Hello,
I saw this Myiarchus Flycatcher in Los Mochis, Sinaloa, Mexico on 6/15/23. The two expected Myiarchus species are Brown-crested & Nutting's. I think the beak is too small to be a Brown-crested, especially considering the location, where the "western" brown-crested, which has a bigger beak. Unfortunately, I did not hear this bird vocalize. I do not have much of an experience with either of these flycatchers, so I appreciate your input and expertise.