The Eugoa Walker group of genera
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Trischalis stomata sp. n.

Trischalis stomata(paratype)
(x 1.56)

, 7-8mm. The forewings are less heavily marked than in subaurana, the subcostal arcuate grey line being narrow, broken centrally, its basal part forming the upper arc of a series of three lines that depict what look like closed leaf stomata, one at the base of each forewing. The dorsal line is also arcuate, the central one straight, slightly closer to the dorsal one but not touching either; in subaurana it is closer to the dorsal one and fuses with it distally to form a loop. The enclosing arcuate marks join each other at their basal ends. The male genitalia in subaurana have the valves evenly curved and tapering to an acute apex, whereas in stomata the curvature is mainly subapical, the valve only tapers significantly beyond that point, and there is a small spur on the ventral margin where the curvature is most intense. The aedeagus is longer.

Holotype . SARAWAK: Gunong Mulu Nat. Park, R.G.S. Exped. 1977-8 (J.D. Holloway et al.), Site 22, April, W. Melinau Gorge, 150m. 421578, wet kerangas, BM arctiid slide 2771.

Paratypes (only unworn specimens are included): 4 as holotype but Site 20; 2, 1 (slide 2772) general data as holotype but Sites 11 (150m), 13 (500m) G. Mulu, mixed dipterocarp for.; 1 same general data but Site 14, Camp 2.5, Mulu, 1000m; 1 BRUNEI: 15m., Telisai, sandy heath forest and Gymnostoma, 29.12.1979 (R.. Fairclough).

Geographical range. Borneo, Singapore, Bali (slide 5049).

Habitat preference. More frequent than its congener, stomata is found in similar habitats over the same altitude range, but shows more preference for heath forest (kerangas).

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