TRIBE BOLETOBIINI
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Diomea lignicolora Walker 
Corsa lignicolora Walker, [1858] 1857, List Specimens lepid. Insects Colln Br. Mus., 13: 1101.
Zigera suvarnad[i]vipae Kobes, 1983, Heterocera Sumatrana, 2: 14, syn. n.


Diomea lignicolora


Diagnosis
. This species and eupsema Swinhoe are the largest in the genus and have a similar facies, the wings mostly uniform greenish brown, with only the paler marginal markings conspicuous, but much more irregular, not evenly curved in eupsema which also has a diagnostic dark brown triangle at the centre of the forewing costa, and fine greenish speckling over the basal half of the hindwing.

Taxonomic note. The spelling of the junior synonym in the original description varies, being suvarnadivipae in the main heading, but suvarnadvipae everywhere else. Yoshimoto (2001a) retained the two taxa as distinct species; the geographical ranges he gave for each overlapped, though he implicitly restricted that of lignicolora to the type locality of Sri Lanka. Their synonymy is proposed here, but further investigation of the situation is needed as suggested by Yoshimoto; males from Sri Lanka were not available for dissection.

Geographical range. Indian Subregion, China and Taiwan (Yoshimoto, 2001a), Thailand (VK), Sumatra, Borneo, Bali, Sulawesi.

Habitat preference. This is an uncommon species of lowland forest up to 300m.

Biology. The species was reared by Bell (MS) in India. The larva is cylindrical. The prolegs are short, those on A3 and A4 absent. The head is smoky black, with groups of tiny shining tubercles in the main areas, but no setae. The body has primary setae on chalazae but also a dense general covering of very short bristles. The body is smoky black, the spiracles velvety black. There is a longitudinal pattern of marbling all over, with touches of orange along the dorsum, strongest on T1 where it includes the chalazae. There is also a hint of a subspiracular orange line, and there is a small but conspicuous pale yellow spot just above the spiracle of A5.

The larvae live on the exterior of bracket fungus, feeding on corky material. Pupation is in a tight-fitting, ovoid cocoon of white silk, camouflaged with particles of substrate.

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