There is some resemblance in this genus to Simplicia. However, the white submarginals are broken into lunules except for the obtuse angle near the tornus of the hindwing. The interior fasciae are dark and dentate. The male antennae are fasciculate, and the foreleg of that sex has a fan or brush of scales over the tibial to tarsal zone as in Simplicia species such as S. robustalis Guenée (p. 112), which also has dentate, rather than linear, inner fasciae The second segment of the male labial palps is thick, densely scaled, but flattened in the vertical plane. The third segment is slender,with a slight scale tuft at its centre dorsally. The tibial sheath of the type species is just longer than the femur, and T1 is equal to it in length. The remaining tarsal segments are all short, variable in length (T3>T4>T2>T5). The new species described below has a foreleg with tarsal segments reduced to one; the femur has a bulge.
In the male abdomen, the eighth sternite shows vestiges of the framed corematous condition, but the apodemes of the tergite are well separated. The genitalia of the type species have a short triangular spur at the apex of the sacculus. The distal costal process seen in most Simplicia is absent. The saccus is narrow, almost digitate. The anellar tube is finely and densely spined. The juxta is rather square with a spine at each dorsal corner. The aedeagus vesica is large, somewhat convolute, with fine scobination only.
The female genitalia (purpuralis) have the ductus long, sclerotised, projecting into two small tongues flanking the ostium. The corpus bursae is an elongate pyriform, finely rugose to scobinate, this being intensified into a small scobinate signum at three-quarters.
The genus consists of the three species below. The Sumatran Lysimelia iodes Rothschild has similar broken white submarginals and is curated under Subsimplicia in the BMNH collection. The species was placed there without comment by Poole (1989). Lödl (1999e) provisionally placed iodes in Progonia. The placement by Poole represents the current situation, bringing the total of species to four.
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