Seiarctia lewisii Butler, 1885, by original designation.

Species of this genus typically have a medium wingspan, long bipectinate antennae, a red patagium, a narrow red abdomen, yellow tegulae, white or yellow longitudinal fascia transversing brown forewings, pale white or yellow-white hindwings with various sized brown spots in terminal and discal areas.

Male genitalia. Uncus massive, wide base abruptly narrowing at the tip; tegumen medium size; gnathos reduced; valvae simple with even edges but concave, rough or rounded at the apex; juxta wide with wide excision; saccus short, semioval form; aedeagus straight, longer than valvae; vesica multiplex.

Female genitalia. Papilla analis massive; apophysis posterioris approximately 2.5 times shorter than apophysis anterioris; ductus short; bursa bisaccate, rounded, without signum.

Fourteen species of Eospilarctia are distributed in China, Myanmar, Vietnam, Taiwan and Japan.

Holotype: male (Plate 1: fig. 3), northern Vietnam, Mt. Fan-si-pan, 1600-1800 m near Chapa 22°20"N, 103°40"E. Secondary forest, May 1995, leg. local collectors ex coll. A. Schintlmeister (slide No.OP1227), (deposited in ZSM/MWM).

Paratype: male, northern Vietnam, Mt. Fan-si-pan, Chapa, 1700 m NN (22°15"N, 103°46"E), June 1994, leg. Sinjaev & Einheim. Sammler (slide No.OP1226), (deposited in ZSM/MWM).

The new subspeciesis larger than other Eospilarctia species and nominate Eospilarctia yuennanica yuennanica (Plates 3, 4). The pale yellow fascia of the forewings are much wider than in the nominate subspecies. Costal fascia of Eospilarctia yuennanica fansipana ssp. n. extend to the middle of discal cell and the basal fascia ends in a sharp diagonal tip. Eospilarctia yuennanica yuennanica is smaller (cotype forewing 28 mm, wingspan 59mm), forewing markings are similar except that the fascia are much narrower. In the male genitalia the valvae widen without a dorsal excision at apex; juxta with big lateral protrusions, subbasal diverticulum of the vesica has a simple mammilla form; median diverticulum is gently curved, wide.

Male: Forewing length of holotype and paratype 33 mm, wingspan 66 mm. Wing pattern typical of genus; forewings’ pale yellow fascia very wide; costal fascia reaching middle of medium cell; basal fascia with sharp diagonal tip.

Male genitalia (Plate 2: figs 4–6): valvae of the same type as the nominate subspecies, but dorsal margin near apex with big excision; oval juxta with wide excision at top, lateral arms very short; aedeagus longer than valvae, gently curved; vesica with footshaped subbasal diverticulum; median diverticulum long, narrow, strongly curved with short spines.

Female genitalia: unknown.

Known only from the Fan-si-pan mountains in far northern Vietnam. Two male specimens were attracted to light at the end of May at elevations ranging from 1600 to 1800 m.

The specific name refers to the type-locality of the new subspecies.

♂ (Plate 1: fig. 4, Plate 6: fig. 4), China, Yunnan prov. Dali Bai autonomy pref., Yulong county, Fengshuiuiny Mts., 2460 m., 13 km. N. of Coajian, 10–20 May 1999, 25°46"N, 99°06"E, leg./ex.coll. Dr R. Brechlin (slide No.OP1225m), (deposited in ZSM/MWM).

Externallythe new speciesis most similar to the sibling species Eospilarctia guangdonga Dubatolov, Kishida & Wang, 2008 status n., Eospilarctia yuennanica yuennanica (Daniel, 1943) and Eospilarctia naumanni sp. n. In Eospilarctia guangdonga (species was recently described and well illustrated (Dubatolov et al 2008)) the wing markings are noticeably paler and in the male genitalia the valvae do not widen at the excavated apex. The forewings of Eospilarctia yuennanica yuennanica have more intensive brown markings, with fascia pale white, and the male valvae widen to rough-edged apex. In Eospilarctia naumanni, the costal fascia from the forewing base do not extend to apex of medial cell. In the male genitalia the valvae are almost the same width as length, slightly curved at the middle and wide at tip; saccus massive, slightly narrowing with a blunt tip; juxta “X” shaped, top and bottom deep, juxta lateral sides with weak excavations; aedeagus straight, longer than valva, with visible bulge at ventral tip.

Male: Forewing length of holotype 26 mm, wingspan 50 mm; antennae strongly bipectinate; ground color of forewings dark blackish brown, veins yellow, wing pattern typical of genus. Costal fascia from base not extending to M cell apex. Terminal streak from M2 straight, direct to termen at 45 degree angle crossing vein M1, narrow, with even edges. Hindwings whitish yellow, with brown patches, ventral pattern and color of wings similar to dorsal.

Male genitalia (Plate 2: figs 7–9, Plate 6: figs 1–3): Uncus severely narrowing to blunt tip; valvae almost the same width as length, slightly curved medially to the wide, oval apex; tegumen wide, narrowing; saccus massive, slightly narrowing to blunt tip; juxta wide at top and bottom deep, sides slightly excavated; aedeagus straight, longer than valvae, with ventral bulge at tip; vesica with two subbasal diverticula.

