My friend has a rather baked bare earth area that is aswarm with a flying insect that looks like a black ant with wings. The burrows look like little ant hills and the bugs fly and land often - occasionally a real bee goes into the burrow loaded up with pollen. There is a total of an area about 10 feet by 10 feet covered with these little burrows that have a little hill of sand by the opening. Any idea what these are? Teressa inFerndale, WA