View Image Gallery of Tribe Nygmiini n.

Orvasca subnotata Walker comb. rev.
Orvasca subnotata Walker, 1865, List Specimens lepid. Insects Colln Br. Mus., 32: 502.
Euproctis polydorus Schintlmeister, 1994: 133, syn. n.

Orvasca subnotata

Both sexes resemble somewhat the female of Somena similis (See Somena similis Moore comb.n) and males of Nygmia atereta Collenette comb. n., but the forewing is paler with two distinct, fine, whitish fasciae crossing the brown area. The elongate valves of the male genitalia and the unusual bilobed sterigma of the female are also diagnostic.

Taxonomic note. The genitalia illustrated by Schintlmeister for polydorus (his fig 107) match those of subnotata, as do those of Sundanian females attributable to polydorus: the difference is in the hindwing, where Sundanian material is often extensively grey, though forms with a yellow hindwing do also occur. It is possible that specimens 5, 8 and 9 in Plate 6 of Schintlmeister are all subnotata, though identified as scintillans and similis (the latter referred to as limbata Butler in the text, but see below). The specimen identified as subnotata on his Plate 6: 43 is "Euproctis” wilemani Collenette, discussed on "Euproctis" wilemani Collenette. The true O. limbata Butler comb. n. (Indian Subregion) has facies similar to subnotata, but with a grey and white hindwing, and an apical patch on the forewing that tends to extend basally along the costa. The male genitalia are more similar to those of the next species: they are illustrated as subnotata by Kishida (1993).

Geographical range. Oriental tropics to Borneo and Sumatra.

Habitat preference. The species has been taken infrequently in lowland forest in recent surveys, but can attain pest levels.

Biology. The possibility that this species has been confused with others means that lists of host records need to be treated with some caution and may particularly overlap with those for Somena similis. No larval description has been located apart from those of Moore (1883), who may have confused Somena species and subnotata. Both his illustrations indicate the presence of tubercles on Al and A2, so these probably occur in subnotata.

Host records (Sevastopubo, 1940; Browne, 1968; Kuroko & Lewvanich, 1993; unpublished IIE records) include: Anacardium, Mangifera (Anacardiaceae); Cycas (Cycadaceae); Hevea (Euphorbiaceae); Acacia, Sesbania (Leguminosae); Areca (Palmae); Citrus (Rutaceae); Litchi, Nephelium (Sapindaceae); Sonneratia (Sonneratiaceae); Theobroma (Sterculiaceae).

<<Back >>Forward <<Return to Contents page

Copyright © Southdene Sdn. Bhd. All rights reserved.