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Salticidae: Opisthoncus sp.? [Opisthoncus jumping spiders have large eyes and short stout legs. The first pair of legs have strong spines. The eyes are arranged in two rows and the first pair are large and forward facing. The usual body colours are grey, brown and black...http://www.ozanimals.com/Spider/Jumping-Spider/Opisthoncus/sp.html]
Large semi-urban yard/garden next to a disturbed patch of remnant forest.
Thanks again SheaEckert for the suggestion. I note that Opisthoncus spp. also occurs in New Guinea so I'm still investigating this.
I think it is this species because it was the only one I could find specific to Indonesia. :)