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Euconosia obscuriventris sp. n. 
Conosia aspersa ab. obscuriventris Strand, 1922, Lep. Cat., 26: 853.

Euconosia obscuriventris
(x 1.32)

Euconosia obscuriventris
(x 1.32)

11-12mm, 15-16mm. In facies, the species is often suffused with dark brown scales irregularly over the forewing, especially in the female. It is distinguished from aspersa and xylinoides by genitalic characters. In the male, the hairy margin to the upper part of the valve is dense only at the apex; the aedeagus vesica is large relative to those of the other species, with a terminal cornutus that is slender (though broadly based) and appressed. The female has a narrow ductus bursae that lacks sclerotisation, and the corpus bursae has a smaller, spherical appendix bursae centrally and a single signum at its distal end.

Holotype SARAWAK: Gunong Mulu Nat. Park, R.G.S. Exped. 1977-8 (J.D. Holloway et al.), Site 8, February, Camp 1, Mulu, 150m, 385470, mixed dipt. for., MV-mainly canopy, BM arctiid slide 2790.

Paratypes:1 (slide 5109), 1 (slide 5112) as holotype; 1 data as holotype but Site 11, river, understorey, slide 5110; 1 (slide 5119) Baram, BORNEO (holotype of ab. obscuriventris).

Other material (not dissected): 3 as holotype, 1 Site 11; 1 Ulu Temburong Expedition 1978, BRUNEI, Base Camp, 300m, m.v. light, 9.x. 1978 (T. W. Harman).

Geographical range.
Borneo, Batu Is. (between Siberut and Nias, west of Sumatra).

Habitat preference. Bornean material is from dipterocarp forest on slopes at low elevation.

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