The Eugoa Walker group of genera
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Eugoa alticrassa sp. n. 

Eugoa alticrassa (holotype) (x 1.56)

, 8-10mm. Externally this species is very similar to crassa, but usually has a definite antemedial fascia (obscure in crassa). The two can only be separated reliably on genitalic characters. Males of both have the valve costa angled, but this angle is more acute, more distal in alticrassa. In the aedeagus vesica crassa has an elongate comb of spines whereas alticrassa has a much smaller clump. In the female, there are much longer spines projecting posteriorly on each side of the ostium. Only dissected material is included in the type series.

Holotype SARAWAK: Gunong Mulu Nat. Park, R.G.S. Exped. 1977-8 (J.D. Holloway et al.), Site 15, February, Camp 2.5, Mulu, 1000m. 413461, lower montane f., BM arctiid slide 2769.

Paratypes: 1 (slide 2776) as holotype; 1 (slide 5256 ) same general data as holotype but Site 25, April, G. Api, 900m. 427550, lower montane forest; 1 (slide 2753), 1 (slide 5257) BRUNEI: 15m, Telisai, sandy heath forest and Gymnostoma, 3.2.1979 (Lt. Col. M.G. Allen); 1 (slide 5087) BRUNEI: Telisai, Gymno[stoma] scrub, 10m, iv.91 (I.Gauld).

Geographical range. Borneo.

Habitat preference. Most material has been taken in upper montane forest at 1000m on G. Mulu and at 900m on G. Api, but the species occurs more rarely in the lowlands, particularly in dry heath forest.

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