Cassin's Sparrow (Aimophila cassinii) was first reported in Wyoming on 8 June 1978 near Columbine, northeastern Natrona County, in the central part of the state (Faanes et al. 1979). Another was reported in 1989 east of Glendo Reservoir in Platte County (Bill Hayes, pers. comm.). On 28 June 1990, William Howe of the U.S. Fish and Wildlife Service found four singing males east of Torrington in Goshen County, near the Nebraska border (Ritter 1990; Kingery 1990; Scott 1993). Singing males were reported annually from the same area from 1991 (Ritter 1991; Kingery 1991) through 1994 (O.K. Scott, in litt.).