Sceloporus magister, I think, from the description and photos on Arizona PARC. It says that some males can have a blue-green side marking on the belly, so this may also be the lizard I’ve been seeing scuttling under a tree as the walk back rejoins the wash.

I also saw a small, long, lizard with spots on the side and stripes down the back and a faint gloss to the skin; from the website, I think it’s a Tiger Whiptail, Aspidoscelis tigris.

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