Sundarosa HollowayGen. n.

Type species: rosipuncta Holloway comb. n. (Peninsular Malaysia, Sumatra, Bali).

This genus is established for six Narosa species described in The Moths of Borneo: Part 1. The group shares with Narosa argipuncta Hampson (Sri Lanka, S. India) a small, oblique white streak at the posterior angle of the cell and a larger than average marginal spot between veins CuA1 and CuA2 on the forewing, but the male genitalia are distinct, having an extremely  narrow valve with the saccular process modified into a ventral lobe, distinguishing it from other genera segregated from the broad concept of Narosa such as Caelestomorpha, Quasinarosa Solovyev & Witt and Tennya Solovyev & Witt (this includes propoliodes Holloway, described from Peninsular Malaysia) that also have a saccular process (lacking in typical Narosa) in the form of a strongly sclerotised spine. Unique features are a spined process at the base of, and central to the valve, and a slender spined process arising from the base of the valve costa. The aedeagus has an unusual setose, rod-like process that arises from it subbasally. Females are still unknown, but the larva was described and illustrated in Cock et al. (1987). It has a pair of distinct subdorsal ridges that are yellow, contrasting with the yellow-speckled green of the rest of the larva, which is louse-like, elliptical seen from above apart from acute processes where the subdorsal ridges meet the margin. These ridges do have a small pink mark in the centre of their extent as in that of the type species of Narosa, described in The Moths of Borneo: Part 1, but it is unclear whether this coincides with such a marked peak as is seen in Narosa. The host plants are Elaeis (oil palm; Palmae) and possibly Coffea (cocoon only; Rubiaceae).

As well as the type species, the genus consists of four from Borneo, S. lawaii Holloway comb. n., S. nagani Holloway comb. n., S. silati Holloway comb. n. and S. harmani Holloway comb. n., and one from Luzon in the Philippines, S. luzonica Holloway comb. n.