Barsura vernalis Volynkin, 2017

Volynkin, A. V., 2017, Review of the genus Barsura Volynkin, Dubatolov et Kishida, 2017 (Lepidoptera, Erebidae, Arctiinae) from Vietnam, with description of two new species, Far Eastern Entomologist 339 (339), pp. 1-11 : 7-9

Barsura vernalis Volynkin , sp. n.

Figs 3, 4 , 16 , 22

TYPE MATERIAL. Holotype – ♂, North Vietnam: Mt. Fan-si-pan, N side,

Chapa, 22°15'N, 103°45'E, 2250 m, 26.IV 1995, leg. Sinjaev & loc. coll., slide

MWM 31353 Volynkin (Coll. MWM/ ZSM). Paratypes: same data as in the holotype, 15 ♂, 3 ♀, slides MWM 31368 (♂) and MWM 31367 (♀) Volynkin (Coll.

MWM/ ZSM); Mt. Fan-si-pan (North), 1600 m, Cha-pa, primary forest, 22.17''N,

103.44''E, 20–30.IV 1995, 1 ♂, 1 ♀, leg. V. Sinjaev & nat. coll. (Coll.

MWM/ZSM); Mt. Fan-si-pan, Cha pa, 1700 m, 22.15' N 103.46 'E, VI 1994, 1 ♂, 3

♀, leg. Sinjaev & nat. coll. (Coll. MWM/ ZSM); Mt. Fan-si-pan (West), 1600–1800

m, Cha-pa (=Sapa), sec. forest/agricult., 22.20' N 103.40 'E, 10.VI–6.VII 1994, 1 ♀,

Sinjaev & nat. coll. (Coll. MWM/ZSM); Mt. Fan-si-pan (West), 1600–1800 m,

Cha-pa, secondary forest, 22.20' N 103.40 'E, IV 1995, 11 ♂, 3 ♀, leg. Sinjaev & loc.

coll. (Coll. MWM/ ZSM); Mt. Fan-si-pan (West), 1600–1800 m, Cha-pa, XI 1994,

22.20' N 103.40 'E, secondary forest/agricult., 10.VI–6.VII 1994, 2 ♀, Sinjaev & loc.

coll. (Coll. MWM/ ZSM); North Vietnam, Tam Dao , 60 km NW Hanoi, 950 m, secondary forest, 21.34' N 105.20 'E, IV 1995, 3 ♂, leg. V . Sinjaev (Coll. MWM/ZSM).

DIAGNOSIS. The new species is similar externally to B. clandestina ( Figs 5, 6 )

and can be differed by the genitalia structures only. The male genitalia are surprisingly similar to those of Chinese B. obscura Volynkin, Dubatolov et Kishida,

2017 ( Fig. 17 ) and not B. clandestina ( Fig. 15 ) due reduction of the distal saccular process, but differ by the shorter and broader distal costal process with an arcuate curved ventral margin, the broader aedeagus, the more robust carinal plate, the larger cornuti of the lateral field, and presence of a bunch of two-three needle-ike subapical cornuti directed apically (whereas in B. obscura there is a row of two-three much shorter subapical cornuti directed laterally). The female genitalia of B. vernalis

( Fig. 22 ) are more similar to those of B. clandestina ( Fig. 21 ) and not B. obscura

( Fig. 23 ), and differ by the much broader and deeper concavity of the antevaginal plate, the broader and more sclerotized ductus bursae, and the smaller anterior section of corpus bursae.

DESCRIPTION. Adult ( Figs 3, 4 ). Forewing length 14.5–15.5 mm in males and

16–17 mm in females. Male antennae bipectinate, female antennae ciliate. Head and thorax ochreous-yellow; abdomen paler, ochreous. Forewing ground color intense ochreous-yellow. Forewing pattern consists of subbasal black dot, curved antemedial line consisting of four blackish dots, S-like medial and postmedial lines situated very close to each other and consisting of blackish small spots of different size, and diffuse cuneate wedge connected to shadows with blackish suffusion on veins in the subterminal area. Cilia ochreous-yellow. Hindwing monotonous pale ochreousyellowish, cilia pale ochreous-yellowish.

Male genitalia ( Fig. 16 ). Uncus long, narrow, smoothly curved, apically pointed.

Tuba analis narrow, scaphium narrow, weakly sclerotized; tegumen moderately long and broad, slightly C-like curved; juxta trigonal, with deep lower concavity vinculum short, broad, U-like. Valva elongated, broad; costa heavily sclerotized,

with robust, curved and apically pointed ventral process, and large, robust, trigonal distal process with curved dorsal margin; sacculus broad, with very short trigonal distal process. Aedeagus long and narrow, with short and narrow coecum, and carinal plate with three-four short trigonal thorns. Vesica membranous, globular,

with subbasal ventral diverticulum with bunch of several strong thorn-like cornuti,

conical medial ventral diverticulum, apical and lateral fields consist of broad robust trigonal cornuti of different sizes, and subapical bunch of two-three long needlelike, slightly curved cornuti.

Female genitalia ( Fig. 22 ). Ovipositor short, broad, conical; papillae anales broad,

rectangular with rounded edges; apophyses and posteriores long and thin, apophyses posteriores about two times longer than apophyses anteriores. Antevaginal plate wrinkly sclerotized, with deep and broad round concavity near its conjunction with ostium bursae. Ostium bursae broad; ductus bursae broad, short, narrowed anteriorly,

dorso-ventrally flattened, with strongly sclerotized lateral folds, left fold longer and broader than right fold. Corpus bursae small, subdivided into two asymmetric,

heavily sclerotized lateral lobes covered inside with numerous short spinules, and elliptical, weakly sclerotized anterior section with weak spine-like scobination;

appendix bursae small, conical, membranous, situated dorso-posteriorly.

DISTRIBUTION. North Vietnam (Hoang Lien Son mountain range).

ETYMOLOGY. From Latin “ vernalis ” (spring). The specific epithet refers to its spring flight period.

nam, Fan-si-pan Mts., slide MWM 31497 Volynkin; 21 – B. clandestina , paratype, China ,

Yunnan, slide AV 2021 f Volynkin; 22 – B. vernalis sp. n., paratype, Vietnam, Fan-si-pan Mts.,

slide MWM 31367 Volynkin; 23 – B. obscura, paratype, China, Yunnan, slide AV 2022 f

Volynkin; 24 – B. lineata , Vietnam, Fan-si-pan Mts., slide MWM 31366 Volynkin; 25 –

B. nubifascia, Sikkim , slide BMNH(E) Arct-6502f Volynkin (©NHMUK).

Figures

Figs. 1–8. Adults of Barsura spp. 1, 2 – B. autumnalis sp. n.: 1 – holotype ♂, Vietnam, Fan-si-pan Mts. (MWM/ZSM); 2 – paratype ♀, Vietnam, Fan-si-pan Mts. (MWM/ZSM); 3,

Figs. 14–17. Male genitalia of Barsura spp. 14 – B. autumnalis sp. n., holotype, Vietnam, Fan-si-pan Mts., slide MWM 31495 Volynkin; 15 – B. clandestina, holotype, China, Yunnan,

Figs. 20–25. Female genitalia of Barsura spp. 20 – B. autumnalis sp. n., paratype, Viet-