Barsine biformis Volynkin & Černý, 2019

Volynkin, Anton V., Černý, Karel & Huang, Si-yao, 2019, A review of the Barsine perpallida-B. yuennanensis species-group, with descriptions of six new species (Lepidoptera: Erebidae: Arctiinae), Acta Entomologica Musei Nationalis Pragae 59 (1), pp. 273-293 : 274-279

Barsine biformis Volynkin & Černý , sp. nov.

( Figs 1–4 , 33 , 48 )

Korawa perpallida (misidentification): ČERNÝ & PINRATANA (2009): 77 (species account), pl. 16, figs 151a–151c (adults).

Type locality. Thailand, Changwat Nan, 30 km E of Pua, ca. 19°9′N 101°15′E, 1700 m.

Type material. HOLOTYPE ( Figs 1 , 33 ):♂, “ Thailand / Changwat Nan / 30 km E of Pua, 1700 m, 14–15.IX.1999 / leg. A. Szabó & Z. Czere ”, slide MWM 31351 Volynkin ( MWM / ZSM) . PARATYPES: THAILAND: 6 ♂♂ 4 ♀♀, same locality as in the holotype, but 8.iv.1998, leg. Tibor Csővári & Pál Stéger, slide ZSM Arct. 155/2017 ♀ Volynkin ( MWM / ZSM); 1 ♂, Thailand, Changwat Nan, 30 km E of Pua 1700 m, 6.iv.1996, leg. Tibor Csővári & Pál Stégér ( CKC); 5♂♂ 3♀♀, N Thailand, Chiang Mai, Fang, Doi Ang Khang, 1425 m, 29°54′11′′N, 99°2′32′′E, 19–23.ix.2006, leg.T. Ihle ( CKC); 1 ♂, same locality and collector, but 11–15.ix.2006 ( CKC); 12 ♂♂ 2♀♀, same locality, 25–26.iv.2006, leg. K. Černý,slideAV2787♂ Volynkin ( CKC); 1♂, N Thailand, Mae Hong Son, 10 km E Khun Yuam, 950 m, 18°47′10′′N, 98°3′4′′E, forest edge, 1.v.2006, leg.K.Černý ( CKC). VIETNAM: 4 ♂♂, N Vietnam, 1400 m, Mai-chau, primary forest, 40 km SE Moc-chau, 20.50′N 104.50′E, 07–15.iv.1995, leg. Sinjaev & local collectors, slide MWM 31541 (♂) Volynkin ( MWM / ZSM).

Diagnosis. The species has two forms, patterned ( Figs 1, 2 ) and patternless ( Figs 3, 4 ), occurring sympatrically. Externally, the patternless specimens of B. biformis are similar to B. perpallida ( Figs 5–7 ), but differ in their smaller size, slightly darker forewings and principally different male and female genitalia structures. The broadened distal saccular process of B. biformis ( Fig. 33 ) resembles those of B. delicia Swinhoe, 1891 (illustrated by VOLYNKIN & ČERNÝ 2016) and B. sieglindae Černý, 2016 (illustrated by ČERNÝ 2016), but B. biformis is well separated from them by its narrower juxta, the presence of a large, stick-like dentate subbasal process of valva costa, its smaller medial costal process, larger distal costal process, shorter basal saccular process, much stronger broadened distal saccular process with a longer and apically pointed dorsal lobe, and different configuration of diverticula of vesica. In the female genitalia, B. biformis ( Fig. 48 ) differs from B. delicia (illustrated by VOLYNKIN & ČERNÝ 2016) in its longer and narrower ductus bursae, stronger scobination of corpus bursae, the presence of the second signum, and shorter, conical and weaker sclerotized appendix bursae (in B. delicia , it is longer, heavily sclerotized and hook-like curved).

