E) 1904796); 1 female, CHINA, Yunnan, Weixi, Pantiange, Zhazi; N27.34904°, E99.28188° - N27.34647°, E99.27661°, 2917-3029 m, 2009.VII.10, Shi H.L. coll., beating (IZAS, IOZ(E) 1905218); 3 females, Yunnan, Diqing, Weixi, Najieluo, 2921 m, 2014.VI.29, leg. Xiao-Dong Yang (CCCC); 2 males, 1 female, ditto but 2872 m, 2014.VII.1 (CCCC); 1 male, ditto but 3106 m (CCCC); 1 female, Yunnan, Lijiang, Yulong, Ludian, 3219m, 2014.VII.3, leg. Xiao-Dong Yang (CCCC); 2 males, 3 females, Yunnan, Pass 50 km W Judian, 2005.VI.11-13, leg. Ivo Jeniš (CCH); 1 male, 1 female, Yunnan, Yanmen, 2005.VI.13-23, leg. E. Kučera (CCH).

Redescription.

Male (Fig. 1). Body length 18.0-22.2 mm, humeral width 5.5-6.2 mm. Body dark brown; head, pronotum and ventral surface covered with intermixed light yellowish and tawny pubescence. Head with four short tawny vittae behind upper eye lobes. Antennal scape, pedicel and 3rd antennomere with sparse pale pubescence, 4th to 9th antennomeres with same color of pubescence at basal half. Pronotum with two longitudinal tawny bands on each side of disk and other two longitudinal bands on lateral margins postmedially, the discal bands distinctly longer than half of pronotal length. Scutellum densely clothed with tawny pubescence, sparse along middle. Elytron with pubescence predominantly brown, with tawny pubescence forming the subbasal annular marking and few small spots scattered at basal one fifth, with light yellowish pubescence forming the middle band and the preapical stripe; the middle band moderately broad, strongly oblique (inclined at an angle of 40 to 50 degrees to the transverse axis), complete or interrupted or dispersed into small spots, hardly reaching suture; the preapical stripe narrow, well developed, subequal to or slightly shorter than one-fourth of elytral length. Legs (Fig. 30) clothed with yellowish and tawny pubescence of which the tawny one forming small spots moderately scattered on femora and becoming denser on tibiae.

Body elongate, oblong oval. Head (Fig. 21) with frons moderately punctured; lower eye lobe subequal in length and width, 0.7 times as long as gena. Antennae 1.9 times as long as body length, surpassing elytral apex by six antennomeres; 3rd antennomere ca. 1.8 times as long as scape, ca. 1.2 times as long as 4th antennomere; scape and 3rd antennomere coarsely punctured; scape to 3rd or 4th antennomere sparsely fringed beneath. Elytra ca. 1.4 times as wide as pronotal base, 2.0-2.1 times as long as humeral width; humeri slightly constricted, widened at basal two-fifth, then convergent toward rounded apices; disk moderately punctured, slightly denser near suture, becoming shallower at apical one-third, moderately granulated on basal half, becoming weaker anteriorly; subbasal tubercle moderate in size, as wide as or slightly narrower than scutellar width. Hindwings (Fig. 41) strongly reduced, 0.7 times as long as elytral length. Legs long and slender, metatibiae exceeding elytral apices at base.

Male genitalia (Figs 49, 58). Tergite VIII (Fig. 49a) transverse, slightly emarginated apically and nearly straight at sides, length 0.9 times as long as width. Tegmen (Fig. 49 b–c) with lateral lobe widest at base, gently narrowed at basal one-third, then slightly dilated toward rounded apex. Median lobe (Fig. 49 d–e) with apex subacute in antero-dorsal view. Endophallus (n = 3, Fig. 58) subequal to triple length of median lobe, the length of MT ca. 2.4 times as long as the length of BPH, the length of CT+PB slightly longer than the length of BPH; MPH strongly curved at apical one-third, PB cylindrical at basal one-third, basal swelling (bs) of CT moderately developed; APH moderately constrictive, ca. 0.6 times as wide as the maximum width of PB at base, with apical bulb (ab) heavily sclerotized apically in ventral side (Fig. 58c), obliquely truncated in lateral view; small spicules sparsely distributed on apical bulb and anterior margin of PB.

Female (Fig. 2). Body length 16.0-22.1 mm, humeral width 4.6-6.4 mm. Almost identical to male in general appearance. Antennae ca. 1.2 times as long as body length, apical three antennomeres surpassing elytral apex; scape to 5th or 6th antennomere fringed beneath; pronotum subequal in length and basal width; elytron longer in proportion to body length (elytra 2.2-2.3 times as long as humeral width); legs comparatively short, metatibiae exceeding elytral apices at basal half. Female genitalia as Fig. 56.

Diagnosis.

Elytron with predominant brown pubescence, middle band strongly oblique, subbasal tubercle as wide as or slightly narrower than scutellar width; elytral apices rounded; humeri slightly constricted; hindwings strongly reduced. Endophallus with APH constrictive, apical bulb (ab) heavily sclerotized apically in ventral side, obliquely truncated in lateral view.

Distribution

(Map 1). China: Yunnan.

Remarks.

Slightly intraspecific variation can be observed between the population from northern area (Weixi County: Najieluo; Deqin County: Yanmen) and southern area (Weixi County: Pantiange; Yulong County: Ludian, Judian), the northern popu lation with elytra relatively long: elytral length / humeral width ca. 2.1 in male and 2.3 in female, while in southern population, elytral length / humeral width ca 2.0 in male and 2.2 in female. And the holotype is identical to the population from southern area. Currently, sympatry has not been confirmed among the flightless species of this genus, with the exception that the holotype from “Tali” seemingly overlaps with the range of another flightless species, Pseudoechthistatus sinicus . However, the old name “Tali” or "Tali Fu" (Breuning, 1942), which had been abandoned in 1913 covered a vast region including today’s Dali City, Yunlong County, Eryuan County, Binchuan County, Xiangyun County etc. ( Dai et al. 2005: 164). The exact type locality of this species is difficult to determine unless further information is acquired. However, based on the similarity of external characters, we conclude that the type specimen might have been collected from the north of Eryuan county or further north (Map 1a).