We had them at our villa and it turned out that there was a lift station in front of the villa wall on Hillsborough that was leaking. We had two drains on either side of the yard where these bugs were coming from. We tried everything to get rid of then including inside and outside bug zappers to no avail. When they fixed the lift station to include pouring a concrete mixture as in fixing a sink hole, the problem was resolved.Good Luck!
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