Orchard Orbweaver, Leucauge venusta. In the last image the spider has a captured tick in it's web.

A green legged spider with a green, white, yellow and black abdomen hangs upside down in web.
A green legged spider with a green, white, yellow and black abdomen hangs upside down in web.
A green legged spider with white, yellow and black abdomen hangs upside down in web.
A green legged spider with white, yellow and black abdomen hangs upside down in web, it holds a captured tick.