Agrisius orhanti Volynkin, Dubatolov & Kishida, 2018

Volynkin, Anton V., Dubatolov, Vladimir V. & Kishida, Yasunori, 2018, On the taxonomy of the genus Agrisius Walker, 1855, with descriptions of two new species from Vietnam and Laos (Lepidoptera, Erebidae, Arctiinae), Zootaxa 4459 (1), pp. 128-138 : 130-131

Agrisius orhanti Volynkin, Dubatolov & Kishida , sp. nov.

( Figs 7, 8 , 25 , 35 )

Type material. Holotype ( Figs 7 , 25 ): ♂, 17–28.VIII.2017, South Laos, Сhampasak prov., 27 km ENE of Pakse, near Tad Fane waterfall, N15°11'01.1'' E106°07'40.5'', 950 m, border of primary forest, A.V. Volynkin & M.S. Ivanova leg., slide AV3102 ♂ (Сoll. NHMUK).

Paratypes: 6 ♂, 7 ♀, same data as in the holotype, slides AV3102 ♂, AV4314 ♀ (Сolls СAV, NHMUK, SZMN).

Diagnosis. The new species ( Figs 7, 8 ) is externally similar to A. japonicus japonicus ( Figs 1, 2 ), A. japonicus dubatolovi ( Figs 5, 6 ) and A. leloii sp. nov. ( Figs 9, 10 ), but can be easily distinguished from them by its significantly darker hindwing, the darker forewing, and the presence of two additional black spots in the medial area between Сu bifurcation and vein A, which are the posterior parts of the antemedial and medial rows. The male genitalia of A. orhanti sp. nov. ( Fig. 25 ) are similar to those of A. japonicus ( Figs 21–24 ) and differ by the uncus structure: in A. orhanti sp. nov. the dorsal crest of the uncus is much smaller and trigonal, the apical-dorsal processes of the distal branches of the uncus are larger and have distal spinules thinner and assembled into a narrow bunch-shaped cluster, whereas in A. japonicus the dorsal crest of the uncus is much larger, trapezoidal with rounded corners and a rounded concavity distally, the apical-dorsal processes of the distal branches of the uncus are shorter and have distal spinules more robust and evenly distributed along the distal surface. The female genitalia of A. orhanti sp. nov. ( Fig. 35 ) differ from those of A. japonicus ( Figs 33, 34 ) by the significantly shorter and narrower signa.

Description. Adult ( Figs 7, 8 ). Forewing length 22–23 mm in males and 26–27 mm in females. Forewing narrow with elongated towards apex, its ground color dark brown. Forewing pattern consists of series and rows of blackish spots in inner part of wing: wing base with one small spot; subbasal row straight, consists of three spots; antemedial row S-like curved, consists of six spots of different size; medial row V-like curved, consists of five dots, does not reach anal area of wing; postmedial row consists of eight-nine spots of different size and strongly looplike curved on cell. In forewing outer area, veins blackish brown, alternating with indistinct diffuse darker strokes between veins; cilia dark brown. Hindwings much darker than forewing, dark brownish-grey with darker veins; cilia dark brownish-grey. Male genitalia ( Fig. 25 ). Uncus consists of broad and long basal plate with trigonal dorsal crest positioned medially, and two distal branches, which have finger-shaped apical-dorsal processes armed with bunch-shaped clusters of spinules basally; tegumen moderately sclerotized, penicular lobes large, trigonal, with coremata; tuba analis broad, with heavily scleroized, plate-like subscaphium; juxta large, heavily sclerotized, hood-like; vinculum heavily sclerotized, V-shaped. Valve lobe-like, membranous, distally broadened; costa weakly sclerotized, short and broad, with ventrally directed cuneal extension; sacculus short and narrow, with one heavily sclerotized curved extension. Aedeagus small and narrow, with long and curved coecum; vesica curved ventrally at base, with distally directed narrow and short subbasal diverticulum. Female genitalia ( Fig. 35 ). Ovipositor short, conical; papillae anales broad, with weak setae; VIII abdominal segment moderately sclerotized; apophyses short and broad, apophyses posteriores broader and longer than apophyses posteriores. Ostium bursae narrow. Ductus bursae long, narrow, membranous, with short cluster of weak sclerotization in its posterior third; corpus bursae extremely long, membranous, drop-like, with two long and narrow, drop-shaped signa, which consist of two plates each and are spiked.

Distribution. The species is currently known from South Laos (Сhampasak Province).

Etymology. The species name is dedicated to Georges E.R.J. Orhant (Paris, France), a well-known lepidopterist, who described three taxa in the genus Agrisius .

Figures

FIGURES 1–10. Agrisius spp.: adults. 1, A. japonicus japonicus, ♂, Japan (©NHMUK); 2, A. japonicus japonicus, hOlOtype ♀, Japan (©NHMUK); 3, A. japonicus albida, paratype ♂, China, Jiangsu (ZFMK); 4, A. japonicus albida, paratype ♀, China, Jiangsu (ZFMK); 5, A. japonicus dubatolovi, holotype ♂, Thailand (after Orhant 2012); 6, A. japonicus dubatolovi, ♂, N VietnaM (SZMN); 7, A. orhanti, holotype ♂, S Laos (©NHMUK); 8, A. orhanti, paratype ♀, S Laos (CAV); 9, A. leloii, holotype ♂, C Vietnam (©NHMUK); 10, A. leloii, paratype ♀, C VietnaM (CAV).

FIGURES 21–26. Agrisius spp.: Male genitalia. 21, A. japonicus japonicus, S KOrea, slide YK2801 Kishida, re-MOunted by VOlynkin; 22, A. japonicus albida, paratype, China, Jiangsu, slide AV1882; 23, A. japonicus dubatolovi, hOlOtype, Thailand (aFter Orhant 2012); 24, A. japonicus dubatolovi, N VietnaM, slide AV1690 (ex prep. DubatOlOV); 25, A. orhanti, hOlOtype, S LaOs, slide AV3102; 26, A. leloii, paratype, C VietnaM, slide AV1777.

FIGURES 33–41. Agrisius spp.: FeMale genitalia. 33, A. japonicus japonicus, Japan, slide AV1676; 34, A. japonicus albida, paratype, E China, slide AV1887; 35, A. orhanti, paratype, S LaOs, slide AV4314; 36, A. leloii, paratype, N VietnaM, slide AV1775; 37, A. guttivitta, Central Nepal, slide AV1677; 38, A. similis, N VietnaM, slide AV1669; 39, A. aestivalis, paratype, China, GuangdOng, slide AV1708; 40, A. vernalis, paratype, China, GuangdOng, slide AV1670; 41, A. excellens, paratype, NE LaOs, slide AV1675.