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Thyas javanica Gaede
Dermaleipa javanica Gaede, 1917, Stettin. ent. Ztg, 78: 199.
Dermaleipa joiceyi Prout, 1924, Bull. Hill Mus. Witley, 1: 438.
Dermaleipa javanica defasciata Gaede, 1938, Gross-Schmett. Erde, 11: 471.
Lagoptera javanica acaerulea Holloway, 1976: 29.
Lagoptera javanica Gaede; Kobes, 1985: 31.

Thyas javanica

. The forewing facies is similar to that of congeners, but the hindwing is distinctive, being brown with a pale yellow border; the abdomen is dorsally brown but otherwise yellow. Typically the brown of the hindwing is crossed but not divided by a pale blue band, but this is weak to absent in the Bornean subspecies.

Taxonomic note. Poole (1989) retained joiceyi as a distinct species, but this is unjustified. The name defasciata Gaede has priority over acaerulea Holloway for the Bornean race, syn. n. A Bornean male dissected had slightly more rounded valve apices than one from Sumatra, and also a more undulating distal margin to the transverse saccular ridge. The genitalia have a flexed uncus, lateral lobes to the tegumen and ornamentation to the valves similar to those of juno.

Geographical range. Sumatra, Java, Bali, Peninsular Malaysia; Borneo (ssp. defasciata Gaede).

Habitat preference. Records are from the lowlands to 2600m, but the species is most frequent between 1000m and 2000m.

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