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