Very fine image of the blue mud dauber, though, Chalybion californicum. Think about it: why would a 'cricket hunter' be after a spider?:-) I know, the obvious is often missed in the heat of the moment. Thank you much for sharing this photo. Try looking for Chlorion around railroad tracks, as they tend to search for crickets there, and nest in the sandy beds surrounding the tracks. I've had the best luck when the surrounding "habitat" was scrubby thickets of sumac.