Abstract
During 1951 and 1952 a study was conducted on types of larval habitat, larval and adult feeding, cocoon spinning, the emergence process and oviposition of Utah black flies. Most of the work was concentrated at six stations in City Creek Canyon and four stations in Red Butte Canyon. The data obtained at these stations were supplemented with additional observations, made thru 1955, in various localities throughout the state. Red Butte and City Creek Canyons are located on the western side of the Wasatch Mountains. Red Butte Canyon is directly east of Salt Lake City, and City Creek Canyon is approximately three miles northwest of Red Butte and north of the City.