Nephelomilta diehli Volynkin & Černý, 2018

Volynkin, Anton V., Dubatolov, Vladimir V., Huang, Si-Yao & Kishida, Yasunori, 2021, Two new species of the genus Nephelomilta Hampson (Lepidoptera: Erebidae Arctiinae) from China and Indonesia, Zootaxa 5004 (1), pp. 58-66 : 65

Nephelomilta diehli Volynkin & Černý, 2018

( Figs 8–10 , 18–20 )

Type material examined. Holotype ( Figs 8 , 19 ): male, “ Indonesia, N. Sumatra, 15 km NO [NE] Prapat, HW 4, 1150m, 3.–6.I.1994, leg. Karel Cerny [recte Černý]” / “Slide AV2663 ♂ A. Volynkin ”: ( MWM / ZSM, ex coll. CKC).

Paratypes. INDONESIA: 1 male, same data as for holotype ( CKC) ; 1 male, Indonesia, N Sumatra, 15 km NE Sipirok, 1350m, Lake Marsabut , 8.I.1994, gen. prep. No.: AV2662 (prepared by Volynkin) ( CKC) ; 1 male, Indonesia , Sumatra, Holzweg 3, 1987, Diehl leg. ( CKC) ; 2 males, N Sumatra, C Samosir, Toba lake, Partunghoan , 2.37 N 98.44 E, 1600 m, 20.IX.1991, secondary forest, Graul & Schintlmeister leg. [in German], gen. prep. Nos.: AV4144, AV4145 (prepared by Volynkin) ( CKC) .

Additional material examined. INDONESIA: 1 male, Borneo, Kalimantan Selatan, 1100m, 30 km E Kandangan, Regenwald [rainforest], 15 km NE Loksado, 3–22.IX.1997, Jakl leg., 2°52´S / 115°38´E, gen. prep. No.: MWM 37104 (prepared by Volynkin) ( MWM / ZSM) .

Remark. The specimen from southern Borneo Island ( Fig. 10 ) is somewhat smaller and has somewhat nar- rower forewing (the length and width ratio is 2.4:1 vs. 2.2: 1 in the Sumatran populations) with thinner pattern than the nominate populations from Sumatra. It also displays slight differences in the male genitalia ( Fig. 20 ) from the specimens from Sumatra ( Fig. 18, 19 ), viz. the somewhat narrower apical lobe of the costa, the somewhat narrower ampulla and the somewhat less elongate subbasal diverticulum of the vesica (ca. 1/4 of the phallus length vs. 1/2 of the phallus length in the Sumatran populations). Probably the population from Borneo represents a separated subspecies, but to describe it examination of additional materials is necessary.

Distribution. The species is known from the islands of Sumatra ( Indonesia) ( Volynkin & Černý 2018) and Borneo (Kalimantan Selatan Province of Indonesia, a new record).

Figures

FIGURES 1–10. Nephelomilta spp.: adults. Depositories of the specimens: 1 and 2 in SZMN; 3, 4, 8 and 10 in MWM/ZSM (3 and 8 ex CKC); 5 in RMNH; 6 in NHMUK (©The Trustees of NHMUK); 7 in MFN; 9 in CKC.

FIGURES 18–20. Nephelomilta diehli: male genitalia. Depositories of the specimens dissected: 18 and 20 in MWM/ZSM (18 ex CKC); 19 in CKC.