R.K.Selador, 1952 66 Sept. 5 Rio Mezquital, 6850 ft., 12 mi. NE Durango, Durango, Mexico, a movement in the cotton wood above me. By use of the hand later I was able to locate an Otus asius (a a or ? found out later) perched on a large branch of the tree about 25 feet above the ground. Collected this individual. Later, heard owls [of this species?] calling in trees about 50 yds down the river. Stopped calling at 11:00 or thereabouts. At least two individuals were calling - one seemingly answering the other. - Weather mild with full moon and cloudless sky. Sept. 6 Rio Mezquital, Durango to San Pedro Riva, 4000 ft., 25 mi. SE Chihuahua, Chihuahua, Mexico. Drove straight through arriving at San Pedro Riva about 8:00 P.M. Camped at some spot as we did on July 20, 1952. No water in river this time, however. - [In driving through Durango (northern portion) I noted a number of patches of junipers along the highway and fairly good stands on several mountains. This is probably habitat of Chordeiles minor henryi. It is rather significant that the soil and rocks in these areas has a decided rust trest. The general aspect of the mountains is rust in hue. This doubtless account for the tawny coloration of C. mi. henryi: , Population of C. minor in Durango must be rather broken up in distribution. - Throughout northern Durango I could see little Cortes from the highway - An area of wide, scattered, low, dwarf