Coragyps atratus Oct. 10 With respect to Coragyps, the exact reverse of statements under Cathartes apply. Oct. 12 Observed in decreasing numbers as we progressed into the mountains from Mazatlán. The last was seen by Starker Leopold at Santa Lucía, at approximately 3600 feet. Oct. 31 Pitahaya, 40 km. SE Empalme, 100 feet, Sonora. Not common, but regular occurrence locally, judging by the last four days' observations.