2805 (1 photos) 2010-09-07 Ciudad de Oaxaca, Oaxaca (Oax), Mexico
The red bill and the overall gray look are characteristic.
Endemic
2806 (8 photos) 2010-09-07 Ciudad de Oaxaca, Oaxaca (Oax), Mexico
Different birds in this series. Photo 4 with the mostly dark bill must be a young bird. The rest of the photos look like an adult male with the dark corners to the tail.
Endemic
2804 (4 photos) 2018-04-12 Teotitlán del Valle, Oaxaca (Oax), Mexico
Not so easy to see characteristics here, but still. The red bill, the grayish front and the broad tail say it a species of this genus, very much like Broad-billed Hummingbird, except that both sexes are overall grayish and dusty green like the female Broad-billed. Endemic centered in and around Oaxaca.