These are spot-winged gliders, which, like their close relative the wandering glider, fly nearly continuously and range widely.   Spot-wings are quite similar to wandering gliders, but true to their name, they have a small dark spot in the inner edge of the hindwing, visible in some of these photos.  Males have notably red eyes as can be seen well in the close-up below at right. .  The one in flight was patrolling a small pond and the others were resting in nearby shrubs at the San Jacinto Wildlife Area, near Riverside, or in the Imperial Valley (both in southern California).