That is not a dew drop coming out of its butt. This little 1/2mm insect sat directly below the mouth of the ant, there are hundreds upon hundreds of them on the underside of leaves.
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This is (I believe) a red velvet ant or cow killer. It is actually a wingless wasp. Dasymutilla occidentalis
Have these insects been paralyzed from the ant's secretions? There are dozens of trees with bunches on them.
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Great shot of a very, very bizarre insect. Any idea what kind of bug? That mottled area behind the head looks like undeveloped wings. Maybe it just hatched and is resting on a leaf.