This is a part of a small group of Eucerine males gathering nightly on a small, dead twig of a Salvia clevelandii. During the day they fly around rapidly, probably searching for females. At times they sip nectar from flowers on 'their' Sage (a Salvia clevelandii). By observation I learned, to my surprise, that the males pierce the base of the corolla in order to get at the nectar (like Carpenter Bees, 'nectar-robbing' without pollinating the flowers).
In the present image it is 'wake-up time', as the first rays of the morning sun warms this part of the garden.
The few females I've seen in my garden actually entered the flowers (though they may also have used the Cleveland Sage, I observed the females only on a couple of other Sages, as well as a Pelargonium.
According to Doug Yanega (Dept. of Entomology, Entomology Research Museum, UC Riverside, CA), these male gathering places may contain more than one species; here possibly Melissodes or Svastra.