This crab spider does not make a web, but sits in wait for its prey on a flower. When an insect visits, in search of nectar, it is jumped upon and killed. Here she (yes, it is a she, males are much smaller) choose a Tassel Hyacinth (Muscari comosum).
The Tassel Hyacinth is now in flower on roadsides and in meadows. It is a bulbous plant, like the hyacinths that grow in gardens. On the picture below you can see it has two kinds of flowers. Below are the purplish-brownish fertile flowers. The top of the plant is attractive to insects (and spiders) due to the strong blue color of the infertile flowers.