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Thysanoptyx oblonga Butler stat. rev.  
Teulisna oblonga Butler, 1877, Trans. ent. Soc. London, 1877: 355.

Thysanoptyx oblonga
(x 1.30)

Fig.2C: Thysanoptyx tetragona Walker

See the generic description. The ground colour is more a pure pale creamy straw than in Teulisna species, and there is a black mark on the forewing costa at two thirds and a black tinge to the distal margin.

Taxonomic note. The male genitalia of oblonga indicate that it is distinct from the mainland Asian tetragona. The valves are more normal, with a strong distal saccular process; in tetragona the valves are more rounded, spined more densely round the margin, and the saccular process is reduced to a vestige distally. The aedeagus vesica has the most robust cornutus shorter, with the larger spines on it hooked rather than straight, and more conspicuously larger. There is only one other major zone of spining on the diverticula of the vesica, rather than two, and the spines are coarser. The diverticula are distinctly shorter. There is some variation in the Sundanian specimens dissected, with a Javan male (slide 4906) having a more rounded saccus and a Sumatran one (slide 876) having the accessory spines on the cornutus straighter.

Geographical range. Peninsular Malaysia, Sumatra, Java, Borneo.

Habitat preference. This is an uncommon species of lowland dipterocarp forest, mostly at low elevation, the highest specimen being from 600m.

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