Revision of the family Metarbelidae (Lepidoptera) of the Oriental Region. VI. Genus Tearbela Yakovlev & Zolotuhin gen. nov. from the Bangladesh and Marcopoloia dea (Swinhoe, 1890) comb. nov.

In the sixth part of the revision of the Asian Metarbelidae we describe a new monotypic genus, Tearbela Yakovlev & Zolotuhin, gen. nov. (type species, by original designation: Arbela theivora Hampson, 1910). Tearbela theivora (Hampson, 1910) comb. nov. and Marcopoloia dea (Swinhoe, 1890) comb. nov. are established and redescribed.


Introduction
Arbela theivora Hampson, 1910 was described on the specimens collected on tea plants and mango by C.B. Antram, entomologist of the Indian Tea Association (Hampson 1910). Examining the morphology of A. theivora males, we found an apomorphic feature which made it necessary to isolate a new genus.
Arbela ? dea Swinhoe, 1890 was described on a unique specimen from Rangoon with a note: "A very curios little insect; allied to nothing I know of. Undoubtedly of the family Cossidae, of an undescribed genus near Arbela, which I leave to be described when more specimens are forthcoming" (Swinhoe 1890). Examining the holotype genitalia, we established the affiliation of this little studied species to the genus Marcopoloia Yakovlev & Zolotuhin, 2021 (type species, by original designation -Arbela discipuncta Wileman, 1915), previously described by us.

Material and methods
The materials for the study were the adult Metarbelidae specimens deposited in the National Museum of Natural History (NHMUK). The male and female genitalia were mounted in euparal on slides following Lafontaine and Mikkola (1987) and examined with an Olympus SZX16 microscope. The images were taken with the digital camera CMOS 20.7 megapixels and processed using Corel Photo-Paint 2017 software.
Female. Length of fore wing 10-11 mm. Antenna simple, not pectinate. Body gracile. Abdomen with bundle of long scales apically. Fore wing wide, dark-brown, almost without pattern. Hind wing dark-brown. Fringe dark-brown, unicolorous. Genitalia not examined.
Diagnosis. The apomorphic feature of the new genus is the rectangular harpe on the saccular edge of the valve. The new genus is most close to two Metarbelidae genera: Orgyarbela Yakovlev & Zolotuhin, 2020 (type species -Arbela millemaculata Hampson, 1897, by original designation) and Micrarbela Yakovlev & Zolotuhin, 2021 (type species -Arbela minima Hampson, 1910, by original designation) (Yakovlev & Zolotuhin 2020, 2021a. From them it clearly differs in the male genital structure: -from Orgyarbelain the longer, elongated uncus, and in the rectangular harpe on the saccular edge of the valve; -from Micrarbelain the clearly expressed notch on the uncus apically.
Biology. "Bores in the bark of Tea and smaller branches of the Mango…" (Hampson 1910).

Redescription.
Male fore wing with poorly expressed darkened portion discally; female fore wing with poorly expressed pattern of strokes postdiscally and submarginally.

Female unknown.
Diagnosis. Judging from the characteristic features of the male genitalia, namelythe poorly extended uncus and the strongly swollen basal end of the phallus, the species belongs to the genus, recently described by us -Marcopoloia Yakovlev & Zolotuhin, 2021, which leads to the establishment of a new combination: Marcopoloia dea (Swinhoe, 1890) comb. n. Currently, the genus includes 6 species, distributed in southeastern Asia (Yakovlev & Zolotuhin, 2021b). Externally, M. dea is most close to M. leloi Yakovlev & Zolotuhin, 2021 (type locality: C. Vietnam, Gia Lai Prov., Kon Ka Kinh NP), from which it differs in the slightly extended apex of the uncus and in the less expressed harpe on the saccular edge of the valve.