Nephelomilta ferruginea Volynkin & Černý, 2018

Volynkin, Anton V. & Černý, Karel, 2018, Revision of the genus Nephelomilta Hampson, 1900, with descriptions of twelve new species and two new subspecies (Lepidoptera, Erebidae, Arctiinae), Zootaxa 4472 (3), pp. 401-451 : 423-424

Nephelomilta ferruginea Volynkin & Černý , sp. nov.

( Figs. 80, 81 , 123, 124 , 147 )

Type material. Holotype ( Figs. 80 , 123 ): ♂, “ Indonesia, N Sumatra, Berastagi, Mt. Sibayak, 1500 m, 10.I.1994, leg. Karel Černý”, slide AV2549 ♂ (Coll. NHMUK, ex coll. CKC).

Paratypes: 1 ♀, Sumatra, W Dairi, 1150 m, 7.III.1981, Dr. Diehl leg., slide AV2550 ♀ Volynkin ( Coll. NHMUK, ex coll. CKC); 3 ♂, 1 ♀ , Indonesia, North Sumatra, 15 km NE Prapat, HW 4, 1150 m, 3–6.I.1994, leg. Karel Černý, slide AV2663 ♀ Volynkin ( Coll. CKC); 1 ♂ , Indonesia, Sumatra, Dairi, 1000 [m], 28.XII.1980, [leg.] Dr. Diehl, slide AV4146 ♂ Volynkin ( Coll. CKC); 1 ♂ , Indonesia, N Sumatra, Pematang Siantar, HW II, 8.XI.1986, leg. E. Diehl, slide AV4142 ♂ Volynkin ( Coll. CKC); 1 ♂, N Sumatra, Simelungun, Prapat, HW 3, 20.VIII.1983, Dr. Diehl leg., slide MWM 3301 (Coll. MWM/ ZSM).

Diagnosis. Length of forewing is 10–10.5 mm in males and 12 mm in females. Nephelomilta ferruginea sp. nov. differs externally from N. chalcedona in the rusty-brown area from the antemedial line to the outer wing margin and the presence of the dark dash in the apical white area of the forewing. The male genitalia of N. ferruginea sp. nov. differ clearly from those of N. chalcedona in the significantly smaller, poorly developed apical costal lobe, the absence of a basal dentation of the costa, the nuch smaller distal membranous lobe of the valve, and the slightly smaller spines on the distal diverticulum of the aedeagus vesica. The male genitalia of N. ferruginea sp. nov. also resemble those of N. diehli sp. nov., but can be distinguished in the broader valve, the less developed medial costal angle, the significantly smaller apical costal lobe, the broader ventral costal plate, the significantly shorter ampulla, which is lobe-like, and has two small dens on its ventral surface (whereas in N. diehli sp. nov. the ampulla is elongated, trigonal), the slightly longer subapical saccular process, the significantly longer and narrower aedeagus, the larger and more heavily sclerotized carinal plate, the much narrower medial and distal diverticula of the vesica, and the ansence of a subbasal diverticulum. The female genitalia of N. ferruginea sp. nov. differ from those of N. chalcedona in the shorter and significantly broader antevaginal plate, the broader ostium bursae, the slightly broader ductus bursae, the broader cluster of spinules in the medial section of the corpus bursae, and the slightly smaller signum.

Distribution. Endemic to Sumatra Island ( Indonesia).

Etymology. ‘Ferrugineus’ is ‘ferruginous’ in Latin, the species name refers to its rusty-brown forewing coloration.

Figures

FIGURES 71–83. Nephelomilta Spp.: ADULTS. 71, N. hortensis hortensis, paratype ♀, N Thailand (CKC); 72, N. hortensis fansipana, holotype ♂, N Vietnam (MWM/ZSM); 73, N. h. fansipana, paratype ♂, N Vietnam (MWM/ZSM); 74, N. h. fansipana, paratype ♀, N Vietnam (MWM/ZSM); 75, N. melli, holotype ♂, China, Jiangxi/Fujian border (MWM/ZSM); 76, N. melli, paratype ♂, China, Jiangxi/Fujian border (MWM/ZSM); 77, N. melli, pARAType ♂, ChINA, [ANhUI, QUIANShAN MTS.] (ZMB); 78, N. chalcedona, holotype ♂, SW Thailand (©NHMUK); 79, N. chalcedona, paratype ♀, W Thailand (CKC); 80, N. ferruginea, holotype ♂, Sumatra (©NHMUK); 81, N. ferruginea, paratype ♀, Sumatra (CKC); 82, N. diehli, hOLOType ♂, SUmATRA (MWM/ZSM); 83, N. diehli, pARAType ♂, SUmATRA (CKC).

FIGURES 123–125. Nephelomilta Spp.: mALe geNITALIA. 123, N. ferruginea, hOLOType, SUmATRA, SLIDe AV2549 VOLyNKIN (©NHMUK); 124, N. ferruginea, pARAType, SUmATRA, SLIDe AV4142 VOLyNKIN; 125, N. diehli, hOLOType, SUmATRA, SLIDe AV2663 VOLyNKIN.

FIGURES 142–147. Nephelomilta Spp.: femALe geNITALIA. 142, N. angkorensis, CAmbODIA, SLIDe MWM 31640 VOLyNKIN; 143, N. pusilla, TAIwAN, SLIDe MWM 31636 VOLyNKIN; 144, N. hortensis hortensis, pARAType, N ThAILAND, SLIDe AV2855 VOLyNKIN; 145, N. hortensis fansipana, pARAType, N VIeTNAm, SLIDe ZSM ARCT. 38/2017 VOLyNKIN; 146, N. chalcedona, W ThAILAND, SLIDe AV4139 VOLyNKIN; 147, N. ferruginea, pARAType, SUmATRA, SLIDe AV2550 VOLyNKIN.