Miscellaneous Genera IV 
View Image Gallery of Miscellaneous Genera IV

Chilkasa falcata Swinhoe
Chilkasa falcata Swinhoe, 1885, Proc. zool. Soc. Lond., 1885: 854.
Pleurona perhamata Hampson, 1894, Fauna Br. India, Moths, 2: 549.
Acygonia difformis Roepke, 1948, Tijdschr. Ent., 89: 226.
Chilkasa falcata Swinhoe; Holloway, 1976: 38.

Chilkasa falcata Chilkasa falcata

. There is strong sexual dimorphism but the sexes share distinctly falcate forewings and darker postmedial fasciae that divide off the distal third of all wings. The male has the forewing apex more produced but less falcate and the secondary angle of the margin is reduced relative to that of the female. The hindwing margin is angled in the female, but not in the male. The female is a uniform brownish grey whereas the male is paler than this basal to the fasciae and darker distal to them. The male forelegs are strikingly tufted with pale yellow and brownish scales.

Taxonomic note. Poole (1989) used perhamata as the valid name for this species on the grounds that it was a replacement name for a secondary homonym proposed before 1961 (Code of Zoological Nomenclature edn. 4, Article 59.3), and should therefore stand even if the relevant taxa cease to be considered congeneric. However, this Article also indicates that the junior homonym should be retained (in the interests of stability) if the replacement name ‘is not in use’. Hampson’s personal copy of his 1894 publication, now in BMNH, is heavily annotated by him and indicates that he regarded the synonymy of Chilkasa with Pleurona Walker as mistaken and that he considered the combination of Chilkasa falcata as valid. Subsequent usage (e.g. Nye, 1975) has favoured falcata as the name for this species and therefore this name is given precedence.

Geographical range. Indian Subregion, Thailand (VK), Peninsular Malaysia, Sumatra, Borneo, Philippines.

Habitat preference. The species has been recorded from forested localities from the lowlands to 1930m, but is far commoner in the montane part of this range (1000m and above). However, Chey (1994) recorded a number of specimens from lowland softwood plantations.

Biology. Gardner (1947) described the larva. It is green, with the prolegs on A3 and A4 strongly reduced, those on A4 slightly larger.

No details were given of the pupa, and the host plant was not identified.

<<Back <<Return to Content Page

Copyright © Southdene Sdn. Bhd. All rights reserved.