Genus: Suastus Moore, 1881
Species: gremius Fabricius, 1798
Sub-species: gremius Fabricius, 1798
Wingspan of Adult Butterfly: 33-35mm
Caterpillar Local Host Plants: Cocos nucifera (Arecaceae; common name: Coconut), Rhapis excelsa (Arecaceae, common name: Lady Palm).
Physical Description of Adult Butterfly:
Above, the wings are brown with the forewing adorned with pale yellow hyaline spots in the cell-end and spaces 1b, 2, 3, 6, 7 and 8. The hindwing is unmarked. The tornal cilia are whitish. Beneath, the wings are greyish brown with the hindwing overlaid with buff scaling and featuring a number of moderately large and well defined black spots.
Field Observations of Butterfly Behaviour:
The Palm Bob is common in Singapore. Sightings are rather frequent in nature reserves and in urban parks and gardens. The adults are fast flyers and are skittish when disturbed. They have been observed to visit flowers and sunbathe in sunny weather, and to puddle on bird dropping.