TRIBE LITHOSIINI
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Poliosia Hampson

Type species: muricolor Walker, Borneo.

Hampson (1900) identified no clearly definitive characters for this genus, but divided it into two sections. These are represented in Borneo by the typical muricolor group, including the type species, and the marginata Hampson group, consisting of larger species where the males have an elliptical androconial patch set in the angle between Sc and Rs on the hindwing (Fig. 10e; p. 297). All three species in the latter section occur in Borneo as well as muricolor and some related new species. Hampson included several further species from the Indian Subregion and one each from Africa and Australia in the genus, but the placement of these has not been investigated.


Fig 10e: Poliosia marginata Hampson

The muricolor group consists of small grey species with a narrowly paler forewing costa, short labial palps and a darker frons. The male genitalia have a rather rectangular uncus with a short apical spur and slight ventral angling subbasally. There is a variably bifid to quadrifid juxta, and the valves have the dorsal part ovate, with a strong, curved or apically angled process from the sacculus. The saccus is broad, shallow. The aedeagus vesica has a single small to very large cornutus. The female genitalia have rather square ovipositor lobes, a moderate ductus with an asymmetric, sclerotised diverticulum (muricolor) and a small, spherical bursa full of coarse spines.

The marginata group has the forewings deeper, more ovate, the facies pale brown to fawn. The male genitalia have a tapering uncus and a prominent saccus. The juxta is weak. The saccular process of the valves is strongly flexed but does not extend so far towards the apex as in the muricolor group. The aedeagus vesica is large, with two or three diverticula that bear elongate, serrate cornuti at their apices. No females have been located that can be assigned to this group with confidence.

No feature has been located to indicate that the muricolor and marginata groups form a monophyletic entity.

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