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This
tribe embraces a diverse assemblage of genera here basal abdominal tymbal organs
are always present in males, and these are always robust, broad, complex, with
no carinae except in Tortriciforma Hampson and Parasinna Kobes
where they are few, robust,
as in the
Camptolomini; there is great
diversity in the complexity of the tymbals (Holloway, 1998). The species are
generally robust, broad of thorax, and include all those where sound production
by males has actually been noted.
The forewing venation usually has the radial sector branching ((R2 (R3, R4))
R5), but R5 is independent in several genera, including Torticiforma
Hampson in the Bornean fauna, and distal to R2 in Dumatha Walker. A small
areole is present in Tympanistes Moore, but is absent in
other genera. Parasinna Kobes is unusual in that
R2 is also independent. The hindwing is typically quadrifine, though M3 and CuA1
are often stalked. In Tyana Walker the veins are reduced to a trifine
condition.
The group contains
genera with great diversity of facies and abdominal structure. The ovipositor
lobes are usually short, broad, often forming a setose ring. Hair pencils in the
male genitalia are usually found at the bases of the valves as in some
Ariolicini rather than on an expanded tegumen: they are seen strongly only in
Tympanistes, Tortriciforma and Parasinna though there is some
development also in Clethrophora Hampson and Dumatha. The ventral
part of the tegumen is not expanded on each side to any degree.
Host-plant records are few but include several from the Fagaceae as in the
Camptolomini.
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