The first two pictures are of a Great Basin Whiptail (Cnemidophorus tigris), I believe. These guys were everywhere throughout the valley.
The last two pictures are of a Long-nosed Leopard Lizard (Gambelia wislizenii), I believe. The whiptail looks like it has a longer nose, but common names can be like that. I only found one of these guys. More information can be found here.
Perhaps it just has a long nose, relative to other leopard lizards.
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