Ischnostrangalis ohbayashii Tichý et Lin, 2021

Tichý, T. & Lin, M. - Y., 2021, Description of two new species of Cerambycidae (Coleoptera) from Northwestern Yunnan (China), Far Eastern Entomologist 424, pp. 1-13 : 3-6

Ischnostrangalis ohbayashii Tichý et Lin , sp. n.

http://zoobank.org/NomenclaturalActs/ 5CD5B71D-03E0-46E8-ACCD-728990ECA429

Figs 1–10

TYPE MATERIAL. Holotype: ♂, China: Yunnan, Deqin, Kawagebo, Yubeng pass, 2900–3400 m, 30.VII–2.VIII 2019 ( IZCAS, IOZ (E)2224547) . Paratypes (75 ♂,

20 ♀, deposited in CAS, CNO, CTT, IZCAS ): 7 ♂, 1♀, China: Yunnan, Deqin ,

Kawagebo, Xidang–Yubeng pass, 3500–3800 m, 7–8.VII 2015; 14 ♂, 2 ♀, China :

Yunnan, Deqin, Kawagebo, Yubeng , 3300–3500 m, 13–16.VII 2018 ; 19 ♂, 2♀,

China: Yunnan, Deqin, Kawagebo, Yubeng , 2900–3400 m, 4–6.VII 2019 ; 35 ♂,

14 ♀, China: Yunnan, Deqin, Kawagebo, Yubeng , 2900–3400 m, 30.VII–2.VIII

2019; 1♀, China: Yunnan, Fugong, Lishadi , 2.8 km W of Shibali on Shibali Road ,

2750 m, 27.17405˚ N, 98.76722˚ E, 10.VIII 2005.

paratype; 5–10 – genitalia; 5, 6 – tergite VIII and ventrites VIII, IX; 7, 8, 9 – tegmen and median lobe; 11 – spermatheca. Scale bar for figs. 1–4 = 2 mm, and for figs. 5–11 = 1 mm.

DESCRIPTION. MALE ( Figs. 1–2 ). Length from the tip of mandibles to the apex of elytra 12–15 mm, humeral width about 2.8 mm. Body black, with dull appearance because of dense golden pubescence, especially on head, pronotum and underside.

Antennal segments colored as follows: 1st–3rd black, 4–8th black with light apical part, 9–11th light; the tip of the ultimate segment sometimes black. Elytra brownishyellow except black apices and lateral stripe covering up to apical 2/3 of elytral length, usually interrupted in the middle of elytra; the stripe reaches the margin in apical third, otherwise well separated from the margin so that an isolated black spot is usually created just before the middle of elytra; however, this spot is sometimes missing. Opposed to all other species of I. semenowi group, the new species is spotless at humeri, even at sides. Whole abdomen mostly brownish-red in both sexes, though the tip partly blackish in males.

Head about as long as pronotum, slightly narrower across the eyes than pronotum at base; strongly narrowed behind the eyes, i.e., temples undeveloped, oblique; neck long; densely covered with long golden pubescence. Antennae relatively short, about the same length as body or slightly shorter; all segments of similar length, except 2nd

segment, which is very short; 5th segment the longest. Scapus moderately thickened.

Pronotum 1.2 times as long as wide basally, relation of basal to apical width 1.5;

strongly constricted at apical fourth, then inflated posteriorly and well-rounded in the middle, with less strong constriction before the base, densely covered by long golden pubescence; apical margin distinct. Longitudinal depression located in the center of the disc, rather indistinct.

Scutellum triangular, apically prolonged, densely covered by golden pubescence.

Elytra 3.4 times as long as humeral width; regularly narrowing to apices; each apex obliquely emarginate with sharply pointed outer angle and spinous inner angle;

with relatively dense punctures; covered with relatively dense (not so dense when compared to head and pronotum) semi-erect pubescence of golden color.

Legs of normal size of the genus in relation to the body, long and slender, relative lengths of 1st to 3rd tarsal segments are as follows: fore tarsus = 1.7: 1.25: 1; middle tarsus = 2.5: 1.5: 1; hind tarsus = 4: 1.8: 1.

Male genitalia as in Figs. 5–10 . Median lobe arcuate in lateral view ( Fig. 8 );

ventral plate apparently narrowed in the apex ( Fig. 7 ); median struts long and relatively broad, rounded in outer apices ( Fig. 9 ). Tegmen shorter than median lobe;

parameres relatively long (ca. 2/7 of tegmen length) and narrow (compare with I.

manipurensis group in Ohbayashi & Lin, 2013), length ca. 5.5 times of width,

apically rounded and well separated, with several long setae at outer apices, setae much shorter than parameres; ringed part with subparallel sides (without obvious elbowed part), constricted behind the middle, slightly wider again, then converging at apex. Tergite VIII ( Figs. 5–6 ) constricted in about 2/3 of its length, broadly rounded in apices, densely clothed with medium erect setae and well differs from I.

manipurensis group as stated in Ohbayashi & Lin (2013).

FEMALE ( Figs. 3–4 ). Length from the tip of mandibles to the apex of elytra

12–17 mm, humeral width about 3 mm. Elytra much wider than in male, 3.1 times as long as broad at humeri. Antennae shorter.

DIFFERENTIAL DIAGNOSIS. The new species can be easily distinguished from all other species of I. semenowi group by strongly reduced black lateral stripe of elytra (i.e., basal third is completely yellowish even at sides) and the color of antennal segments (1st–3rd black, 4–8th black with light apical third, 9–11th light,

except the apex of 11th). Over the years, when visiting the type locality, also several specimens of local population of I. rhododendri were collected together with the new species at flowering Viburnum sp. It can be easily distinguished from the new species by smaller and narrower body, less rounded pronotum, longer antennae,

reddish femora (and tibiae), unicolor black antennal 1–8 segments, and not so dense golden pubescence of head and pronotum.

BIONOMY. The highest activity of the new species is relatively late in summer

(second half of July), similarly to other species of I. semenowi group. It mostly visits

Sambucus adnata Wallich ex Candolle because of its long flowering period, though earlier in the season it can be found on other shrubs as well (e.g., Viburnum sp. ).

DISTRIBUTION. China (Yunnan).

ETYMOLOGY. Named in honor of Mr. Nobuo Ohbayashi who did significant contribution to the knowledge of this genus.

Figures

Figs. 1–11. Ischnostrangalis ohbayashii sp. n.: 1, 2 – male holotype; 3, 4 – female