45 Mycteria americana. Oct. 4-6. Empalme, sea level, near Guaymas, Sonora. Large flocks observed each day near and along the shallow bay shore north of town. Daily flights suggested that at this time, at least, these birds were not migrating. Van Rossem (1945: 42) lists this species as a summer visitor from Guaymas, but without definite dates limiting seasonal occurrence. Oct. 30 Pitahaya, 40 km SE Empalme, 100 ft., Sonora. During period of Oct. 27-Nov. 4 on Laguna, only one individual, presumably a migrant, observed on this date.