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Aegilia sundascribens sp. n.  
Stictoptera describens Walker; sensu Holloway, 1976: 19, and Barlow, 1982: 91.

Aegilia sundascribens

Aegilia describens
(f. atrimaculata)

Aegilia describens
(f. atrimaculata)

Aegilia sundascribens
(f. semilunaris

Aegilia sundascribens
(f. albosuffusa)

20-22mm. The species can only be distinguished externally from describens by the sinuous, rather than straight, whitish submarginal line at the forewing tornus, and even this character is not fully reliable. In the male genitalia the socii are relatively massive, the apex of the dorsal arm of the valve large, the basal process on the valve costa relatively small, and the harpe is a single, rather central process. The aedeagus vesica has a single row of slender spines that increase in size distad almost exponentially. The female genitalia are as in Fig. 183, the elongate, sinuous ductus and the small oval plate at the ostium being amongst the diagnostic characters.

The variation of the forewing facies in this and other species in the describens complex (excluding indescribens) appears to be similar with about half a dozen forms recognised, mostly named by Strand as aberrations of describens; several of the Strand holotypes, however, belong to other species of the complex as indicated. It is proposed here that these aberration names be applied throughout the complex to facilitate cross-reference of variation from one species to another (nomina collectiva).

The typical form (above) has no well defined forewing markings apart from the submarginal at the tornus.

Ab. atrifascia Strand (papuascribens) has dark brown patches: one apical, two discal, one central-dorsal, and one basal.

Ab. atrimaculata Strand (sundascribens) has a longitudinal, central, dark brown streak (below).

Ab. semilunaris Strand (sundascribens) has a large, dark brown crescent- shaped zone over the basal half (above).

Ab. patagiata Strand (sundascribens) (= describentis Strand) has the basal half of the forewing rich brown in the male and cream colour in the female (illustrated by Barlow, 1982, Plate 29:18).

Ab. xylinata Walker stat. n. has the forewings darker with oblique pale zones on either side of the submarginal.

Ab. albosuffusa Strand (sundascribens) has the forewing basal to the submarginal suffused grey in the male and white in the female (below).

Holotype BRUNEI: 1618m, Bukit Retak, montane forest, 25.4.1981 (Lt. Col. M.G. Allen) BM noctuid slide 11234.

Paratypes: 2, 1 BRUNEI, various localities (Allen), BM noctuid slides 11207, 11233, 11208.

Geographical range. Peninsular Malaysia, Sumatra, Borneo.

Habitat preference.
On G. Kinabalu the species was infrequent at 1000m and frequent at around 2000m. Records of Aegilia on the Mulu survey ranged from the lowlands to upper montane forest on the transects of both G. Mulu and G. Api; probably most were sundascribens but the majority of the specimens were discarded after a field count. Material from Brunei was taken in both lowland and upper montane forest.

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