co, it will perhaps be demonstrated that many of the
kinds now thought of as full species (including those discussed above)
are subspecies of a few wide-ranging species.

_Remarks._--The type locality of _G. aquilonaris_ is the small village
of Barranca at the bottom of the valley of the Rio Urique, several miles
south and west of the continental divide. The Urique Valley, known as
the Barranca del Cobre in the region south of Creel, is a deep canyon,
the walls of which slope abruptly from approximately 7300 to 3000 feet
and are dissected by deep side-canyons. Coniferous forest on the upper
rim of the canyon is replaced by scrub vegetation on the rocky walls and
by an arid tropical flora on the bottom.

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._

End of the Project Gutenberg EBook of A New Snake o