Miscellaneous Genera III
View Image Gallery of Miscellaneous Genera III

Delgamma Moore

Type species: calorifica Walker (= pangonia Guenée), Bangladesh, India, Sri Lanka.

This genus was revised by Zilli (2000a), who described a new species,
flaviae Zilli, that ranges from the N.E. Himalaya to Peninsular Malaysia, but is not so far known from the rest of Sundaland.

The male antennae are finely ciliate, and in
D. lilacea Bethune-Baker (New Guinea) are greatly swollen over the central part. The legs are in places tufted in males. The facies of all species is of various shades of brown, but always with more or less straight postmedial fasciae on both fore- and hindwings consisting of a fine double dark line with a pale centre. Distal to this the wing is a paler shade than just basal to it, but grades darker towards the margin. The submarginal may define or enclose darker brown markings within this marginal zone, which is often suffused with pale mauve; these dark brown markings are particularly well developed in the type species, with a large one on the forewing costa, but absent from flaviae.

The hindwing margin, when angled, is obtusely so at CuA2. The type species shows strong sexual dimorphism, males having an elongate, elliptical, scaleless zone in the medial section of the hindwing (M1 and M2 are bowed away from each other to enclose it) that probably covers an elongate band of androconia over the dorsal margin of the forewing underside when the insect is at rest (described in more detail by Zilli (2000a)). The male hindwings are reduced in area relative to those of the female.

The male abdomen has the eighth segment only slightly modified. The sternite is posteriorly very shallowly notched to render it slightly bilobed, whereas the tergite is rounded posteriorly and shallowly notched anteriorly. The genitalia have the uncus apically hooked, and a scaphium is present. The valves are narrow, simple, but with a prominent process arising from the base of the costa, curved or hooked in opposition to the valve. The juxta is a broad X-shape and probably a modification of the inverted ‘V’ type. The aedeagus vesica is complex with a few broad lobes and extensive scobination.

The female genitalia have the ostium between the eighth and seventh segments, the sternite of the latter somewhat reduced relative to the tergite, and distally bilobed in the type species. The ductus bursae is short and at least partially sclerotised. The corpus bursae is irregularly elongate, pyriform.

The biology of the type species is described below.

<<Back >>Forward <<Return to Content Page

Copyright © Southdene Sdn. Bhd. All rights reserved.