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Iambia Walker

Type species: inferalis Walker, Africa.

Synonyms. Pariambia Hampson (type species aprepes Hampson, Sri Lanka, = pulla Swinhoe, India) syn. n.; Iambiodes Hampson (type species anomalis Hampson, India) syn. n.

This genus is best defined by features of the male and female genitalia; these are shared by the genera brought into synonymy. It contains species with a forewing pattern in which both orbicular and reniform stigmata are large, and there is a double, irregularly curved postmedial as in Callopistria Hubner; distal to the postmedial there is often a dark band that is broader anteriorly and crossed by fine pale lines to give a reticulate effect. In most taxa these markings are diffuse and obscure; the Bornean taxa show them most strongly.

In the male abdomen there are no basal hair pencils, but the apodemes of the basal sternite have short, deep interior flanges. There are no lateral rods or coremata on the eighth sternite. The uncus has a diagnostic pseuduncus, though this is replaced by a dorsal spine in one of the Bornean species and its sister-species. The valve is short, broad, with a simple harpe set centrally in most species but found on the ventral margin in the type species. The aedeagus vesica is globular, basally scobinate and with one or two distal clusters of much larger spines.

In the female genitalia the ductus is distally scobinate. The base of the bursa is more sclerotised than the rest, sometimes developed into an appendix bursae. The distal part of the bursa is incompletely ringed by two or more bands of small spines.

The spines in the female bursa and the form of the male uncus in particular, but also that of the valve and aedeagus vesica, serve to define the genus.

Bell (MS) described the biology of I. thwaitesii Moore in India. The larva is broadest at the middle, tapering to either end; the head is half the central width of the body. The head is green or yellow-green, with brown setae. The surface of the body is dull, with primary setae only, these set on small tubercles. The colour is light grass green. There are dorsal and lateral yellow lines, the former broken in the centre of each segment. There are much weaker, broken, supra- and subspiracular lines. The body setae are associated with white spots set in zones of green that lack a yellowish flush. Younger instars are darker green, with the lines and spots white. The first two pairs of prolegs are smaller than the rest, and the larva moves in a 'semilooper' manner.

The larvae live on the underside of leaves, feeding on young growth. Pupation is in the soil in a firm earthen cocoon closely lined on the inside with white silk.

The host-plant was Ziziphus (Rhamnaceae).

Bell also described the larva of I. pulla Swinhoe. This is another a semi- looper, with the prolegs on A3 considerably reduced. It is similar in appearance to the previous one, but the host-plant given was Justicia (Acanthaceae).

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