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Chadisra borneensis sp. n. 

Chadisra borneensis (holotype)

Chadisra borneensis (paratype)

23-24 mm. The facies is similar to that of basivacua but the exterior half of the forewing is less green, the interior half darker, the zone between the ‘step’ and the dorsum being pale fawn, the palest part of the forewing. The genitalia are very distinctive with broad triangular gnathal processes, transtillae that are deep, fused across the centre and bearing a pair of massive spines, valves with a thin dorsal triangular portion and a heavily sclerotised, squarish ventral portion, and a juxta extending dorsally in a long sclerotised strap, spined at the tip (detached and still associated with the aedeagus in the illustration). The Nepalese male mentioned earlier that is probably attributable to bipars or albobrunnea has the same broad tegumen and plate-like gnathal processes, but the latter are tridentate; the transtillal band has a central bifurcate process rather than two lateral ones; the juxta is similarly straplike but not apically scobinate; the valves have in addition a large, central, apically scobinate ampulla; the eighth tergite is similarly broadly and deeply bilobed but the stemite is trilobed rather than entire (an obtuse angle), with widely spaced lateral pouches centrally instead of two more closely adjacent subapical triangular flaps.

30 mm, resembling a large grey form of luzonensis but with the hindwing heavily suffused with dark grey. The genitalia are massive with a broad lobe followed by a pair of lobes posterior to the broad, membraneous ostium bursae. The two Himalayan taxa mentioned above also have short, unornamented bursae set in a broad complex array of folds and sclerotisations of the terminal sternites, though differing in detail; this is support for the contention that the Nepalese male is referable to one or other of them.

Holotype BRUNEI: 1618 m, Bukit Retak, montane forest, 25.4.81 (Lt. Col. M. G. Allen) BM notodontid slide 1101.

Paratypes. 1 as holotype, BM notodontid slide 1111; 1 BRUNEI: 30 - 60 m, Labi (Lt. Col. M. G. Allen); 2 SARAWAK: Gunong Mulu Nat. Park, R. G. S. Exped 1977-8 (J.D. Holloway et al.), Site 20, 150 m, kerangas, W. Melinau Gorge, and Site 23, 250 m, forest on limestone, W. Melinau Gorge.

Geographical range. Borneo.

Habitat preference. The few records have been from several types of lowland rain forest and from upper montane forest.

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