Butterflies of Thailand, Malaysia & Borneo
Velvet Bob
Koruthaialos rubecula  PLÖTZ, 1882
subfamily - HESPERIINAE
Tribe -

Koruthaialos rubecula rubecula, Ulu Gerok, West Malaysia © Adrian Hoskins
The genus Koruthaialos comprises of 4 species, all of which are endemic to the Oriental region. In West Malaysia there are 2 species - rubecula and sindu. In sindu the orange band extends as far as the leading edge of the forewings.
Koruthaialos rubecula is found in Bangladesh, Myanmar, Thailand, Laos, Vietnam, the Philippines, and south through the Malay archipelago to Sumatra, Borneo, Sulawesi and Bali.
This is a common species found in disturbed forested habitats including roadsides, quarries, parks, gardens and forest glades, at elevations between sea level and about 500 metres. It often shares its habitats with K. sindu, which is the more abundant of the 2 species.
The early stages of all Koruthaialos species appear to be unrecorded. It is almost certain, based on related genera, that the eggs will be dome-shaped and laid singly on grasses. It is also fairly safe to assume that the larva will be green, and will have thin dark lines along it's back and sides. As with other Hesperiines it will feed nocturnally, and spend it's days hidden inside a shelter which has been constructed by rolling a grass blade into a tube, held together with strands of silk. The pupa will be formed within a similar construction.
Adult behaviour
Unusually for a Hesperiine, the adults commonly bask with the wings almost fully open, although they also adopt the more usual position in which the forewings are held at a 45° angle, and the hindwings held flat.


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