Western Lynx Spider (Oxyopes scalaris) - Female guarding egg sac
The spider has black spines all over each leg and yellow joints. The abdomen has two small white and black stripes that are near the base near the thorax.
Lynx spider is the common name for any member of the family Oxyopidae. Most species make little use of webs, instead spending their lives as hunting spiders on plants. Many species frequent flowers in particular, ambushing pollinators, much as crab spiders do. They tend to tolerate members of their own species more than most spiders do, and at least one species has been identified as exhibiting social behaviour.