White crab spider

this looks very much like the female Thomisus kitamurai, shown on Wikipedia.

Thomisus is a genus of crab spiders (family Thomisidae) with more than 100 species described. The genus includes species that vary widely in their ecology, but the best known crab spiders are those species that people call the flower crab spiders, because they are ambush predators that feed on insects visiting flowers. The flower crab spiders are the species for which the popular name was coined, because of their crab-like motion and their way of holding their front legs in an attitude reminiscent of a crab spreading its claws as a threat.

In most species females are four to ten mm long, with males two to seven mm. Many are brightly colored, usually matching the color of the flower in which they are waiting in ambush.
Source: Wikipedia
In this case, the flower it was on, was white.