Take a look at this comparison of flycatcher species.
http://viewingnaturewitheileen.blogspot.com/2014/07/social-flycatcher-boat-billed-flycatcher.html
Based upon the apparent size of its beak, this looks like a Great Kiskadee, Pitangus sulphuratus, but it could be a Boat-billed Flycatcher, Megarynchus pitangua. They have similar coloration and both live in your area.
http://neotropical.birds.cornell.edu/portal/species/overview?p_p_spp=477836
http://neotropical.birds.cornell.edu/portal/species/overview?p_p_spp=477996
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