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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.
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Thyas
javanica 
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Diagnosis.
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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