Description. Adult ( Figs 1–4 ). Forewing length 14.0–15.0 mm in males (14.5 mm in holotype) and 18.5–19.0 mm in females. Male antennae ciliate, female antennae filiform. Body and forewing ochreous yellow. In patterned form, pattern dark grey, diffuse. Antemedial and medial lines consist of broad spots, often fused with each other. Postmedial line consists of wide longitudinal strokes of various length (those strokes interrupted in females). Hindwing pale yellow. Male genitalia ( Fig. 33 ). Uncus narrow, its distal third curved, apically pointed; tuba analis membranous, subscaphium broad and setose; tegumen short and narrow; juxta weakly sclerotized, X-shaped; vinculum short, V-shaped. Valva broadened medially; basal part of costa broadened, with heavily sclerotized, long, stick-like dentate process directed distally. Medial costal process short, trigonal, with pointed apex; distal costal process well developed, trapezoidal. Distal membranous lobe of valva elongated, rounded apically, directed distally. Sacculus narrow, its basal process long, narrow, apically pointed, its distal half strongly curved dorsad. Distal saccular process strongly broadened, bilobate, its dorsal lobe directed dorsally, thorn-shaped; its distal process short, its apex blunt. Aedeagus straight, slightly narrowed medially. Vesica with membranous, elongated basal diverticulum and several medial diverticula. 1 st medial diverticulum bilobate, granulated, its larger lobe directed anteriorly; 2 nd medial diverticulum short, globular, with cluster of short thornlike cornuti; 3 rd medial diverticulum elongated, its distal half narrowed and apically rounded, granulated; 4 th medial diverticulum absent; 5 th medial diverticulum large, globular, with cluster of small but robust cornuti of various size. Basal plate of vesica ejaculatorius short, broad, trapezoidal. Female genitalia ( Fig. 48 ). Papillae anales broad, trapezoidal with rounded corners, setose; apophyses long and thin, apophyses anteriores slightly shorter than apophyses posteriores. Ostium bursae broad. Ductus bursae elongated, dorso-ventrally flattened, sclerotized, its anterior half broadened, posterior half with several strong longitudinal subostial folds. Corpus bursae broad, sack-like, its medial and posterior sections dorsally with round sclerotized area surrounded by area of robust, shortly spinulose scobination. Large elliptical signum on ventral surface medially.Anterior section of corpus bursae membranous with smaller elliptical signum anteriorly.

Etymology. The species’ name refers to the presence of two pattern forms within it. Adjective.

Distribution. The new species is known from North Thailand (Chiang Mai and Nan Provinces) ( ČERNÝ & PINRATANA 2009, as Korawa perpallida ) and North Vietnam (Hòa Bình Province).

Figures

Figs 1–8. Barsine spp., adults. 1–4 – B. biformis sp. nov.: 1 – holotype ♂, Thailand (MWM/ZSM); 2 – paratype ♀, Thailand (MWM/ZSM); 3 – paratype ♂, Thailand (CKC); 4 – paratype ♂, Thailand (CKC). 5–8 – B. perpallida (Hampson, 1900): 5 – syntype ♂, India (©NHMUK); 6 – syntype ♀ of Diacrisia porthesioides Rothschild, 1910, India (©NHMUK); 7 – ♂, Nepal (ZSM); 8 – syntype ♀, India (©NHMUK).

Figs 33–35. Barsine spp., male genitalia. 33 – B. biformis sp. nov., holotype, Thailand, slide MWM 31351 Volynkin. 34–35 – B. perpallida (Hampson, 1900): 34 – Nepal, slide ZSM Arct. 230/2017 Volynkin; 35 – China, Xizang, prep. Huang.

Figs 48–53. Barsine spp., female genitalia. 48 – B. biformis sp. nov., paratype, Thailand, slide ZSM Arct. 155 / 2017 Volynkin. 49 – B. perpallida (Hampson, 1900), syntype of Diacrisia porthesioides Rothschild, 1910, India, slide NHMUK010315755 Volynkin (©NHMUK). 50 – B. laszloi sp. nov., paratype, Nepal, slide MWM 35760 Volynkin. 51 – B. hausmanni sp. nov., paratype, Thailand, slide MWM 31547 Volynkin. 52 – B. andromeda sp. nov., paratype, China, Shaanxi, slide MWM 31543 Volynkin. 53 – B. yuennanensis (Daniel, 1952), paratype, China, Yunnan, slide AV1843 Volynkin.