Maguarachic (elevation approximately 5400 feet, longitude and latitude respectively, 108 degrees, 03 minutes W and 27 degrees, 50 minutes N) and Mojarachic (elevation approximately 7000 feet, longitude and latitude respectively, 108 degrees W and 27 degrees, 52 minutes N) are situated approximately three miles from each other and approximately 27 miles northwest of Creel. Maguarachic is given as "Mafuarachic" on the American Geographical Society map (NG 12, Baja California-Mexico, Prov. Ed., 1924). Mojarachic is not on any map of Chihuahua that I have examined.
The type and topotypic paratype were given to a member of the K.U. field party by a Mexican youth who had obtained them the previous night on the lower rocky slopes of the canyon. Both specimens were damaged by the collector piercing their heads with thorns, presumably to kill them. The type contained three oviducal eggs, each about four millimeters long. The stomachs of both specimens from Creel contained earthworms.
The presence of Geophis in this area suggests that the distribution of the genus is more or less continuous, on the western slope of the Sierra Madre Occidental, from Jalisco to southern Sonora.
I am grateful to Mr. Sydney Anderson and Mr. Ronald Pine for permission to use their field notes, to Dr. Hobart M. Smith for his examination of the specimens from Creel, to Mrs. Lorna Cordonnier for the drawings of the type, to Dr. Norman Hartweg for permitting me to study materials in his care and upon which he was making an independent study, and to Mr. Thomas M. Uzzell for locality data pertaining to the UMMZ paratypes.
Transmitted November 10, 1958.