These are little 'flea beetles'---Order Coleoptera, Family Chrysomelidae, Genus - Altica. There are likely several species in your area; they may have a broader host range than what you might find in 'the literature.'

They're called 'flea beetles' because they jump like fleas when disturbed.

Chances are, you have some of their host plants around your house. Around my house at this time of year, Apache plume (Fallugia paradoxa) is a favorite; it's a native plant common to the desert SW and a member of the rose family.

The first adults of the season likely appeared some time in late May/early June. They laid their eggs, the eggs hatched, producing tiny black (not shiny) larvae that feasted on the foliage. Those pupated---probably on the soil around these hosts---and then, voile, the new adults appear---and often dissipate to new Apache plume shrubs elsewhere. They may or may not go through another big generation on the shrubs that produced them, particularly while it's so hot. At any rate, despite some defoliation, the plants go through another bloom cycle or two this year with the usual white blossoms, pink puffs of seeds (that germinate all over, BTW), and new leaves. These plants are quite resilient. 

I have records of these beetles, same genus---but different hosts---including grape, apple, pear and Oenothera. Those attacking evening primrose just about chew the tops off emerging plants in the fall---but they live and bloom like crazy the following spring.  

These are native insects at any rate; some live on native plants or adopt plants mostly in the same family. The side of your house may offer a little shade or moisture from irrigation.