Although I think the Howell and Webb is the best available, in practice I found it difficult to use and, in the case of the Orioles, pretty hopeless. This, however, may be a reflection on me rather than the book. The Yucatan is a fabulous place though.
Phil
......I have sample pages of the plates and text for each of the books noted above on a web page dedicated to bird books of Mexico. You can see those at this link...
http://sites.google.com/site/avianreview/Home/review-content/Mexico#regional
....
Jack
Thanks to all of you for some great advice. I like the Belize book idea and I have a NA field guide I'll take also. I love collecting field guides so any excuse to buy a few more including Howell and Webb ;-)
Davis was a splitter and name-changer. At least, at the time the book came out, there were all too many species and names one did not find anywhere else in the FGs.