Female : unknown.

Known only from the Fengshuiuiny Shan Mountains in Yunnan province in southwest China, Eospilarctia maciai sp.n. is likely endemic to Yunnan, and the nearby regions of Myanmar. The single male specimen was attracted to light in mid-May at an elevation of 2500 m.

The new species is named after Mr Ramon Macià Vilà (Barcelona, Spain), the famous Iberian Peninsula’s Arctiidae specialist.

Holotype: ♂ (Plate 1: fig. 5, Plate 7: fig. 4), Northeast Myanmar (Burma), Kachin state, road Chibwe - Pang Wah, 2 km N branch to Kanphant, 2180 m, 25.4251°N, 98.5431°E, 23 May, 2006 at light, leg. Stefan Naumann, Michael Langer, & Swen Löffler, ex. coll. Swen Löffler (slide No.OP1228) (deposited in ZSM/MWM).

Paratype: ♀ (Plate 1: fig. 6, Plate 8: fig. 1), Northeast Myanmar, road Kanphant – Mt. Inwa Bum, forest camp, 2440 m, 26.1608°N, 98.35149°E, 25 May, 2006, leg. S. Naumann, M. Langer, & S. Löffler, ex. coll. Swen Löffler (slide No.OP1229f), (pers. comm. S. Naumann) (deposited in ZSM/MWM).

Externallythe new speciesis most similar to sibling species Eospilarctia guangdonga Dubatolov, Kishida & Wang, 2008, Eospilarctia yuennanica (Daniel, 1943) andEospilarctia maciai sp. n. In Eospilarctia guangdonga thewing markings are noticeably paler and in its male genitalia the valvae are not widening at the apex, here with a noticeable excavation. Eospilarctia yuennanica forewings are intense brown with pale white markings, in male genitalia the valvae are widening with cut and rough apex. In Eospilarctia maciai, the forewingterminal streak from M₂ is straight, extending to termen at about a 45° angle, crossing vein M₁, narrow, with even edges. The costal fascia does not extend to apex of the medial cell. In the male genitalia valvae almost the same width as long, in middle slightly curved, tip of valva wide, oval, tegumen wide narrowing, saccus with well visible blunt tip, juxta “X” form top and bottom wide deep, sides slightly excavated; aedeagus straight longer than valva, at the tip in ventral side with visible bulge.

Male: Forewing length of holotype 26 mm, wingspan 54 mm; antennae strongly bipectinate; forewing veins yellow on brown background; wing pattern typical of genus. Yellow costal band extends from forewing basis to apical streak. Terminal streak from M₂ straight, direct to termen 35° angle, cross vein M1, narrow, with rough edges. Hindwing white yellow, with brown spots. Ventral wing pattern and color identical to upper side.

Female. Forewing length of paratype 27 mm; wingspan 55 mm; antennae weakly bipectinate; patches on hindwings very small; other morphological feature as in male.

Male genitalia (Plate 2: figs 10–12, Plate 7: figs 1–3). Uncus bulbous; valvae short, almost the same width as length; slight curvature in mid-ventral portion of valve with tip transversely cut; tegumen narrow; saccus slightly narrowing without visible blunt tip; juxta wide, rounded, top deeply excavated; aedeagus straight, longer than valva, at the tip curved nearly 90°, vesica with two subbasal diverticula, one of them twice as wide as the other; median diverticulum short with short spines.

Female genitalia. (Plate 8: figs 2, 3). Papilla analis massive; apophysis posterioris about two and half times shorter than apophysis anterioris; ductus short; bursa bisaccate, rounded; eighth abdominal sternum with lateral sclerites; dorsum sclerotised, simple.

Eospilarctia naumannisp.n.is known only from the Kachin region of northern Myanmar (Plate 9: figs 1, 2). The new species was collected in late May at elevations of 2200 to 3000 m in mountainous virgin mixed forest, with swampy and mossy meadows. The habitat dominated by various species of Alnus, Prunus, Quercus, Rhododendron, Abies, different species of small bamboos and other smaller shrubs and ferns. Specimens of the new species were attracted to light (pers. comm. S. Naumann).

The new species is named after Mr Stefan Naumann (Berlin, Germany), a renowned Saturniidae specialist.

Dubatolov, Kishida and Wang (2008) described Eospilarctia yuennanica guangdonga as a new subspecies and included imago and male genitalia images, however we rise this taxa to species status, Eospilarctia guangdonga stat. nov. The Eospilarctia guangdonga forewing length is 31 mm compared to 28mm for Eospilarctia yuennanica yuennanica. In Eospilarctia guangdonga male genitalia the uncus is cruciform, valvae are not dilatable, tips of valvae are excavated, the juxta has short lateral protrusions, and aedeagus is shorter and stouter.In Eospilarctia yuennanica yuennanica male genitalia the valvae widen without excision at dorsal side of the apex, the juxta have bigger lateral extensions, and aedeagus is longer and thinner.