Loxosceles palma
Loxosceles palma is a species of venomous recluse spider in the family Sicariidae. It is native to Baja California, Mexico. The species name palma comes from the Latin word for palm, and was named as such after the palm canyons in both California, and Baja California. L. palma mainly inhabits deep canyons, such as the San Jacinto Mountains, in California. They tend to hide under rocks. References 

Sicariidae
Spiders described in 1980