R. K. Selander, 1952 7 San Pedro River, 4000 ft., 25 mi. SE Chihuahua, Chihuahua, Mexico. July 20 Saw 2 (O7+?) Pyrrhuloxia in cottonwoods. 1 unidentified flycatcher (small). Texas nighthawks (10) flying at dusk. Bats along river fed at night, flying at least until 1:00 A.M., One brown tomber in shrubs near the river. Collected a small snake on dirt road beside cornfield at 10:00 P.M. Jays of several kinds seen along river and especially in mesquite and tuna, cactus stand located about 100 yds. from the river. July 21 Broke camp at 9:45. Weather fine and clear. Ravens flying over cornfield. Continued along Mexican Highway # 45 through farm land near Camargo. At Camargo, Dick, Toleno, and Selman turned back to return to Phoenix, Arizona. At 2 mi. 5 Delicas noted a shrike (Lanius ludovicianus) and a few great-tailed grackles near the highway. At Saucillo, noted barn swallows. Just south of Camargo saw crows and 2 Snea doves. Ravens and turkey cultures all along highway. At 39 mi. SSW Camargo, found a cactus wrenis (C. brunneicapillus) nest (See species account). Continued onto 35 mi. S El Entronque, 5000 ft., Durango where we camped at edge of deeply cut, dry river bed.