Jumping spiders have good vision and use it for hunting and navigating.
They are capable of jumping from place to place, secured by a silk tether.
All jumping spiders have four pairs of eyes with very large anterior median eyes.

This is Artabrus erythrocephalus which is a fairly strong jumping spider with a characteristic appearance.
Males are about 11 mm long; females are slightly smaller.
Its abdomen is thin, conical and covered with fine white lines.
Males are usually brightly coloured and have a reddish-brown eye area.
The female has usually an ocher color but it can sometimes be green.
The male turns to intense green during his last moult.
This species is found in Singapore, and on Java, Bali and Krakatoa.

Dominik Hofer, a Swiss nature photographer and identifier on several animal website fora helped me identifying this species.

Ubud, Bali, Indonesia, 16 October 2011