Miscellaneous Genera IV 
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Thalatta Walker

Type species: precedens Walker, Indian Subregion.

The forewings in this genus are variegated dark brown and grey, sometimes with a subbasal white patch and sometimes with a postmedial straight fascia. They are shaped as in the Scoliopterygini and genera such as
Hyperlopha Hampson, but the species have male genitalia that distinguish the genus from both of these. Kobes (1983, Heterocera Sumatrana 2: 9-13) treated the three Sundanian species under Anomis, as the only described member of the trio, T. holortha Hampson comb. n., was already assigned to that genus. However, the three species have some or all the definitive features of Thalatta and are therefore transferred to this genus. This misplacement of Thalatta species in Anomis may have led Fibiger (2003) to place the genus as a synonym of Anomis. This is not supported here for the reasons given.

In the male abdomen the eighth sternite and tergite usually have apodemes; the tergite is often narrowed, and the sternite bears a slight pair of coremata in
T. argentipuncta Kobes comb. n.. The genitalia have the uncus long and hooked but there is no scaphium. The juxta is an inverted U shape. The valves are elongate, parallel-sided except for a rounded apex. In most species they have corematous structures basally that bear hair-pencils. The aedeagus is usually straight, short, and the vesica short and broad with several diverticula that are scobinate or bear clumps of spines.

In the female genitalia (prapata Kobes; Peninsular Malaysia, Fig 529), the ostium is between the seventh and eighth segments; the seventh sternite is moderately reduced. The ductus bursae is very short, fluted, but unsclerotised. The corpus bursae is large, ovate, scobinate and slightly corrugated.

The genus is restricted to the Indian Subregion, South-east Asia and Sundaland; there is an undescribed species from Sulawesi. In addition to the species above, T. prapata Kobes comb. n. (Sumatra, Peninsular Malaysia) should be transferred to the genus.

The biology of the type species and
fasciosa Moore (India) was described by Gardner (1947), and Bell (MS) described that of the former. The larva has the prolegs on A3 much reduced, and the developed ones have four external setae rather than the usual three, a feature shared with Erebus, Spirama and Bamra. The ventrum of the type species has a central black patch on each of segments A1-6. The setae are relatively long, arising from chalazae that can form white spots. Pupation is within a cocoon in folded leaves or in the soil, and the pupa lacks a bloom.

The few recorded larval host plants are in the Malpighiaceae (Aspidopterys and Hiptage) and Combretaceae (Combretum).

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