terior temporal;
that species is _G. incomptus_, which differs from _G. maculiferus_ in
having six or seven lower labials, instead of five, and in having the
edges of the ventrals dark, instead of a uniformly cream-colored belly.

The locality from which the specimen was obtained lies at an elevation
of 1630 meters on the southern slope of the Cordillera Volcanica. At
that elevation there is an interdigitation of arid tropical scrub forest
and pine-oak forest; probably _Geophis maculiferus_ inhabits the
pine-oak forest.

~Geophis nigrocinctus~ Duellman

_Geophis nigrocinctus_ Duellman, Occ. Pap. Mus. Zool. Univ.
Michigan, 605:1, May 29, 1959.--Dos Aguas, Michoacan,
Mexico.

Dos Aguas (3).

The three specimens comprising the type series of the species were found
beneath logs and in a stump in pine-oak forest at an elevation of 2100
meters. A discussion of the variation in these specimens and of
probable relationships of the species was given by Duellman (1959).
Floyd Downs spent several days at Dos Aguas in July, 1960; although he
found ten specimens of _Geophis incomptus_, no further specimens of _G.
nigrocinctus_ were obtained.

~Geophis petersi~ Boulenger

_Geophis petersii_ Boulenger, Catalogue Snakes... British
Museum, 2:321, September 23, 1894.--Mexico City. Type
locality restricted to Patzcuaro, Michoacan, Mexico, by
Smith and Taylor (1950a:335).

Cheran; Coalcoman; Morelia; Patzcuaro (6).

This seems to be the most widespread species of _Geophis_ in Michoacan.
It has been found at elevations between 950 and 2350 meters, chiefly in
pine or pine-oak forest. Boulenger (1894:321) described _Geophis
petersi_ from a specimen stated to be from Mexico City, a locality which
probably is in error. The only localities from which the species is
definitely known are those listed in this account.

Three males and five females from the Mexican Plateau and the Cordillera
Volcanica have respectively 140-144 (141.7) and 143-151 (146.0) ventrals
and 39-41 (40.0) and 29-35 (33.2) caudals. All have dorsal scales in 15
rows, 1 postocular, no anterior temporal, and a relatively small
triangular supraocular. The specimen from Coalcoman (UMMZ 104698) was
referred to _Geophis nasalis_ by Peters (1954:22). This specimen is
abnormal in several characters; in five places there is a fusion and
separation of the vertebral and paravertebral scale rows, producing a
change from 17 to